Omega Engineering Thermometer CYD201 and CYD208 User Manual
ꢀꢁꢂꢃꢄꢅꢀꢃꢆꢇ ꢈꢄꢉꢊꢄꢋ  
ꢈꢌꢍꢎꢏ ꢐꢑꢒꢓꢔꢕ ꢖꢗꢍ ꢐꢑꢒꢓꢔꢘ  
ꢒꢙꢚꢙꢛꢖꢏ ꢅꢜꢎꢝ ꢌ ꢎꢛꢎꢝ  
M789-038A  
15 June 1999  
 
OMEGA Model CYD201/CYD208 User’s Manual  
TABLE OF CONTENTS  
Chapter/Paragraph  
Title  
Page  
1 INTRODUCTION..........................................................................1-1  
1.0  
1.1  
1.2  
1.2.1  
1.2.2  
1.2.3  
1.3  
1.3.1  
1.3.2  
1.4  
General.......................................................................1-1  
Model CYD201/CYD208 System Description.............1-1  
Handling Liquid Helium and Liquid Nitrogen ..............1-3  
Handling Cryogenic Storage Dewars......................1-3  
LHe and LN2 Safety Precautions ............................1-3  
Recommended First Aid .........................................1-4  
Electrostatic Discharge...............................................1-4  
Identifying ESDS Components ...............................1-5  
Handling ESDS Components..................................1-5  
Safety Summary.........................................................1-5  
Safety Symbols...........................................................1-6  
1.5  
2
INSTALLATION ...........................................................................2-1  
2.0  
2.1  
2.2  
2.3  
General.......................................................................2-1  
Inspection and Unpacking..........................................2-1  
Repackaging For Shipment........................................2-1  
Power and Ground Requirements..............................2-2  
Sensor Installation Recommendations.......................2-2  
Two-Lead Vs. Four-Lead Measurements................2-3  
Connecting Leads to the Sensor.............................2-4  
Sensor Mounting.....................................................2-4  
Measurement Errors Due to AC Noise....................2-5  
Sensor Input Connections..........................................2-6  
Sensor Curve Definition..............................................2-7  
Rack Mounting............................................................2-7  
Initial Power Up Sequence .........................................2-9  
Power Up Errors.........................................................2-9  
2.4  
2.4.1  
2.4.2  
2.4.3  
2.4.4  
2.5  
2.6  
2.7  
2.8  
2.9  
3
OPERATION ................................................................................3-1  
3.0  
3.1  
3.2  
3.3  
3.4  
3.5  
3.5.1  
3.5.2  
3.5.3  
3.6  
3.6.1  
3.6.2  
3.6.3  
General.......................................................................3-1  
Units Key ....................................................................3-1  
Channel Key (Model CYD208 Only)...........................3-2  
Scan Mode .................................................................3-2  
Setting Dwell Times....................................................3-2  
Alarm Operation .........................................................3-2  
Alarm Setpoint ........................................................3-2  
Latched and Unlatched Alarms...............................3-3  
Alarm Fix Function (Model CYD208 Only)..............3-3  
SoftCal™ Compensations ..........................................3-3  
SoftCal™ Calibration Procedure.............................3-4  
Verifying SoftCal™ Operation.................................3-5  
Erasing SoftCal™ Compensations .........................3-5  
Table of Contents  
i
 
OMEGA Model CYD201/CYD208 User’s Manual  
TABLE OF CONTENTS (Continued)  
Chapter/Paragraph  
Title  
Page  
4 REMOTE OPERATION................................................................4-1  
4.0  
4.1  
4.1.1  
4.1.2  
4.1.3  
4.1.4  
4.2  
General.......................................................................4-1  
Serial Interface ...........................................................4-1  
Serial Interface Connections...................................4-1  
Serial Interface Operation.......................................4-3  
Sample Basic Program ...........................................4-3  
Sample QuickBasic 4.0 Program ............................4-4  
Serial Interface Command Summary..........................4-4  
5
SERVICE......................................................................................5-1  
5.0  
5.1  
5.2  
5.3  
5.4  
5.5  
5.6  
5.7  
General.......................................................................5-1  
Model CYD201 Rear Panel Connections ...................5-1  
Model CYD208 Rear Panel Connections ...................5-2  
Error Code Troubleshooting .......................................5-3  
General Maintenance .................................................5-3  
Fuse Replacement .....................................................5-4  
Line Voltage Configuration .........................................5-4  
Recalibration...............................................................5-5  
Current Source Calibration......................................5-5  
A/D Converter Calibration .......................................5-6  
Serial Interface Cable and Adapters...........................5-6  
5.7.1  
5.7.2  
5.8  
6
OPTIONS AND ACCESSORIES..................................................6-1  
6.0  
6.1  
6.2  
6.3  
General.......................................................................6-1  
Accessories ................................................................6-1  
Wires ..........................................................................6-2  
Sensors ......................................................................6-3  
APPENDIX A – CURVE TABLES ......................................................A-1  
A1.0 General...................................................................... A-1  
ii  
Table of Contents  
 
OMEGA Model CYD201/CYD208 User’s Manual  
LIST OF ILLUSTRATIONS  
Figure No.  
Title  
Page  
1-1  
Typical Cryogenic Dewar..........................................................1-3  
2-1  
2-2  
2-3  
Model CYD201 Sensor Connector J1 Details...........................2-6  
Model CYD208 Sensor Connector J1 Details...........................2-6  
Model 2090 Rack Mounting ......................................................2-8  
3-1  
3-2  
Model CYD201 Front Panel......................................................3-1  
Model CYD208 Front Panel......................................................3-1  
4-1  
4-2  
Serial I/O (RJ-11) Connector Pin Definitions ............................4-2  
Serial Interface Connections.....................................................4-2  
5-1  
5-2  
5-3  
5-4  
5-5  
5-6  
5-7  
Model CYD201 Rear Panel Connections..................................5-1  
Model CYD208 Rear Panel Connections..................................5-2  
Line Voltage Jumper Configuration ..........................................5-4  
Calibration Connections............................................................5-5  
Model CYD200-J10 RJ-11 Cable Assembly Wiring Details......5-6  
Model CYD200-D RJ-11 to DB-25 Adapter Wiring Details .......5-6  
Model CYD200-B RJ-11 to DE-9 Adapter Wiring Details .........5-3  
6-1  
Serial Interface Adapters ..........................................................6-3  
LIST OF TABLES  
Table No.  
Title  
Page  
1-1  
Model CYD201/CYD208 Specifications....................................1-2  
2-1  
2-2  
Line Voltage and Fuse Rating Selection...................................2-2  
Model CYD201/CYD208 Temperature Curves .........................2-7  
4-1  
Serial Interface Specifications ..................................................4-1  
A-1 Curve 0 - DT-500DI-8B Voltage-Temp. Characteristics........... A-1  
A-2 Curve 1 - DT-500DI-8A Voltage-Temp. Characteristics........... A-2  
A-3 Curve 2 - DT-500DRC-D Voltage-Temp. Characteristics ........ A-3  
A-4 Curve 3 - DT-500DRC-E1 Voltage-Temp. Characteristics....... A-4  
A-5 Curve 4 - CTI Diode Voltage-Temp. Characteristics................ A-5  
A-6 Curve 5 - DT-500DI-8C Voltage-Temp. Characteristics .......... A-6  
A-7 Curve 6 - CY-7 Voltage-Temp. Characteristics........................ A-7  
Table of Contents  
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OMEGA Model CYD201/CYD208 User’s Manual  
This Page Intentionally Left Blank  
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Table of Contents  
 
OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 1  
INTRODUCTION  
1.0  
GENERAL  
This chapter covers a general description of the Model CYD201/CYD208  
(Paragraph 1.1), Handling Liquid Helium and Liquid Nitrogen (Paragraph 1.2),  
Electrostatic Discharge (Paragraph 1.3), Safety Summary (Paragraph 1.4),  
and Safety Symbols (Paragraph 1.5).  
Due to the OMEGA commitment to continuous product improvement,  
modifications may occur to the Model CYD201/CYD208 software with time.  
Some of these changes result from Customer feedback about operation on  
various cryogenic systems. We encourage comments or suggestions  
regarding this instrument. Please return the instrument warranty card to  
ensure receipt of future software updates.  
1.1  
MODEL CYD201/CYD208 GENERAL DESCRIPTION  
Model CYD201/CYD208 Digital Thermometers are ideal to monitor critical  
temperatures in chemical and materials research, superconductivity  
measurements, and low temperature physics. The units feature:  
• Broad Temperature Range: 1.4 K to 475 K (–272 °C to 202 °C).  
• Single Channel (CYD201) and Eight Channel (CYD208) Models.  
• For use with CY-7 Series, DT-500 Series, and other Silicon Diode  
Sensors.  
• System Accuracy (Instrument with Sensor) with SoftCal™ to within  
±0.1 °C or better.  
• Temperature display in °C, °F, K, or Sensor Voltage.  
• High/Low Alarm Setpoint with Interfacing Alarm Contacts.  
• Standard RS-232C Output of Temperature, Input of Settings, and  
Alarm Status for Remote Operation.  
Introduction  
1-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table 1-1. Model CYD201/CYD208 Specifications  
Display: Four-digit LED display  
Resolution: 0.1 for values > 100 or < –100  
0.01 for values between -100<T<100  
Temperature Range: 1.4 K to 475 K without probe  
23 K to 473 K with probe  
System Accuracy: To within ±0.1K from 177 K to 313 K.  
To ±0.2 K or better from 30 K to 373 K.  
±1.0 K above 373 K.  
Sensor Excitation: 10 µA constant current  
Repeatability: <50 mK  
Input Range: 0 to 3 volts with a resolution of 0.1 mV  
Hi/Lo Alarm Setpoint: 0.1° resolution  
Alarm Relay: Single SPDT relay, rated 28 VDC or Peak AC, 0.25 A  
(3 W max.)  
Scan/Dwell: The Model CYD208 automatically scans all eight channels  
with selectable dwell times of 0 (skip), 5, 10, 30 and 60  
seconds for each channel.  
Connections:Four-lead sensor connection (2 current, 2 voltage).  
Response Curves*: Standard Curve 10, DT-500DI-8A  
(also -8B and -8C), DT-500DRC-D,  
DT-500DRC-E1, and CTI Curve C.  
* SOFTCAL™ qualified only for CY-7 Series diode sensors.  
COMPUTER INTERFACE  
Type: RS-232C Serial Three Wire (Refer to Table 4-1).  
MECHANICAL  
Ambient Temperature Range: 18 to 28 °C (64 to 82 °F),  
or 15 to 35 °C (59 to 95 °F) with reduced accuracy.  
Power Requirements: 90-125 or 210-250 VAC, 50/60 Hz, 3 watts.  
Dimensions: 41 x 106 x 164 mm (1.61 x 4.18 x 6.45 inches).  
Weight: 0.5 kilogram (1.1 Pounds)  
NOTES  
1. Product Specifications subject to change without notice.  
2. System electronic temperature accuracy in a given temperature range is the  
sum of the specifications given for input and output. Sensor calibration errors  
are not included.  
1-2  
Introduction  
 
OMEGA Model CYD201/CYD208 User’s Manual  
1.2  
HANDLING LIQUID HELIUM AND LIQUID NITROGEN  
Helium and Nitrogen are colorless, odorless, and tasteless gases. They  
liquefy when properly cooled. Liquid helium (LHe) and liquid nitrogen (LN2)  
may be used in conjunction with the Model CYD201 or CYD208. Although  
not explosive, there are certain safety considerations in the handling of LHe  
and LN2.  
1.2.1 Handling Cryogenic Storage Dewars  
Operate all cryogenic containers (dewars) in  
accordance with manufacturer instructions. Safety  
instructions are normally posted on the side of  
each dewar. Keep cryogenic dewars in a well-  
ventilated place, protected from the weather, and  
away from heat sources. Figure 1-1 shows a  
typical cryogenic dewar.  
NON-  
MAGNETIC  
NON-  
LIQUID  
HELIUM  
FLAMMABLE  
KEEP  
UPRIGHT  
1.2.2 LHe and LN2 Safety Precautions  
Transfer LHe and LN2 and operate storage dewar  
controls in accordance with manufacturer/supplier  
instructions. During transfer, follow all safety  
precautions written on the storage dewar and  
recommended by the manufacturer.  
Figure 1-1. Typical  
Cryogenic Dewar  
WARNING  
•
Liquid helium is a potential asphyxiant and can cause rapid  
suffocation without warning. Store and use in an adequately  
ventilated area. DO NOT vent the container in confined spaces. DO  
NOT enter confined spaces where gas may be present unless area  
is well-ventilated. If inhaled, remove to fresh air. If not breathing,  
give artificial respiration. If breathing is difficult, give oxygen. Get  
medical attention.  
•
Liquid helium can cause severe frostbite to exposed body parts. DO  
NOT touch frosted pipes or valves. For frostbite, consult a  
physician immediately. If a physician is unavailable, warm the  
affected parts with water that is near body temperature.  
Two essential safety aspects of handling LHe are adequate ventilation and  
eye and skin protection. Although helium and nitrogen gases are non-toxic,  
they are dangerous because they replace air in a normal breathing  
atmosphere. Liquid helium is an even greater threat because a small  
amount of liquid evaporates to create a large amount of gas. Store and  
operate cryogenic dewars in open, well-ventilated areas.  
Introduction  
1-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
When transferring LHe and LN2, protect eyes and skin from accidental  
contact with liquid or the cold gas issuing from it. Protect eyes with full face  
shield or chemical splash goggles; safety glasses (even with side shields)  
are inadequate. Always wear special cryogenic gloves (Tempshield  
Cryo-Gloves® or equivalent) when handling anything that is, or may have  
been, in contact with the liquid or cold gas, or with cold pipes or equipment.  
Wear long sleeve shirts and cuffless trousers long enough to prevent liquid  
from entering shoes.  
1.2.3 Recommended First Aid  
Post an appropriate Material Safety Data Sheet (MSDS) obtained from the  
manufacturer/distributor at every site that stores and uses LHe and LN2. The  
MSDS specifies symptoms of overexposure and first aid.  
If a person exhibits symptoms of asphyxia such as headache, drowsiness,  
dizziness, excitation, excessive salivation, vomiting, or unconsciousness,  
remove to fresh air. If breathing is difficult, give oxygen. If breathing stops,  
give artificial respiration. Call a physician immediately.  
If exposure to cryogenic liquids or cold gases occurs, restore tissue to  
normal body temperature (98.6°F) by bathing it in warm water not exceeding  
105 °F (40 °C). DO NOT rub the frozen part, either before or after  
rewarming. Protect the injured tissue from further damage and infection and  
call a physician immediately. Flush exposed eyes thoroughly with warm  
water for at least 15 minutes. In case of massive exposure, remove clothing  
while showering with warm water. The patient should not drink alcohol or  
smoke. Keep warm and rest. Call a physician immediately.  
1.3  
ELECTROSTATIC DISCHARGE  
Electrostatic Discharge (ESD) may damage electronic parts, assemblies,  
and equipment. ESD is a transfer of electrostatic charge between bodies at  
different electrostatic potentials caused by direct contact or induced by an  
electrostatic field. The low-energy source that most commonly destroys  
Electrostatic Discharge Sensitive (ESDS) devices is the human body, which  
generates and retains static electricity. Simply walking across a carpet in  
low humidity may generate up to 35,000 volts of static electricity.  
Current technology trends toward greater complexity, increased packaging  
density, and thinner dielectrics between active elements, which results in  
electronic devices with even more ESD sensitivity. Some electronic parts  
are more ESDS than others. ESD levels of only a few hundred volts may  
damage electronic components such as semiconductors, thick and thin film  
resistors, and piezoelectric crystals during testing, handling, repair, or  
assembly. Discharge voltages below 4000 volts cannot be seen, felt, or  
heard.  
1-4  
Introduction  
 
OMEGA Model CYD201/CYD208 User’s Manual  
1.3.1 Identifying ESDS Components  
Below are some industry symbols used to label components as ESDS:  
1.3.2 Handling ESDS Components  
Observe all precautions necessary to prevent damage to ESDS components  
before installation. Bring the device and everything that contacts it to ground  
potential by providing a conductive surface and discharge paths. At a  
minimum, observe these precautions:  
1. De-energize or disconnect all power and signal sources and loads used  
with unit.  
2. Place unit on a grounded conductive work surface.  
3. Ground technician through a conductive wrist strap (or other device)  
using 1 M series resistor to protect operator.  
4. Ground any tools, such as soldering equipment, that will contact unit.  
Contact with operator's hands provides a sufficient ground for tools that  
are otherwise electrically isolated.  
5. Place ESDS devices and assemblies removed from a unit on a  
conductive work surface or in a conductive container. An operator  
inserting or removing a device or assembly from a container must  
maintain contact with a conductive portion of the container. Use only  
plastic bags approved for storage of ESD material.  
6. Do not handle ESDS devices unnecessarily or remove from the  
packages until actually used or tested.  
1.4  
SAFETY SUMMARY  
Observe these general safety precautions during all phases of instrument  
operation, service, and repair. Failure to comply with these precautions or  
with specific warnings elsewhere in this manual violates safety standards of  
design, manufacture, and intended instrument use. OMEGA assumes no  
liability for Customer failure to comply with these requirements.  
Ground The Instrument  
To minimize shock hazard, connect instrument chassis and cabinet to an  
electrical ground. The instrument comes with a 3-conductor AC power  
cable. Plug it into an approved three-contact electrical outlet or use a three-  
contact adapter with the green ground wire firmly secured to an electrical  
ground (safety ground) at the power outlet. The power cable jack and  
mating plug meet Underwriters Laboratories (UL) and International  
Electrotechnical Commission (IEC) safety standards.  
Introduction  
1-5  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Do Not Operate In An Explosive Atmosphere  
Do not operate the instrument in the presence of flammable gases or fumes.  
Operation of any electrical instrument in such an environment constitutes a  
definite safety hazard.  
Keep Away From Live Circuits  
Operating personnel must not remove instrument covers. Refer component  
replacement and internal adjustments to qualified maintenance personnel.  
Do not replace components with power cable connected. To avoid injuries,  
always disconnect power and discharge circuits before touching them.  
Do Not Substitute Parts Or Modify Instrument  
Do not install substitute parts or perform any unauthorized modification to  
the instrument. Return the instrument to an authorized OMEGA Cryotronics,  
Inc. representative for service and repair to ensure that safety features are  
maintained.  
1.5  
SAFETY SYMBOLS  
Direct current (power line).  
Alternating current (power line).  
Alternating or direct current (power line).  
Three-phase alternating current (power line).  
t
Y
Earth (ground) terminal.  
Protective conductor terminal.  
Frame or chassis terminal.  
On (supply)  
Off (supply)  
Equipment protected throughout by double insulation or  
reinforced insulation (equivalent to Class II of IEC 536 - see  
annex H).  
Caution: High voltages or temperatures. Background color:  
Yellow; Symbol and outline: Black.  
Caution or Warning - See instrument documentation.  
Background color: Yellow; Symbol and outline: Black.  
1-6  
Introduction  
 
OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 2  
INSTALLATION  
2.0  
GENERAL  
This chapter covers Inspection and Unpacking (Paragraph 2.1),  
Repackaging for Shipment (Paragraph 2.2), Sensor Installation  
Recommendations (Paragraph 2.3) Power and Ground Requirements  
(Paragraph 2.4), Sensor Curve Definitions (Paragraph 2.5), and Rack  
Mounting (Paragraph 2.6).  
2.1  
INSPECTION AND UNPACKING  
Remove packing list and verify receipt of all equipment. For question  
about the shipment, please call OMEGA Customer Service Department at  
1-800-622-2378 or (203) 359-1660.  
Upon receipt, inspect container and equipment for damage. Note  
particularly any evidence of freight damage. Immediately report any damage  
to the shipping agent  
NOTE: The carrier will not honor any claims unless all shipping material is  
saved for their examination. After examining and removing contents, save  
packing material and carton in the event reshipment is necessary.  
2.2  
REPACKAGING FOR SHIPMENT  
To return the Model CYD201/CYD208, sensor, or accessories for repair or  
replacement, obtain a Authorized Return (AR) number from Technical  
Service in the United States, or from the authorized sales/service  
representative from which the product was purchased. Instruments may not  
be accepted without a RGA number. When returning an instrument for  
service, OMEGA must have the following information before attempting any  
repair.  
1. Instrument model and serial number.  
2. User name, company, address, and phone number.  
3. Malfunction symptoms.  
4. Description of system.  
5. Authorized Return (AR) number.  
Repack the system in its original container (if available). Write AR number  
on the outside of the container or on the packing slip. If not available,  
consult OMEGA for shipping and packing instructions.  
Installation  
2-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2.3  
POWER AND GROUND REQUIREMENTS  
The Model CYD201/CYD208 requires a power source of 90 to 125 or 210 to  
250 VAC, 50 or 60 Hz, single phase, 3 Watts. Three-prong detachable  
power cord for 120 VAC operation included. Connect to rear panel  
UL/IEC/ICEE standard plug. See Table 2-1 for fuse rating.  
WARNING: To prevent electrical fire or shock hazards, do not expose  
this instrument to rain or excess moisture.  
CAUTION: Verify proper fuse installation and AC Line Voltage Selection  
Wheel on the Model CYD201/CYD208 rear panel set to available AC line  
voltage before inserting power cord and turning on the instrument.  
Refer to Chapter 5 to change voltage configuration.  
NOTE: Do not attach the shield to earth ground at the sensor end. It may  
introduce noise at the measurement end.  
Table 2-1. Line Voltage and Fuse Rating Selection  
Select  
Range  
Fuse  
115  
230  
90 – 125 VAC  
210 – 250 VAC  
0.2 A (Slow Blow)  
0.1 A (Slow Blow)  
To protect operating personnel, the National Electrical Manufacturer’s  
Association (NEMA) recommends, and some local codes require, grounded  
instrument panels and cabinets. The 3-conductor power cable, when  
plugged into an appropriate receptacle, grounds the instrument.  
Grounding and shielding signal lines are major concerns when setting up  
any precision instrument or system. The CYD201/CYD208 includes ground  
isolation of sensor excitation to allow 4-wire measurement of diode voltage  
and resistance. Improperly grounding sensor leads and shields can defeat  
this feature.  
Model CYD201/CYD208 digital logic ties directly to earth ground for  
interface communication. The low side of the heater output connects directly  
to earth ground. Shield sensor cables whenever possible. Attach the shields  
to the connector shield pin.  
2.4  
SENSOR INSTALLATION RECOMMENDATIONS  
See the OMEGA Product Catalog for sensor installation and specifications.  
Call OMEGA for copies of application notes or sensor installation questions.  
Below are general recommendations on sensor installation:  
1. Do not ground the sensor.  
2. Shield leads and connect shield wire to SHIELD on screw terminal  
connector only. Do not connect shield at other end of cable.  
2-2  
Installation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
3. Keep leads as short as possible.  
4. Use twisted-pair wire. Use Duo-Twist™ wire (or equivalent) for two-wire,  
or Quad-Twist™ wire (or equivalent) for four-wire applications.  
5. Thermally anchor lead wires.  
2.4.1 Two-Lead Vs Four-Lead Measurements  
In two-lead measurement, the leads that measure sensor voltage also carry  
the current. The voltage measured at the instrument is the sum of the  
temperature sensor voltage and the IR voltage drop within the two current  
leads. Since heat flow down the leads can be critical in a cryogenic  
environment, wire of small diameter and significant resistance per foot is  
preferred to minimize this heat flow. Consequently, a voltage drop within the  
leads may exist.  
Four-lead measurement confines current to one pair of leads and measures  
sensor voltage with the other lead pair carrying no current.  
2.4.1.1 Two-Lead Measurement  
Sometimes system constraints dictate  
I+  
two-lead measurement. Connect the  
V+  
positive terminals (V+ and I+) together  
and the negative terminals (V– and I–)  
together at the instrument, then run  
two leads to the sensor.  
Two-Lead  
Measurements  
V–  
I–  
Expect some loss in accuracy; the  
voltage measured at the voltmeter equals the sum of the sensor voltage and  
the voltage drop across the connecting leads. The exact measurement error  
depends on sensor sensitivity and variations resulting from changing  
temperature. For example, a 10 lead resistance results in a 0.1 mV  
voltage error. The resultant temperature error at liquid helium temperature is  
only 3 mK, but, because of the lower sensitivity (dV/dT) of the diode at  
higher temperatures, it becomes 10 mK at liquid nitrogen temperature.  
2.4.1.2 Four-Lead Measurement  
All sensors, both two-lead and four-lead devices,  
can be measured in a four-lead configuration to  
eliminate the effects of lead resistance. The exact  
point at which the connecting leads solder to the  
two-lead sensor normally results in a negligible  
temperature uncertainty.  
I+  
V+  
Four-Lead  
Diode  
V–  
I–  
Installation  
2-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2.4.2 Connecting Leads To The Sensor  
Excessive heat flow through connecting leads to any temperature sensor  
may differ the temperature between the active sensing element and the  
sample to which the sensor mounts. This reflects as a real temperature  
offset between what is measured and the true sample temperature.  
Eliminate such temperature errors with proper selection and installation of  
connecting leads.  
To minimize heat flow through the leads, select leads of small diameter and  
low thermal conductivity. Phosphor-bronze or Manganin wire is commonly  
used in sizes 32 or 36 AWG. These wires have a fairly low thermal  
conductivity, yet electrical resistance is not large enough to create  
measurement problems.  
Thermally anchor lead wires at several temperatures between room  
temperature and cryogenic temperatures to guarantee no heat conduction  
through the leads to the sensor.  
2.4.3 Sensor Mounting  
DT-470-SD  
Diode Sensor Leads  
Before installing a diode sensor, identify  
which lead is the anode and which is the  
cathode. When viewed with the base down  
and the leads towards the observer, the  
anode is on the right and the cathode is on  
the left. The OMEGA CY-7-SD silicon diode  
sensor lead configuration is shown to the  
right. For other sensors, read accompanying  
Cathode  
Anode  
literature or consult the manufacturer to  
positively identify sensor leads. Lead identification should remain clear even  
after sensor installation. Record the sensor serial number and location.  
On the CY-7-SD, the base is the largest flat surface. It is sapphire with gold  
metalization over a nickel buffer layer. The base is electrically isolated from  
the sensing element and leads; make all thermal contact to the sensor  
through the base. A thin braze joint around the sides of the SD package  
electrically connect to the sensing element. Avoid contact to the sides with  
any electrically conductive material.  
When installing the sensor, make sure there are no electrical shorts or  
current leakage paths between the leads or between the leads and ground.  
If IMI-7031 varnish or epoxy is used, it may soften varnish-type lead  
insulations so that high resistance shunts appear between wires if sufficient  
time for curing is not allowed.  
Slide Teflon® spaghetti tubing over bare leads when the possibility of  
shorting exists. Avoid putting stress on the device leads and allow for  
thermal contractions that occur during cooling which could fracture a solder  
joint or lead if installed under tension at room temperature.  
2-4  
Installation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
For temporary mounting in cold temperature applications, apply a thin layer  
of Apiezon® N Grease between the sensor and sample to enhance thermal  
contact under slight pressure. The preferred method for mounting the  
CY-7-SD sensor is the OMEGA CO Adapter.  
CAUTION: OMEGA will not warranty replace any device damaged by  
user-designed clamps or solder mounting.  
For semi-permanent mountings, use Stycast epoxy instead of Apiezon® N  
Grease. NOTE: Do not apply Stycast epoxy over the CY-7-SD package:  
sensor stress may shift the readings. In all cases, periodically inspect the  
sensor mounting to verify good thermal contact to the mounting surface is  
maintained.  
2.4.4 Measurement Errors Due To AC Noise  
Poorly shielded leads or improperly grounded measurement systems can  
introduce AC noise into the sensor leads. In diode sensors, the AC noise  
shifts the DC voltage measurement due to the diode non-linear  
current/voltage characteristics. When this occurs, measured DC voltage is  
too low and the corresponding temperature reading is high. The  
measurement error can approach several tenths of a kelvin. To determine if  
this problem exists, perform either procedure below.  
1. Place a capacitor across the diode to shunt induced AC currents.  
Capacitor size depends on the noise frequency. If noise is related to  
power line frequency, use a 10 µF capacitor. If AC-coupled digital noise  
is suspected (digital circuits or interfaces), use a 0.1 to 1 µF capacitor. In  
either case, if measured DC voltage increases, there is induced noise in  
the measurement system.  
2. Measure AC voltage across the diode with an AC voltmeter or  
oscilloscope. Most voltmeters do not have the frequency response to  
measure noise associated with digital circuits or interfaces (which  
operate in the MHz range). For a thorough discussion of this potential  
problem, and the magnitude of error which may result, request the paper  
“Measurement System-Induced Errors In Diode Thermometry,” J.K.  
Krause and B.C. Dodrill, Rev. Sci. Instr. 57 (4), 661, April, 1986.  
To greatly reduce potential AC noise, connect twisted leads (pairs) between  
the measurement instruments and the diode sensors. Use 32 or 36 AWG  
OMEGA Duo-Twist™ Cryogenic Wire, which features phosphor bronze wire  
twisted at 3.15 twists per centimeter (8 twists per inch). See the OMEGA  
Product Catalog or contact OMEGA for further information.  
Installation  
2-5  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2.5  
SENSOR INPUT CONNECTIONS  
The Model CYD201 has one rear panel 4-pin sensor input connector  
designated J1 INPUT 1. The connector pins, numbered 1 thru 4, are shown  
below.  
Terminal  
Description  
J1 INPUT 1  
4
1
2
3
+ Current Out  
– Current Out  
– Voltage Sense  
+ Voltage Sense  
Shield  
1
4
2
3
CASE  
Figure 2-1. Model CYD201 Sensor Connector J1 Details  
The Model CYD208 has a 36-pin “Miniature-D” style connector designated  
J1 INPUTS for inputs 1 thru 8. A Model CYD208-D connector is included to  
solder interfacing connections to J1. The pin configuration of the Model  
CYD208-D is shown below.  
Terminal Description  
2
4
6
8
10 12 14 16 18  
11 13 15  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
+V - Input 1  
-V - Input 1  
+V - Input 2  
-V - Input 2  
+V - Input 3  
-V - Input 3  
+V - Input 4  
-V - Input 4  
+V - Input 5  
-V - Input 5  
+V - Input 6  
-V - Input 6  
+V - Input 7  
-V - Input 7  
+V - Input 8  
-V - Input 8  
Shield  
1
3
5
7
9
17  
20 22 24 26 28 30 32 34 36  
19 21 23 25 27 29 31 33 35  
Terminal Description  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
+I - Input 4  
-I - Input 4  
+I - Input 5  
-I - Input 5  
+I - Input 6  
-I - Input 6  
+I - Input 7  
-I - Input 7  
+I - Input 8  
-I - Input 8  
Shield  
Shield  
+I - Input 1  
-I - Input 1  
+I - Input 2  
-I - Input 2  
+I - Input 3  
-I - Input 3  
Shield  
Figure 2-2. Model CYD208-D Sensor Connector Details  
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Installation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2.6  
SENSOR CURVE DEFINITION  
To display accurate temperature, select a response curve that matches the  
installed sensor. There are seven standard curves stored within the Model  
CYD201/CYD208 numbered 0 through 6 (see Appendix A). Different curves  
may be assigned to each channel of the Model CYD208. Find the unit  
factory curve configuration inside the front cover of this manual. Curve 6  
(CY-7 Curve 10) is the standard curve configuration unless specified  
differently upon order.  
To determine current curve selection, press and hold UNITS and turn on (1)  
the rear panel SET switch (DIP switch 3). Release UNITS key. The CYD201  
displays the curve number in the display window. The Model CYD208  
displays the curve number in the display window and the channel number in  
the channel window. To display curves for other channel numbers in the  
Model CYD208, press CHANNEL to scroll through the eight channels.  
To change the curve, press UNITS. The instrument scrolls through curves 0  
through 6. In the Model CYD208, press CHANNEL to select other channels,  
then press UNITS to scroll through the curves.  
After the new curve selection, turn the SET switch on the rear panel off (0).  
The unit returns to normal operation.  
Table 2-2. Model CYD201/CYD208 Temperature Curves  
Curve No.  
Range (K)  
Description  
0
1
2
3
4
5
6
0 – 324.9  
0 – 324.9  
0 – 324.9  
0 – 324.9  
0 – 324.9  
0 – 324.9  
0 – 474.9  
DT-500DI-8B  
DT-500DI-8A  
DT-500DRC-D  
DT-500TDC-E1  
CTI Curve C  
DT-500DI-8C  
CY-7 Curve 10  
2.7  
RACK MOUNTING  
The Models CYD201 and CYD208 can install in a standard “size” 1/4 panel  
EIA rack space. If you ordered a CYD208-DIN rack mounting adapter, follow  
the installation instructions below. See Figure 2-3.  
1. Remove front feet on bottom of unit and attach lower rack piece by  
threading two of the four screws provided into the front feet holes.  
2. Locate the two mounting hole access covers on the top of the unit.  
Attach the other rack with the remaining screws.  
Installation  
2-7  
 
OMEGA Model CYD201/CYD208 User’s Manual  
0.265 (6.73)  
A
0.215 (5.46)  
B
A
Hole Sizes:  
A = 0.189 (0.480) Diameter - 4 Places  
B = 0.169 (0.429) Diameter - 2 Places  
Model CYD201 or CYD208 Front Panel  
A
B
A
C
1.44  
(35.58)  
L
1.44  
(35.58)  
4.18 (106.17)  
Figure 2-3. Model CYD208-DIN Rack Mounting  
2-8  
Installation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2.8  
INITIAL POWER UP SEQUENCE  
The test sequence below occurs at power up.  
1. All display segments light.  
2. The unit displays “-201-” or “-208-”.  
3. The instrument begins normal operation. Units currently selected flash.  
Model CYD208s also indicate the current channel selected.  
2.9  
POWER UP ERRORS  
On power up, the CYD201/CYD208 checks internal memory. If a problem  
exists, an error message displays on the front panel of the instrument.  
“Er01” indicates a hardware problem in the instrument memory. This error is  
not user-correctable. First perform the procedure in Paragraph 5.3. If  
unsuccessful, then call the factory.  
“Er02” indicates a soft error in the instrument memory. To correct this error,  
close dip switch 1 on the rear panel for at least 5 seconds, then open it.  
Follow the calibration procedure described in Paragraph 5.3 after an error 2  
reset.  
“OL” indicates a voltage input overload. This can be caused by an open  
sensor or diode sensor wired backwards.  
Installation  
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2-10  
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OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 3  
OPERATION  
3.0  
GENERAL  
This chapter covers the Units Key (Paragraph 3.1), the Channel key  
(Paragraph 3.2), Scan Mode (Paragraph 3.3), Setting Dwell Times  
(Paragraph 3.4), Alarm Operation (Paragraph 3.5), SoftCal™  
Compensations (Paragraph 3.6), Calibration (Paragraph 3.7), Verifying  
SoftCal™ Operation (Paragraph 3.8), and Erasing SoftCal™  
Compensations (Paragraph 3.9).  
UNITS  
K °C  
V °F  
ON  
OFF  
CYD201 THERMOMETER  
Figure 3-1. Model CYD201 Front Panel  
UNITS  
K °C  
V °F  
CHANNEL  
ON  
OFF  
CYD208 THERMOMETER  
Figure 3-2. Model CYD208 Front Panel  
UNITS KEY  
3.1  
UNITS selects different units of measurement. The thermometer reads in  
voltage or temperature (°C, °F, or K). Press UNITS to scroll through the  
various selections.  
UNITS also determines if SoftCal™ is active. Press and hold UNITS for  
3 seconds. If SoftCal™ is not active, -000- appears in the display.  
Operation  
3-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
3.2  
CHANNEL KEY (Model CYD208 Only)  
CHANNEL scrolls through the eight possible sensor channels. It also  
determines if scan mode is activated. Hold 1 to 2 seconds to toggle scan  
mode On or Off. A red light glows in the upper left channel display if scan  
mode is active.  
3.3  
SCAN MODE (Model CYD208 Only)  
The thermometer can scan 8 channels or monitor 1 channel. To enable  
scan mode, press CHANNEL for 1 to 2 seconds to toggle scan mode On or  
Off. If a light appears in upper left of channel display window, then scan  
mode is On. If the light does not appear, the thermometer is in single-  
channel mode. Repeat action to reverse mode.  
3.4  
SETTING DWELL TIMES (Model CYD208 Only)  
Set the time the thermometer pauses on each channel (dwell) for 5, 10, 30,  
or 60 seconds. A dwell time of 0 instructs the thermometer to skip that  
particular channel. To set the dwell:  
1. Hold CHANNEL for 3 seconds. Do not release.  
2. While still pressing CHANNEL, use UNITS to select the desired time;  
0 (skip), 5, 10, 30, or 60 seconds.  
3. Repeat procedure for each desired channel. Default channel dwell is  
5 seconds.  
3.5  
ALARM OPERATION  
This section covers Alarm Setpoint (Paragraph 3.5.1), Latched and  
Unlatched Alarms (Paragraph 3.5.2.), and the Alarm Fix Function  
(Paragraph 3.5.3).  
3.5.1 Alarm Setpoint  
The alarm setpoint is a temperature which activates the alarm relay. Set it to  
warn of temperatures rising above (high alarm) or falling below (low alarm) a  
certain point.  
NOTE: Alarm setpoints work for temperatures, not voltage. If in voltage  
mode while setting an alarm setpoint, the thermometer defaults to kelvin for  
the alarm setpoint.  
To display the alarm setpoint, move the SET switch on the rear panel to  
position 1. To change the setpoint:  
1. Make sure the SET switch is in position 1.  
3-2  
Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
2. Hold UNITS until the desired temperature displays. UNITS is a toggle; if  
it is released and pressed again, the temperature direction reverses. If  
the temperature display increases, the alarm is a high setpoint. If the  
temperature display decreases, the alarm is a low setpoint.  
3. Release UNITS when the desired setpoint displays. For a Model  
CYD208, press CHANNEL to display the desired channel in the channel  
window and repeat the steps above to set the alarm for each channel  
4. Move the SET switch back to position 0 to enable the alarm. When it  
triggers, an alarm status light appears in the upper left of the  
temperature display.  
The alarm can be connected to another device which triggers when the  
alarm activates. The 3-contact terminal block is present on the rear panel as  
J3 ALARM. The alarm contacts are designated 1 COM 2 with 1 representing  
the normally open state and 2 representing the normally closed state.  
3.5.2 Latched And Unlatched Alarms  
Alarms are either latched or unlatched. The alarm is latched when the  
LATCH switch is in position 1: the alarm turns On when triggered by the  
alarm setpoint, but will not automatically turn Off when the temperature  
returns to within the high and low setpoint range. The alarm is unlatched  
when the LATCH switch is in position 0; the alarm turns On when triggered  
by the alarm setpoint, and automatically turns Off when temperatures return  
to within the high and low setpoint range.  
3.5.3 Alarm Fix Function (Model CYD208 Only)  
Set the FIX switch on the Model CYD208 rear panel to OFF (position 0) to  
continuously update the alarm relay, depending on the alarm setpoint and  
sensor temperature. If the FIX switch is ON (position 1), the relay updates  
only when channel 1 input is active.  
3.6  
SOFTCAL™ COMPENSATIONS  
SoftCal™ is a simple, instrument-configured software calibration that  
improves system accuracy over a specified temperature range. It reduces  
the error between a CY-7 diode and the Standard Curve 10 used by the  
instrument. In short, SoftCal™ generates inexpensive calibrations for CY-7  
sensors used with OMEGA temperature controllers and monitors.  
Operation  
3-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
SoftCal™ calibrations are made at three temperature points: liquid helium  
(4.2 K), liquid nitrogen (about 77 K), and 305 K. Below is the accuracy* of  
the CY-7-SD-13 sensor:  
+0.5 K  
+0.25 K  
+0.15 K  
2 K to <30 K  
30 K to <60 K  
60 K to <345 K  
+0.25 K  
+1.0 K  
345 K to <375 K  
375 K to 475 K  
* These values generally apply to all silicon diode sensors. Only two-point  
SoftCal™ calibrations appropriate for CY-7 series Band 11, 11A sensors.  
This section covers the SoftCal™ Calibration Procedure (Paragraph 3.6.1),  
Verifying SoftCal™ Operation (Paragraph 3.6.2), and Erasing SoftCal™  
Compensations (Paragraph 3.6.3).  
3.6.1 SoftCal™ Calibration Procedure  
1. Turn on thermometer 30 minutes prior to operation.  
2. Place the SET switch in position 1.  
3. Hold UNITS until 0 kelvin (or equivalent in °C or °F) displays. The key  
acts as a toggle. If the display rises, release and press again.  
4. Press CAL ENABLE on rear panel with a pen tip. The display reads  
"-SOF-" to indicate the unit is ready to erase the current SoftCal™  
calibration. Within 2 seconds press UNITS again. The temperature  
display changes from "-SOF-" to the current SoftCal™ setting.  
5. Hold UNITS until the sensor temperature displays. For example, if  
setting SoftCal™ for liquid helium, the display reads 4.2 K. If setting for  
ice point, the display reads 0 °C.  
6. Verify sensor stabilization at calibration temperature.  
7. Press CAL ENABLE again. "-SOF-" again displays to indicate the unit is  
ready to accept the calibration point. Within 2 seconds, press UNITS to  
enter a new calibration point. (If UNITS is not pressed within 2 seconds,  
the display returns to the alarm temperature). After 15 seconds, the  
alarm setpoint temperature displays.  
8. To enter more than one point, go back to step 5. NOTE: One point may  
be entered between 1.4 K to 9.9 K. No point may be entered between  
10 K and 40 K. Two points may be entered above 40 K.  
9. Return the SET switch to position 0.  
3-4  
Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
3.6.2 Verifying SoftCal™ Operation  
Check the status of SoftCal™ by holding UNITS for 2-3 seconds. If  
SoftCal™ is not in operation, "-000-" displays.  
If the first digit of the display is 1, SoftCal™ is set for below 28 K. If either  
the second or third digit is 1, SoftCal™ is set for above 28 K.  
3.6.3 Erasing SoftCal™ Compensations  
When SoftCal™ compensations are erased, the thermometer returns to  
normal operation.  
1. Move the SET switch to position 1.  
2. Hold UNITS until the front panel displays 0. This key is a toggle. If the  
display moves in the wrong direction, release and press again.  
3. Press CAL ENABLE on rear panel using a pen tip. The display changes  
from 0 to "-SOF-". The alarm setpoint displays after erasing SoftCal™  
compensation.  
4. Move the SET switch to position 0.  
Operation  
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3-6  
Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 4  
REMOTE OPERATION  
4.0  
GENERAL  
The Model CYD201/CYD208 Digital Thermometer Serial Interface can be  
used for both operation and service. This chapter covers the Serial Interface  
(Paragraph 4.1) and Serial Interface Commands (Paragraph 4.2).  
4.1  
SERIAL INTERFACE  
The Model CYD201/CYD208 has a serial interface for RS-232C  
communications with a host computer. RS-232C is an unbalanced (single  
ended), non-terminated line used over short distances (typically 10 feet or  
less). The Model CYD201/CYD208 serial interface complies with the  
electrical format of the RS-232C Interface Standard. The serial interface  
connector is a standard 6 wire RJ-11 modular (telephone) jack.  
This section covers Serial Interface Specifications (Table 4-1), Serial  
Interface Connections (Paragraph 4.1.1), Serial Interface Hardware  
Configuration and Adapters (Figures 4-1 & 4-2), Serial Interface Operation  
(Paragraph 4.1.2), and Sample Basic and QuickBasic Programs  
(Paragraphs 4.1.3 & 4.1.4 respectively).  
Table 4-1. Serial Interface Specifications  
Transmission:  
Connector:  
Three-Wire  
RJ-11 Modular (Telephone) Socket  
Timing Format:  
Transmission Mode:  
Baud Rate:  
Asynchronous  
Half Duplex  
300  
Bits per Character:  
Parity Type:  
1 Start, 7 Data, 1 Parity, 1 Stop  
Odd  
Data Interface Levels:  
Terminator:  
Transmits/Receives Using EIA Levels  
LF (0AH)  
4.1.1 Serial Interface Connections  
The serial interface connector is a standard 6 wire RJ-11 modular  
(telephone) jack. OMEGA Model CYD200-J10 data cables, which maintain  
pin 1 polarity, simplify interconnection. OMEGA offers the Model CYD200-D  
RJ-11 to DB-25 adapter and Model CYD200-B RJ-11 to DE-9 adapter to  
connect to the host computer. See Figure 4-2.  
Remote Operation  
4-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
J2 SERIAL I/O  
PIN  
DESCRIPTION  
1
2
3
4
5
6
RS-232C In (RxD)  
RS-232C In (RxD)  
RS-232C Ground  
RS-232C Ground  
RS-232C Out (TxD)  
RS-232C Out (TxD)  
1
2
3
4
5
6
Figure 4-1. Serial I/O (RJ-11) Connector Pin Definitions  
Model CYD200-B RJ-11  
to DB-25 Adapter  
J2 SERIAL I/O  
RS-232C  
Interface Output  
on rear of Model  
CYD201 or  
CYD208  
Use whichever adapter that  
matches your computer  
serial interface connector  
Model CYD200-B  
RJ-11 to DE-9 Adapter  
Model CYD200-J10  
RJ-11 Cable Assembly  
Figure 4-2. Serial Interface Connections  
4-2  
Remote Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
4.1.2 Serial Interface Operation  
Remotely control all thermometer functions, except SoftCal™  
compensations from a computer with communications software and modem.  
Located on the rear panel is a RJ-11 modular socket designated J2 SERIAL  
I/O for host computer connection. Accessories CYD200-J10 (RS-232C  
phone cord) and CYD200-D (RJ-11 to DB-25 adapter), as well as a null  
modem adapter may be required to link the serial port of the host computer  
directly to the thermometer. When programming a Model CYD201/CYD208  
from the serial interface, consider the following:  
• Type commands in all CAPS.  
• The term free field indicates a floating decimal point placed any  
appropriate place in the string of digits.  
• [term] in examples indicates terminating characters placed by the user or  
where they appear on a returning character string from the unit.  
• Leading zeros and zeros following a decimal point are not needed in a  
command string, but they are sent in response to a query.  
• Enter temperature to 0.1 degrees. Greater precision truncates.  
Temperature is limited from 0 to 475 K.  
• Place no space between commands and the variable being sent.  
4.1.3 Sample Basic Program  
10 OPEN “COM1:300,O,7,1,RS” AS #1 ‘Open COM port  
11 PRINT “TYPE ‘QUIT’ TO EXIT”  
12 PRINT  
20 INPUT “ENTER COMMAND”;A$  
21 IF A$ = “QUIT” THEN GOTO 100  
30 A$ = A$ +CHR$(13)+CHR$(10)  
40 PRINT #1,A$;  
45 R = INSTR(A$,”W”)  
46 IF R = 0 THEN GOTO 90  
50 FOR Z = 1 TO 500: NEXT Z  
60 LINE INPUT#1,B$  
70 PRINT B$;  
‘Print QUIT message  
‘Print blank line  
‘Get command to send  
‘Look for QUIT then quit  
‘Adding CR and LF  
‘Sending command string  
‘Scan CMD for W/QUERRY  
‘If not a QUERRY skip PRINT  
‘Short delay  
‘Read back CYD201/CYD208 response  
‘PRINT instrument response  
‘Jump back to the beginning  
‘Close COM port  
90 GOTO 11  
100 CLOSE #1  
101 END  
‘End program  
Remote Operation  
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OMEGA Model CYD201/CYD208 User’s Manual  
4.1.4 Sample Quick Basic 4.0 Program  
STARTUP: OPEN “COM1:300,O,7,1,RS” FOR RANDOM AS #1  
‘open the serial port  
PRINT “TYPE ‘QUIT’ TO EXIT”  
RESTART: PRINT  
INPUT “ENTER COMMAND”; A$  
‘print ‘QUIT’ message  
‘print blank line  
‘get command to send  
IF A$ = “QUIT” THEN GOTO FINISH ‘check for quit request  
A$ = A$ + CHR$(13) + CHR$(10)  
PRINT #1, A$;  
R = INSTR(A$, “W”)  
‘adding CR and LF  
‘sending command string  
‘scan for W/query  
IF R = 0 THEN GOTO REJUMP  
FOR Z = 1 TO 500: NEXT Z  
LINE INPUT #1, B$  
‘if not query skip print  
‘short delay  
‘read back CYD201/CYD208 response  
‘print instrument response  
‘jump back to beginning  
‘close serial port  
PRINT B$;  
REJUMP: GOTO RESTART  
FINISH:  
CLOSE #1  
END  
‘end/exit program  
4.2  
SERIAL INTERFACE COMMAND SUMMARY  
Command Function  
Command Function  
F0  
H
L
R
WA  
WS  
Sensor Units for Setpoint  
Y
Scan Dwell Time *  
Scanner Channel Selection *  
Scan Disable *  
Scan Enable *  
Scan and Dwell Query *  
High Alarm Setpoint  
Low Alarm Setpoint  
Reset Alarm  
Switch ID & Alarm Data Query  
Sensor Reading & Alarm Status Query  
YC  
YH  
YS  
WY  
* Model CYD208 Only.  
Below is an explanation of the command list structure.  
Brief Description of Function  
Command Name  
Alarm Reset.  
R
Syntax of user input.  
Input:  
R
Nothing  
Returned:  
Remarks:  
Information returned in  
response to query.  
Used to reset  
the alarm.  
Explanation of  
returned data.  
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OMEGA Model CYD201/CYD208 User’s Manual  
F0  
Input:  
Sets Sensor Units for Temperature Display.  
F0x  
Returned: Nothing  
Remarks: Sets sensor units for the temperature display, where  
x = C (Celsius), F (Fahrenheit), K (kelvin), or V (volts).  
H
Select High Alarm Setpoint Value.  
Input:  
Hxxx.x  
Returned: Nothing  
Remarks: Sets high alarm setpoint, where xxx.x = temperature setpoint  
in units specified by F0 command. If the instrument is set for  
volts, the alarm defaults to kelvin.  
Example: H300[term] sets a high alarm setpoint of 300 degrees.  
L
Select Low Alarm Setpoint Value.  
Input:  
Lxxx.x  
Returned: Nothing  
Remarks: Sets low alarm setpoint, where xxx.x = temperature setpoint  
in units specified by F0 command. If the instrument is set for  
volts, the alarm defaults to kelvin.  
Example: L31.2[term] sets a low alarm setpoint of 31.2 degrees.  
R
Y
Alarm Reset.  
Input:  
R
Returned: Nothing  
Remarks: Resets the alarm.  
Channel Dwell Time (Model CYD208 Only).  
Yab  
Input:  
Returned: Nothing  
Remarks: Sets dwell time for a given channel, where a = channel 1 - 8,  
and b = the dwell time parameter as follows:  
0 = zero seconds, 1 = 5 seconds, 2 = 10 seconds,  
3 = 30 seconds, 4 = 60 seconds  
Setting a dwell time of 0 skips the specified channel in the  
sequence.  
Example: Y23[term] sets the dwell time for channel 2 to 30 seconds.  
Remote Operation  
4-5  
 
OMEGA Model CYD201/CYD208 User’s Manual  
YC  
Input:  
Channel Scanner Channel (Model CYD208 Only).  
YCx  
Returned: Nothing  
Remarks: Asynchronously selects a scanner channel for readout  
independent of scan feature, where x = channel 1 - 8.  
YH  
Input:  
End Scanning (Model CYD208 Only).  
YH  
Returned: Nothing  
Remarks: Halts input scan at current input channel. Place scanner on  
hold when sending any other commands to scanner or  
unpredictable results may occur.  
YS  
Input:  
Begin Scanning (Model CYD208 Only).  
YS  
Returned: Nothing  
Remarks: Starts input scan from current input channel. The instrument  
skips every channel with a dwell time of zero.  
WA  
Input:  
Switch ID and Alarm Data.  
WA  
Returned: For a Model CYD201, returns:  
[switch ID],[high or low alarm],[alarm sign],[alarm  
setpoint](CR)(LF)  
For a Model CYD208, returns:  
[switch ID],[high or low alarm],[alarm sign],[alarm  
setpoint],[active channel number](CR)(LF)  
Remarks: Provides the switch ID and alarm data. The switch ID  
parameter is 0 through 3 for the Model CYD201. It is the sum  
of 1 if the alarm set enable is set, plus 2 if relay latching is  
desired. The switch ID parameter is 0 through 7 for the Model  
CYD208. It is the sum of 1 if the alarm set enable is set, plus  
2 if relay latching is desired, plus 4 if the alarm fix is enabled.  
High or Low Parameter: H = high alarm, L = low alarm.  
4-6  
Remote Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
WS  
Input:  
Sample Sensor Reading and Alarm Status.  
WS  
Returned: For a Model CYD201, returns:  
[sign],[sensor reading],[units],[alarm status] (CR)(LF)  
For a Model CYD208, returns:  
[current channel],[sign],[sensor reading],[units], [alarm  
status](CR)(LF)  
Remarks: Returns the sample sensor reading and alarm status, where  
A = active and I = inactive.  
WY  
Input:  
Scan Status (Model CYD208 Only).  
WY  
Returned: [scan status],[current channel number],[channel which  
caused the alarm state], [channel 1 dwell time],[channel 2  
dwell time],...[channel 8 dwell time](CR)(LF)  
Remarks: Returns instrument scan status (scanning or holding),  
channel dwell information, and scan position. Scan Status  
Parameter: H = holding, S = scanning. Channel Which  
Caused the Alarm State Parameter = 1 through 8 or "-" if  
alarm is inactive. Channel dwell times are in seconds.  
Sending this command with a Model CYD201 returns N to  
signify no scanner.  
Remote Operation  
4-7  
 
OMEGA Model CYD201/CYD208 User’s Manual  
This Page Intentionally Left Blank  
4-8  
Remote Operation  
 
OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 5  
SERVICE  
5.0  
GENERAL  
This chapter covers Model CYD201/CYD208 maintenance: Model CYD201  
Rear Panel Connections (Paragraph 5.1), Model CYD208 Rear Panel  
Connections (Paragraph 5.2), Error Code Troubleshooting (Paragraph 5.3),  
General Maintenance (Paragraph 5.4), Fuse Replacement (Paragraph 5.5),  
Line Voltage Selection (Paragraph 5.6), Calibration (Paragraph 5.7), and  
Serial Interface Cable and Adapters (Paragraph 5.8).  
5.1  
MODEL CYD201 REAR PANEL CONNECTIONS  
Figure 5-1. Model CYD201 Rear Panel Connections  
J1 INPUT 1: Accepts circular 4-pin connector temperature sensor (201-MC).  
J2 SERIAL I/O: RJ-11 jack for serial remote communications to a host  
computer. May require accessories CYD200-J10 (RJ-11 phone cord) and  
CYD200-D (RJ-11 to DB-25 adapter).  
J3 ALARM: Relay responds to alarm setpoints and can trigger another  
device. Contact 1 is normally open, contact 2 is normally closed.  
Switch: Not used.  
LATCH switch: When on (position 1), turns alarm on but not off (latched) as  
indicated by temperature change. When off (position 0), turns alarm off or  
on (unlatched).  
SET switch: Used in setting alarm setpoints and recalibration.  
CAL ENABLE (Calibration Enable) pushbutton: Used during A/D Converter  
Calibration. See Paragraph 5.7.2.  
I ADJ (Current Adjust) trim potentiometer: Used during Current Source  
Calibration. See Paragraph 5.7.1.  
Service  
5-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5.2  
MODEL CYD208 REAR PANEL CONNECTIONS  
Figure 5-2. Model CYD208 Rear Panel Connections  
J1 INPUTS: Accepts 36-pin “D” style connector (208-MC) and multi-sensor  
adapters. Adapter sits on top of thermometer and accepts up to 8  
temperature sensors. Adapter designed for either circular 4-pin (2084) or  
stripped wire (2081) sensors.  
J2 SERIAL I/O: RJ-11 jack for serial remote communications to a host  
computer. May require accessories CYD200-J10 (RS-232C phone cord)  
and CYD200-D (RJ-11 to DB-25 adapter).  
J3 ALARM: Relay responds to alarm setpoints and can trigger another  
device. Contact 1 is normally open, contact 2 is normally closed.  
FIX switch: Switches alarm functions between monitoring all channels  
(position 0) or monitoring channel 1 only (position 1).  
LATCH switch: When on (position 1), turns alarm on but not off (latched) as  
indicated by temperature change. When off (position 0), turns alarm off or  
on (unlatched).  
SET switch: Used in setting alarm setpoints and recalibration.  
CAL ENABLE (Calibration Enable) pushbutton: Used during A/D Converter  
Calibration. See Paragraph 5.7.2.  
I ADJ (Current Adjust) trim potentiometer: Used during Current Source  
Calibration. See Paragraph 5.7.1.  
5-2  
Service  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5.3  
ERROR CODE TROUBLESHOOTING  
On power up, the CYD201/CYD208 checks internal memory. If a problem  
exists, an error message displays on the front panel of the instrument.  
Er01 indicates a hardware problem in the instrument memory. This error is  
not user-correctable.  
Er02 indicates a soft error in the instrument memory. To correct this error,  
use the following procedure.  
1. Power up the unit and allow it to display Er02.  
2. Close DIP Switch 1 (top of the switch pressed in). Leave the switch  
closed for at least 5 seconds, then open DIP switch 1 (bottom of the  
switch pressed in).  
3. Verify the Model CYD201/CYD208 display goes through a normal power  
up sequence and then displays 499.9 K.  
4. The input(s) of the Model CYD201/CYD208 must now be recalibrated  
per in procedure in Paragraph 5.7 before the unit can be used.  
OL indicates a voltage input overload. This can be caused by an open  
sensor or diode sensor wired backwards.  
Before calling the factory about a persistent problem, try the procedure  
below:  
WARNING: This procedure erases calibration constants stored in Non-  
Volatile RAM. If this procedure is used, recalibrate the instrument.  
1. With power turned Off, press and hold CAL ENABLE on the back panel.  
While holding CAL ENABLE, turn instrument power On.  
2. If the Model CYD201/CYD208 displays Er02, follow the Calibration  
procedure in Paragraph 5.7. If Er01 still displays or if the Model  
CYD201/CYD208 does not respond, contact OMEGA Service.  
5.4  
GENERAL MAINTENANCE  
Clean the CYD201/CYD208 periodically to remove dust, grease and other  
contaminants. Clean the front and back panels and case with a soft cloth  
dampened with a mild detergent and water solution.  
NOTE: Do not use aromatic hydrocarbons or chlorinated solvents to clean  
the Model CYD201/CYD208. They may react with the silk screen printing on  
the back panel.  
Service  
5-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5.5  
FUSE REPLACEMENT  
WARNING: To prevent shock hazard, turn off instrument and  
disconnect it from AC line power and all test equipment before  
replacing fuse.  
1. Turn POWER switch Off and disconnect power cord from unit.  
Disconnect all test equipment from unit.  
2. Remove all screws from rear panel. Gently pull away rear panel and  
remove enclosure cover by sliding it to the back.  
3. Remove fuse with a fuse puller. The fuse is located behind the  
transformer as shown in Figure 5.3.  
4. Replace with a 0.2 A fuse for 110 V (115 VAC) operation or a 0.1 A fuse  
for 220 V (230 VAC) operation. Use slow blow fuses.  
CAUTION: Replace fuse with the same type and rating as specified by  
the line voltage selected.  
5. Replace enclosure cover, rear panel, and all screws.  
5.6  
Line Voltage Configuration  
The rear-panel, 3-pronged line power connector permits Model  
CYD201/CYD208 operation at either 110 or 220 VAC. The configuration is  
indicated on rear panel in the Line Voltage Selection Block. Use the  
procedure below to change line voltage.  
WARNING: To prevent shock hazard, turn off instrument and  
disconnect it from AC line power and all test equipment before  
changing line voltage configuration.  
1. Turn power switch OFF and disconnect the power cord from the unit.  
Disconnect all test equipment from unit.  
2. Remove all screws from rear  
panel. Gently pull away rear  
panel and remove enclosure  
cover by sliding it to the back.  
3. Modify jumper configuration to  
desired line voltage (see  
Figure 5-3).  
4. Replace fuse to match new  
voltage requirements.  
5. Replace enclosure cover, rear  
panel and all screws.  
Figure 5-3 Line Voltage  
Jumper Configuration  
5-4  
Service  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5.7  
RECALIBRATION  
OMEGA calibrates and certifies thermometers to original factory  
specifications for a reasonable fee. You can recalibrate the thermometer to  
original specifications, but OMEGA will not warrant these calibrations.  
Recalibration requires a digital voltmeter (DVM) with 4½ digit resolution or  
better; and 25 k and 125 k precision resistors with ±0.01% tolerance or  
better.  
Recalibration involves current source and analog/digital (A/D) converter  
calibration. A/D calibration erases all SoftCal™ compensations; perform it  
after current source calibration, not before.  
5.7.1 Current Source Calibration  
1. Allow 30 minute warm-up to achieve rated specifications.  
2. Configure 125 k resistor as shown in Figure 5-4. Set Model CYD208 to  
channel 1.  
3. Connect DVM voltage leads across the resistor and adjust the I ADJ  
trimpot (located on rear panel) until DVM displays a voltage of 1.2500  
volts ±100 microvolts.  
4. Remove DVM and resistor.  
Model CYD201  
Model CYD208  
NOTE: Do not use a voltmeter for A/D Converter Calibration.  
Figure 5-4. Calibration Connections  
Service  
5-5  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5.7.2 A/D Converter Calibration  
NOTE: Current source calibration must be performed before A/D converter  
calibration.  
1. Allow 30 minute warm-up to achieve rated specifications.  
2. Perform current source calibration.  
3. Configure 125 k resistor as shown in Figure 5-4. Set Model 208s to  
channel 1.  
4. Wait 10 seconds for resistor voltage to settle.  
5. Press CAL ENABLE, then within 2 seconds press UNITS. The display  
window shows "-CAL-" for approximately 15 seconds.  
6. Repeat procedure with 25 k resistor.  
7. For Model CYD208, repeat procedure for other 7 channels. See  
Figure 2-2 for pin assignments.  
5.8  
SERIAL INTERFACE CABLE AND ADAPTERS  
TxD  
Gnd  
Gnd  
RxD  
YELLOW  
GREEN  
RED  
BLACK  
Figure 5-5. Model CYD200-J10 RJ-11 Cable Assembly Wiring Details  
13  
12  
11  
10  
9
8
7
6
5
4
3
2
1
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
DB-25 CONNECTOR  
= NOT  
RxD  
Gnd  
TxD  
USED  
1
2
3
4
5
6
RJ-11  
RECEPTACLE  
Figure 5-6. Model CYD200-D RJ-11 to DB-25 Adapter Wiring Details  
5-6  
Service  
 
OMEGA Model CYD201/CYD208 User’s Manual  
5
4
3
2
1
9
8
7
6
DE-9 CONNECTOR  
= NOT  
USED  
RxD  
Gnd  
TxD  
1
2
3
4
5
6
RJ-11  
RECEPTACLE  
Figure 5-7. Model CYD200-B RJ-11 to DE-9 Adapter Wiring Details  
Service  
5-7  
 
OMEGA Model CYD201/CYD208 User’s Manual  
This Page Intentionally Left Blank  
5-8  
Service  
 
OMEGA Model CYD201/CYD208 User’s Manual  
CHAPTER 6  
OPTIONS AND ACCESSORIES  
6.0  
GENERAL  
This chapter lists options, accessories, sensors, wires, and special  
equipment available for the Model CYD201/CYD208.  
6.1  
ACCESSORIES  
MODEL  
DESCRIPTION OF ACCESSORY  
4-pin Mating Connector for Model CYD201 and Model  
2084.  
201-MC  
36-pin “D” Style Connector for Model CYD208.  
208-MC  
RJ-11 to RJ-11 Phone Cord, 10 feet (3 meters). See  
Figure 6-1.  
CYD200-J10  
CYD200-D  
CYD200-B  
RJ-11 to DB-25 Adapter. Connects RJ-11 to RS-232C  
Serial Port on rear of computer. See Figure 6-1.  
RJ-11 to DE-9 Adapter. Connects RJ-11 to RS-232C  
Serial Port on rear of computer. See Figure 6-1.  
Model CYD201 calibration connector.  
Model CYD208 calibration connector.  
2010  
2080  
Screw Terminal Adapter. Connects Model CYD208 to  
multiple sensor/probe assemblies with stripped ends  
and non- permanent wiring. Provision for attachment to  
top of thermometer. Fitted with “D” type mating  
connector.  
2081  
Stainless steel Sensor Probe with 6-foot (1.83 m) cable  
with 4 stripped ends. 4-inch (10 cm) long by 1/8 inch  
(3.2 mm) diameter probe.  
2082-1  
2082-2  
2082-3  
2082-4  
Stainless steel Sensor Probe with 6-foot (1.83 m) cable  
with 4-pin 201-MC mating connector. 4-inch (10 cm)  
long by 1/8 inch (3.2 mm) diameter probe.  
Stainless steel Sensor Probe with 12-foot (3.7 m) cable  
with 4 stripped ends. 6-inch (15 cm) long by 1/8 inch  
(3.2 mm) diameter probe.  
Stainless steel Sensor Probe with 12-foot (3.7 m) cable  
with 4-pin 201-MC mating connector. 6-inch (15 cm)  
long by 1/8 inch (3.2 mm) diameter probe.  
Options and Accessories  
6-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
ACCESSORIES (continued)  
MODEL  
DESCRIPTION OF ACCESSORY  
Sensor Probe. 12-foot (3.7 m) cable with CY-7-SD-13  
sensor in CY mounting adapter, stripped ends. Tempera-  
ture limit: 325 K (52 °C). Diode sensor epoxied (Stycast)  
into center of 0.564 inch (1.43 cm) diameter by 0.20 inch  
(5 mm) thick copper disk. 30 AWG copper leads anchored  
to disk. Mass (excluding leads): 4.3 grams.  
2083-1  
Sensor Probe. 12-foot (3.7 m) cable with CY-7-SD-13  
sensor in CY mounting adapter, with 4-pin CYD201-MC  
mating connector. Temperature limit: 325 K (52 °C). Diode  
sensor epoxied (Stycast) into center of 0.564 inch (1.43  
cm) diameter by 0.20 inch (5 mm) thick copper disk. 30  
AWG copper leads anchored to disk. Mass (excluding  
leads): 4.3 grams.  
2083-2  
2084  
Multi-Connector Adapter. Required with Model CYD208  
when using multiple probe/cable assemblies and Model  
201-MC mating connectors.  
Mounting Adapter for Rack Installation. For installation in  
a ¼ panel EIA rack space. See Figure 2-3.  
CYD208  
-DIN  
6.2  
MODEL CYD201/CYD208 WIRES  
LSCI P/N  
DESCRIPTION OF CABLE  
Quad-Twist™ Cryogenic Wire. Two twisted pairs,  
phosphor-bronze wire, 36 AWG, 0.127 mm (0.005 inch)  
diameter.  
9001-005  
Duo-Twist™ Cryogenic Wire. Single twisted pair,  
phosphor-bronze wire, 36 AWG, 0.127 mm (0.005 inch)  
diameter.  
9001-006  
9001-007  
Quad-Lead™ Cryogenic Wire. Phosphor-bronze wire,  
flat, 32 AWG, 0.203 mm (0.008 inch) diameter.  
Quad-Lead™ Cryogenic Wire. Phosphor-bronze wire,  
flat, 32 AWG, 0.127 mm (0.005 inch) diameter.  
9001-008  
—
Any quality dual shield twisted pair wire for dewar to  
Model CYD201/CYD208 connector.  
6-2  
Options and Accessories  
 
OMEGA Model CYD201/CYD208 User’s Manual  
6.3  
MODEL CYD201/CYD208 SENSORS  
SENSOR NO.  
Series DT-420  
DESCRIPTION OF SENSOR  
The smallest silicon diode Temperature Sensor  
available. Installs on flat surfaces. Same silicon  
chip as Series CY-7 and DT-471.  
Silicon Diode Miniature Temperature Sensor. Same  
silicon chip as CY-7 designed to install in recesses  
as small as 1.6 mm dia. by 3.2 mm deep.  
Series DT-450  
Series CY-7  
Silicon Diode Temperature Sensor. Repeatable,  
interchangeable, accurate, wide range, customized  
for cryogenics.  
An economical version of the CY-7 for applications  
where temperature measurements below 10 K are  
not required.  
Series DT-471  
Model CYD200-B RJ-11  
to DB-25 Adapter  
J2 SERIAL I/O  
RS-232C  
Interface Output  
on rear of Model  
CYD201 or  
CYD208  
Use whichever adapter that  
matches your computer  
serial interface connector  
Model CYD200-B  
RJ-11 to DE-9 Adapter  
Model CYD200-J10  
RJ-11 Cable Assembly  
Figure 6-1. Serial Interface Adapters  
Options and Accessories  
6-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
This Page Intentionally Left Blank  
6-4  
Options and Accessories  
 
OMEGA Model CYD201/CYD208 User’s Manual  
APPENDIX A  
CURVE TABLES  
A1.0 GENERAL  
The following curve tables apply to the Model CYD201/CYD208: Curve 0 -  
DT-500DI-8B (Table A-1), Curve 1 - DT-500DI-8A (Table A-2), Curve 2 -  
DT-500DRC-D (Table A-3), Curve 3 - DT-500DRC-E1 (Table A-4), Curve 4 -  
CTI Curve C (Table A-5), Curve 5 - DT-500DI-8C (Table A-6), and Curve 6 -  
CY-7 Curve 10 (Table A-7).  
Table A-1. Curve 0: DT-500DI-8B Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
BP #  
29  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.5  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
9.5  
10.0  
11.0  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
18.0  
19.0  
20.0  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
2.41773  
2.40475  
2.39217  
2.37946  
2.36668  
2.35378  
2.32126  
2.28869  
2.25643  
2.22480  
2.19395  
2.16053  
2.13552  
2.10809  
2.08197  
2.05687  
2.00852  
1.96003  
1.90579  
1.85614  
1.80479  
1.74703  
1.67479  
1.60665  
1.53675  
1.46370  
1.38832  
1.31868  
1.26476  
1.21712  
1.17857  
1.15106  
1.13317  
1.12169  
19  
18  
17  
16  
15  
29.0  
30.0  
32.0  
34.0  
36.0  
38.0  
40.0  
45.0  
50.0  
55.0  
60.0  
65.0  
70.0  
75.0  
77.4  
80.0  
85.0  
90.0  
95.0  
100.0 0.92767  
105.0 0.91443  
110.0 0.90124  
115.0 0.88776  
120.0 0.87434  
125.0 0.86087  
130.0 0.84735  
135.0 0.83377  
140.0 0.82032  
145.0 0.80647  
150.0 0.79274  
155.0 0.77896  
160.0 0.76513  
165.0 0.75125  
1.11353  
170.0 0.73733  
175.0 0.72353  
180.0 0.70936  
185.0 0.69532  
190.0 0.68125  
195.0 0.66713  
200.0 0.65302  
205.0 0.63889  
210.0 0.62475  
215.0 0.61066  
220.0 0.59646  
225.0 0.58262  
230.0 0.56877  
235.0 0.55504  
240.0 0.54136  
245.0 0.52801  
250.0 0.51469  
255.0 0.50155  
260.0 0.48815  
265.0 0.47486  
270.0 0.46148  
275.0 0.44800  
280.0 0.43451  
285.0 0.42064  
290.0 0.40675  
295.0 0.39274  
300.0 0.37875  
305.0 0.36436  
310.0 0.35002  
315.0 0.33559  
320.0 0.32109  
325.0 0.30656  
330.0 0.29222  
1.10729  
1.09810  
1.09125  
1.08547  
1.08038  
1.07549  
1.06400  
1.05273  
1.04123  
1.02954  
1.01748  
1.00528  
0.99263  
0.98666  
0.97988  
0.96711  
0.95397  
0.94086  
7
14  
13  
12  
11  
6
28  
5
4
10  
9
27  
26  
3
2
25  
8
24  
23  
22  
21  
20  
1
Appendix A  
A-1  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-2. Curve 1: DT-500DI-8A Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
Temp.  
(K)  
PROM  
Voltage  
BP #  
BP #  
30  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.5  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
9.5  
10.0  
11.0  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
18.0  
19.0  
20.0  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
2.46386  
2.44821  
2.43188  
2.41500  
2.39781  
2.37578  
2.33823  
2.29906  
2.26440  
2.23248  
2.20480  
2.17716  
2.14994  
2.12245  
2.10065  
2.07844  
2.03712  
1.99736  
1.95641  
1.91202  
1.85236  
1.79177  
1.73193  
1.66870  
1.59215  
1.51169  
1.43234  
1.34993  
1.28434  
1.23212  
1.18995  
1.16027  
1.14015  
1.12689  
17  
16  
15  
14  
13  
12  
29.0  
30.0  
32.0  
34.0  
36.0  
38.0  
40.0  
45.0  
50.0  
55.0  
60.0  
65.0  
70.0  
75.0  
77.4  
80.0  
85.0  
90.0  
95.0  
100.0 0.92166  
105.0 0.90798  
110.0 0.89426  
115.0 0.88052  
120.0 0.86676  
125.0 0.85298  
130.0 0.83936  
135.0 0.82531  
140.0 0.81142  
145.0 0.79749  
150.0 0.78351  
155.0 0.76950  
160.0 0.75544  
165.0 0.74135  
1.11741  
1.11007  
1.09942  
1.09178  
1.08559  
1.07992  
1.07502  
1.06307  
1.05136  
1.03951  
1.02744  
1.01475  
1.00193  
0.98892  
0.98264  
0.97557  
0.96216  
0.94877  
0.93535  
7
170.0 0.72739  
175.0 0.71308  
180.0 0.69891  
185.0 0.68469  
190.0 0.67043  
195.0 0.65615  
200.0 0.64185  
205.0 0.62754  
210.0 0.61333  
215.0 0.59901  
220.0 0.58502  
225.0 0.57099  
230.0 0.55715  
235.0 0.54327  
240.0 0.52983  
245.0 0.51639  
250.0 0.50302  
255.0 0.48965  
260.0 0.47625  
265.0 0.46292  
270.0 0.44925  
275.0 0.43559  
280.0 0.42178  
285.0 0.40797  
290.0 0.39375  
295.0 0.37951  
300.0 0.36515  
305.0 0.35078  
310.0 0.33599  
315.0 0.32121  
320.0 0.30643  
325.0 0.29159  
330.0 0.27665  
29  
28  
27  
6
5
11  
10  
9
26  
25  
4
3
2
8
24  
23  
22  
21  
20  
19  
18  
1
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-3. Curve 2: DT-500DRC-D Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
BP #  
1.4  
1.5  
1.6  
1.7  
1.8  
1.9  
2.0  
2.2  
2.4  
2.6  
2.8  
3.0  
3.2  
3.4  
3.6  
3.8  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.5  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
9.5  
2.5984  
2.5958  
2.5932  
2.5906  
2.5880  
2.5854  
2.5828  
2.5735  
2.5643  
2.5551  
2.5458  
2.5366  
2.5226  
2.5086  
2.4946  
2.4807  
2.4667  
2.4527  
2.4387  
2.4247  
2.4108  
2.3968  
2.3618  
2.3269  
2.2919  
2.2570  
2.2220  
2.1871  
2.1521  
2.1172  
2.0909  
2.0646  
2.0119  
1.9592  
1.9066  
1.8338  
1.7610  
1.6984  
1.6359  
1.5646  
1.4932  
1.4219  
24  
23  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
29.0  
30.0  
32.0  
34.0  
36.0  
38.0  
40.0  
45.0  
50.0  
55.0  
60.0  
65.0  
70.0  
75.0  
80.0  
85.0  
90.0  
95.0  
100.0 0.92647  
105.0 0.91307  
110.0 0.89966  
115.0 0.88626  
120.0 0.87286  
125.0 0.85946  
130.0 0.84606  
135.0 0.83228  
140.0 0.81850  
145.0 0.80472  
150.0 0.79094  
155.0 0.77716  
160.0 0.76338  
165.0 0.74961  
170.0 0.73582  
175.0 0.72170  
1.3505  
1.3006  
1.2507  
1.2114  
1.1720  
1.1486  
1.1308  
1.1190  
1.1116  
1.1058  
1.0970  
1.0902  
1.0850  
1.0798  
1.0746  
1.0633  
1.0520  
1.0407  
1.0287  
1.0166  
1.0046  
0.99172  
0.97890  
0.96609  
0.95327  
0.93987  
180.0 0.70757  
185.0 0.69344  
190.0 0.67931  
195.0 0.65518  
200.0 0.65105  
205.0 0.63693  
210.0 0.62280  
215.0 0.60867  
220.0 0.59455  
225.0 0.58080  
230.0 0.56707  
235.0 0.55334  
240.0 0.53960  
245.0 0.52649  
250.0 0.51337  
255.0 0.50026  
260.0 0.48714  
265.0 0.47403  
270.0 0.46057  
275.0 0.44711  
280.0 0.43365  
285.0 0.42019  
290.0 0.40613  
295.0 0.39208  
300.0 0.37802  
305.0 0.36397  
310.0 0.34940  
315.0 0.33482  
320.0 0.32025  
325.0 0.30568  
330.0 0.29111  
335.0 0.27654  
340.0 0.26197  
345.0 0.24739  
350.0 0.23325  
355.0 0.21911  
360.0 0.20497  
365.0 0.19083  
370.0 0.17774  
375.0 0.16464  
380.0 0.15155  
22  
21  
20  
19  
18  
17  
16  
15  
30  
29  
8
7
14  
13  
12  
6
5
4
11  
10  
9
28  
10.0  
11.5  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
18.0  
19.0  
20.0  
3
27  
26  
25  
2
1
Appendix A  
A-3  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-4. Curve 3: DT-500DRC-E1 Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
BP #  
30  
1.4  
1.5  
1.6  
1.7  
1.8  
1.9  
2.0  
2.2  
2.4  
2.6  
2.8  
3.0  
3.2  
3.4  
3.6  
3.8  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.5  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
9.5  
10.0  
11.0  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
2.6591  
2.6567  
2.6542  
2.6518  
2.6494  
2.6470  
2.6446  
18.0  
19.0  
20.0  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
29.0  
30.0  
32.0  
34.0  
36.0  
38.0  
40.0  
45.0  
50.0  
55.0  
60.0  
65.0  
70.0  
75.0  
77.35  
80.0  
85.0  
90.0  
95.0  
100.0  
105.0  
110.0  
115.0  
120.0  
125.0  
130.0  
135.0  
140.0  
1.6527  
1.5724  
1.4922  
1.4120  
1.3317  
145.0  
150.0  
155.0  
160.0  
165.0  
170.0  
175.0  
180.0  
185.0  
190.0  
195.0  
200.0  
205.0  
210.0  
215.0  
220.0  
225.0  
230.0  
235.0  
240.0  
245.0  
250.0  
255.0  
260.0  
265.0  
270.0  
275.0  
280.0  
285.0  
290.0  
295.0  
300.0  
305.0  
310.0  
315.0  
320.0  
325.0  
330.0  
0.8035  
0.7896  
0.7758  
0.7620  
0.7482  
0.7344  
0.7202  
0.7060  
0.6918  
0.6777  
0.6635  
0.6493  
0.6351  
0.6210  
0.6068  
0.5926  
0.5789  
0.5651  
0.5514  
0.5377  
0.5246  
0.5115  
0.4984  
0.4853  
0.4722  
0.4588  
0.4454  
0.4320  
0.4186  
0.4045  
0.3904  
0.3763  
0.3622  
0.3476  
0.3330  
0.3184  
0.3038  
0.2893  
1.2837  
1.2357  
1.1877  
1.1559  
1.1365  
1.1239  
1.1150  
1.1080  
1.0981  
1.0909  
1.0848  
1.0797  
1.0746  
1.0630  
1.0515  
1.0399  
1.0284  
1.0159  
1.0035  
0.9911  
0.9849  
0.9780  
0.9649  
0.9518  
0.9388  
0.9257  
0.9122  
0.8988  
0.8853  
0.8718  
0.8584  
0.8449  
0.8311  
0.8173  
7
29  
28  
27  
2.6355  
2.6265  
2.6175  
2.6084  
2.5994  
2.5868  
2.5742  
2.5616  
2.5490  
2.5364  
2.5221  
2.5077  
2.4934  
2.4791  
2.4648  
2.4290  
2.3932  
2.3574  
2.3216  
2.2858  
2.2500  
2.2142  
2.1784  
2.1516  
2.1247  
2.0708  
2.0170  
1.9632  
1.9011  
1.8390  
1.7769  
1.7148  
21  
20  
19  
18  
17  
16  
15  
14  
13  
6
12  
11  
4
3
2
26  
25  
9
8
1
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-5. Curve 4: CTI Diode Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
BP #  
29  
28  
27  
10.0  
11.0  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
18.0  
19.0  
20.0  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
29.0  
30.0  
32.0  
34.0  
36.0  
38.0  
40.0  
45.0  
50.0  
1.4000  
55.0  
60.0  
65.0  
70.0  
75.0  
77.4  
80.0  
85.0  
90.0  
1.0235  
190.0  
195.0  
200.0  
205.0  
210.0  
215.0  
220.0  
225.0  
230.0  
235.0  
240.0  
245.0  
250.0  
255.0  
260.0  
265.0  
270.0  
275.0  
280.0  
285.0  
290.0  
295.0  
300.0  
305.0  
310.0  
315.0  
320.0  
0.6545  
0.6408  
0.6270  
0.6133  
0.5995  
0.5858  
0.5720  
0.5583  
0.5445  
0.5308  
0.5170  
0.5032  
0.4896  
0.4757  
0.4620  
0.4481  
0.4341  
0.4197  
0.4050  
0.3911  
0.3775  
0.3640  
0.3510  
0.3382  
0.3243  
0.3106  
0.2968  
1.3850  
1.3656  
1.3400  
1.3161  
1.2750  
1.2350  
1.1910  
1.1500  
1.1290  
1.1162  
1.1135  
1.1109  
1.1084  
1.1058  
1.1033  
1.1007  
1.0981  
1.0955  
1.0929  
1.0903  
1.0851  
1.0799  
1.0747  
1.0693  
1.0640  
1.0505  
1.0370  
21  
20  
1.0100  
0.9958  
0.9822  
0.9690  
0.9626  
0.9560  
0.9440  
0.9314  
0.9184  
0.9049  
0.8907  
0.8769  
0.8625  
0.8500  
0.8376  
0.8245  
0.8109  
0.7971  
0.7828  
0.7685  
0.7543  
0.7400  
0.7255  
0.7114  
0.6972  
0.6830  
0.6690  
8
26  
19  
18  
17  
16  
15  
25  
24  
23  
95.0  
100.0  
105.0  
110.0  
115.0  
120.0  
125.0  
130.0  
135.0  
140.0  
145.0  
150.0  
155.0  
160.0  
165.0  
170.0  
175.0  
180.0  
185.0  
14  
13  
7
6
12  
11  
10  
9
5
4
3
2
22  
1
Appendix A  
A-5  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-6. Curve 5: DT-500DI-8C Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
BP #  
29  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.2  
5.4  
5.6  
5.8  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
2.6187  
2.6074  
2.5956  
2.5834  
2.5709  
2.5580  
2.5484  
2.5312  
2.5173  
2.5033  
2.4890  
2.4524  
2.4151  
2.3773  
2.3394  
2.2976  
2.2643  
2.2277  
2.1919  
2.1566  
2.1221  
2.0881  
2.0545  
2.0211  
1.9875  
1.9537  
1.9193  
1.8843  
1.8480  
1.8110  
1.7748  
1.7441  
1.7047  
1.6702  
1.6361  
1.6022  
1.5676  
1.5316  
1.4950  
1.4218  
1.3461  
1.2840  
23  
22  
21  
20  
19  
18  
17  
16  
24.0  
25.0  
26.0  
27.0  
28.0  
29.0  
30.0  
31.0  
32.0  
33.0  
34.0  
35.0  
36.0  
37.0  
38.0  
39.0  
40.0  
42.0  
44.0  
46.0  
48.0  
50.0  
52.0  
54.0  
56.0  
58.0  
60.0  
65.0  
70.0  
75.0  
77.4  
80.0  
85.0  
90.0  
95.0  
100.0  
105.0  
110.0  
115.0  
120.0  
125.0  
130.0  
1.2317  
1.1900  
1.1602  
135.0  
140.0  
145.0  
150.0  
155.0  
160.0  
165.0  
170.0  
175.0  
180.0  
185.0  
190.0  
195.0  
200.0  
205.0  
210.0  
215.0  
220.0  
225.0  
230.0  
235.0  
240.0  
245.0  
250.0  
255.0  
260.0  
265.0  
270.0  
275.0  
280.0  
285.0  
290.0  
295.0  
300.0  
305.0  
310.0  
315.0  
320.0  
325.0  
330.0  
0.8377  
0.8243  
0.8108  
0.7974  
0.7837  
0.7701  
0.7564  
0.7427  
0.7289  
0.7152  
0.7013  
0.6874  
0.6734  
0.6595  
0.6455  
0.6315  
0.6176  
0.6036  
0.5898  
0.5761  
0.5625  
0.5490  
0.5358  
0.5226  
0.4096  
0.4966  
0.4836  
0.4705  
0.4574  
0.4442  
0.4307  
0.4171  
0.4035  
0.3898  
0.3758  
0.3618  
0.3477  
0.3336  
0.3194  
0.3054  
1.1402  
1.1269  
1.1173  
1.1100  
1.1039  
1.0991  
1.0949  
1.0913  
1.0879  
1.0850  
1.0822  
1.0795  
1.0770  
1.0746  
1.0697  
1.0649  
1.0603  
1.0558  
1.0512  
1.0467  
1.0421  
1.0376  
1.0330  
1.0285  
1.0168  
1.0049  
0.9930  
0.9870  
0.9805  
0.9680  
0.9553  
0.9427  
0.9297  
0.9168  
0.9038  
0.8907  
0.8777  
0.8643  
0.8510  
7
6
28  
27  
15  
14  
13  
12  
9.5  
5
4
10.0  
10.5  
11.0  
11.5  
12.0  
12.5  
13.0  
13.5  
14.0  
14.5  
15.0  
15.5  
16.0  
16.5  
17.0  
17.5  
18.0  
18.5  
19.0  
19.5  
20.0  
21.0  
22.0  
23.0  
11  
10  
3
2
26  
9
8
1
25  
24  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-7. Curve 6: CY-7 Voltage-Temp. Characteristics  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
Temp.  
(K)  
PROM  
Voltage  
BP #  
BP #  
13  
29  
1.4  
1.5  
1.6  
1.7  
1.8  
1.9  
2.0  
2.1  
2.2  
2.3  
2.4  
2.5  
2.6  
2.7  
2.8  
2.9  
3.0  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
3.7  
3.8  
3.9  
4.0  
4.2  
4.4  
4.6  
4.8  
5.0  
5.2  
5.4  
5.6  
5.8  
6.0  
6.5  
7.0  
7.5  
8.0  
8.5  
9.0  
9.5  
10.0  
10.5  
11.0  
11.5  
1.69808  
1.69674  
1.69521  
1.69355  
1.69177  
1.68987  
1.68912  
1.68574  
1.68352  
1.68121  
1.67880  
1.67632  
1.67376  
1.67114  
1.66845  
1.66571  
1.66292  
1.66009  
1.65721  
1.65430  
1.65134  
1.64833  
1.64529  
1.64219  
1.64112  
1.63587  
1.63263  
1.62602  
1.61920  
1.61220  
1.60506  
1.59782  
1.59047  
1.58303  
1.57551  
1.56792  
1.56027  
1.54097  
1.52166  
1.50272  
1.48443  
1.46700  
1.44850  
1.43488  
1.42013  
1.40615  
1.39287  
1.38021  
25  
12.0  
12.5  
13.0  
13.5  
14.0  
14.5  
15.0  
15.5  
16.0  
16.5  
17.0  
17.5  
18.0  
18.5  
19.0  
19.5  
20.0  
21.0  
22.0  
23.0  
24.0  
25.0  
26.0  
27.0  
28.0  
29.0  
30.0  
31.0  
32.0  
33.0  
34.0  
35.0  
36.0  
37.0  
38.0  
39.0  
40.0  
42.0  
44.0  
46.0  
48.0  
50.0  
52.0  
54.0  
56.0  
58.0  
60.0  
65.0  
1.36687  
1.35647  
1.34530  
1.33453  
1.32412  
1.31403  
1.30422  
1.29340  
1.28527  
1.27607  
1.26702  
1.25810  
1.24928  
1.24053  
1.23184  
1.22314  
1.21555  
1.19645  
1.17705  
1.15558  
1.13598  
1.12463  
1.11896  
1.11517  
1.11202  
1.10945  
1.10702  
1.10465  
1.10263  
1.10060  
1.09864  
1.09675  
1.09477  
1.09309  
1.09131  
1.08955  
1.08781  
1.08436  
1.08105  
1.07748  
1.07402  
1.07053  
1.06700  
1.06346  
1.05988  
1.05629  
1.05277  
1.04353  
70.0  
75.0  
77.4  
80.0  
85.0  
90.0  
95.0  
1.03425  
1.02482  
1.02044  
1.01525  
1.00552  
0.99565  
0.98574  
28  
27  
26  
12  
24  
100.0 0.97550  
105.0 0.96524  
110.0 0.95487  
115.0 0.94455  
120.0 0.93383  
125.0 0.92317  
130.0 0.91243  
135.0 0.90161  
140.0 0.89082  
145.0 0.87976  
150.0 0.86873  
155.0 0.85764  
160.0 0.84650  
165.0 0.83541  
170.0 0.82404  
175.0 0.81274  
180.0 0.80138  
185.0 0.78999  
190.0 0.77855  
195.0 0.76717  
200.0 0.75554  
205.0 0.74398  
210.0 0.73238  
215.0 0.72075  
220.0 0.70908  
225.0 0.69737  
230.0 0.68580  
235.0 0.67387  
240.0 0.66208  
245.0 0.65026  
250.0 0.63841  
255.0 0.62654  
260.0 0.61465  
265.0 0.60273  
270.0 0.59080  
275.0 0.57886  
280.0 0.56707  
285.0 0.55492  
290.0 0.54294  
295.0 0.53093  
300.0 0.51892  
11  
10  
9
23  
22  
21  
20  
19  
18  
8
7
17  
16  
15  
14  
6
Appendix A  
A-7  
 
OMEGA Model CYD201/CYD208 User’s Manual  
Table A-7. Curve 6: CY-7 Voltage-Temp. Characteristics (Continued)  
Temp.  
(K)  
PROM  
Voltage BP #  
Temp.  
(K)  
PROM  
Voltage  
Temp.  
(K)  
PROM  
Voltage  
BP #  
BP #  
305.0 0.50689  
310.0 0.49484  
315.0 0.48278  
320.0 0.47069  
325.0 0.45858  
330.0 0.44647  
335.0 0.43435  
340.0 0.42238  
345.0 0.41003  
350.0 0.39783  
355.0 0.38561  
360.0 0.37337  
365.0 0.36110  
370.0 0.34881  
375.0 0.33650  
380.0 0.32416  
385.0 0.31180  
390.0 0.29958  
395.0 0.28700  
400.0 0.27456  
405.0 0.26211  
410.0 0.24963  
415.0 0.23714  
420.0 0.22463  
425.0 0.21212  
430.0 0.19961  
435.0 0.18696  
440.0 0.17464  
445.0 0.16221  
450.0 0.14985  
455.0 0.13759  
460.0 0.12536  
465.0 0.11356  
470.0 0.10191  
475.0 0.09032  
3
4
5
2
1
 
NOTES  
 
NOTES  
 
TEMPERATURE  
Thermocouple, RTD & Thermistor Probes & Assemblies  
Connector Systems and Panels  
Wire: Thermocouple, RTD, and Thermistor  
Calibrators and Ice Point References  
Recorders, Controllers, and Process Monitors  
Data Acquisition Modules and Data Loggers  
Computer Sensor Interface  
PRESSURE/STRAIN  
Transducers  
Strain Gauges  
Load Cells  
Pressure Gauges  
Instrumentation  
FLOW  
Rotameters  
Flowmeter Systems  
Air Velocity Indicators  
Turbine/Paddlewheel Systems  
Vortex Meters and Flow Computers  
pH  
Electrodes  
Benchtop/Laboratory Meters  
Controllers  
Calibrators/Simulators  
Transmitters  
 
 

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