Omega Thermometer HH804U User Manual

OPERATING INSTRUCTIONS  
INTRODUCTION  
This instrument is a 4_ digit, compact-sized portable digital thermometer  
designed to use external 100_ Platinum RTD as temperature sensor. Tem-  
perature indication follows Reference Temperature/Resistance Tables (Pt385  
for European Curve, Alpha=.00385. Pt3926 for American Curve, Al  
pha=.003926. Pt3916 for Japan Curve, Alpha=.003916.)  
1.  
Power Button  
The  
button turns the thermometer on or off. In the SET mode the unit  
cannot be powered off. Exit the SET mode to power off.  
APO function mode  
Press “ ” power button for more than 6 seconds to disable auto power  
function. The display will show “APO OFF”.  
SAFETY INFORMATION  
OPERATING INSTRUCTIONS  
HH804U  
DUAL INPUT RTD THERMOMETER  
2.°C/°F Selecting the Temperature Scale (Main display)  
Readings are displayed in either degrees Celsius(°C) or degrees Fahren-  
heit(°F). When the thermometer is turned on, it is set to the temperature  
scale that was in use when the thermometer was last turned off. To change  
the temperature scale, press the °C/°F key.  
It is recommended that you read the safety and operation instructions before  
using the thermometer.  
WARNING  
To avoid electrical shock, do not use this instrument when working voltages  
at the measurement surface over 24V AC or DC.  
3. “  
” Display Back-Light  
WARNING  
To avoid damage or burns, do not take temperature measurements in micro-  
wave ovens.  
Press the “ ” key to turn on or turn off the back light.  
4. T1 T2/T1-T2 Main display Input Selection  
The input selection button determines which input is shown on the  
display; T1 ,T2 or the difference between the two probes (T1-T2). When  
thermometer is turned on, it is set to T1.  
ENVIRONMENTAL  
Ambient Operating Ranges:  
0°C to 50°C (32°F to 122°F) <70% R.H.  
Storage Temperature:  
®
HH804U  
5. TYPE(Pt385/Pt3926/Pt3916) Input RTD Probe Select (Main display)  
The TYPE button selects the RTD curve to use for the input currently  
shown. When the thermometer is turned on, it is set to the curve that  
selected when the thermometer was last turned off.  
-20°C to 60°C (-4°F to 140°F) <80% R.H.  
GENERAL  
6. MIN MAX with Time record Mode (only Main display)  
Display:  
Press MIN MAX key to enter the MIN MAX Recording mode, (displays  
Maximum reading with time, Minimum reading with time and Average  
reading stored in recording mode). In the this mode the automatic power-off  
4_ digit liquid crystal display (LCD) with maximum reading of 19999  
Overload: “----.-“ or “OL” is display.  
Battery:  
1.5V x 4 PCS (SIZE AAA) R03P.  
Battery Life:  
200 hours typical with carbon zinc battery  
Auto power off: 30 minutes  
Dimensions:  
160mm(H) x83mm(W) x 38mm(D)  
Weight: Approx. 255g including batteries.  
feature is disabled and  
key, °C/°F key, REL key, SET key, Hi/Lo Li  
key and main display T1 T2 T1- T2 key, TYPE key are disabled.  
beeper emits a tone when a new minimum or maximum value is recorded.  
Push MIN MAX key to cycle through the MAX, MIN and AVG readings.  
If an overload is recorded, the averaging function is Stopped. In the  
mode, press HOLD key to stop the recording of readings, all values are  
zen, press again to restart recording. To prevent accidental loss of  
MAX and AVG data, in this mode can only be cancelled by pressing  
hold down the MIN MAX key for 2 seconds to exit and erased recorded  
readings.  
SPECIFICATIONS  
7. REL Relative mode (only Main display)  
ELECTRICAL  
Press REL key to enter the Relative mode, zero the display, and store  
displayed Reading as a reference value and annunciator REL is displayed.  
Press REL key again to exit the relative mode. The relative value can  
be entered by the user. (See “SET mode”later in this manual.) When the  
sired Relative value has been entered, press REL key to enter the Relative  
mode, press SET key use set Relative value as a reference value. Press  
key again to exit the relative mode. In the Relative mode, the value (can  
> 1999.9 counts) shown on the LCD is always the difference between  
stored reference and the present reading.  
Temperature Scale: Celsius or Fahrenheit user-selectable  
Measurement Range:  
Pt385(100_) -200°C to 800°C, (-328°F to 1472°F)  
Pt3916/Pt3926(100_) -200°C to 630°C, (-328°F to 1166°F)  
Resolution: 0.1°C or 0.2°F  
Accuracy:  
Accuracy is specified for operating temperatures over the range of 18°C to  
28°C (64°F to 82°F), for 1 year, not including RTD probe error.  
(0.05% rdg + 0.2°C) on °C scale  
8. HOLD Mode (only Main display)  
(0.05% rdg + 0.4°F) on °F scale  
Temperature Coefficient:  
0.1 times the applicable accuracy specification per °C from 0°C to 18°C and  
28°C to 50°C (32°F to 64°F and 82°F to 122°F).  
Input Protection:  
Press the HOLD key to enter the Data Hold mode, the “HOLD” annunciator  
is displayed. When HOLD mode is selected, the thermometer held the  
sent readings and stops all further measurements. Press the HOLD  
again to cancel HOLD mode causing thermometer to resume taking  
ureents. In the MIN/MAX recording mode, press HOLD key to stop the  
cording. Press HOLD key again to resume recording. (Previously recorded  
read are not erased).  
MADE IN TAIWAN  
24V dc or 24V ac rms maximum input voltage on any combination of input  
pins.  
9. SET mode (Relative value set, Time set and Hi/Lo Limits value set)  
Press SET key to enter Relative values SET mode (Press ENTER key  
escape relative values set mode), REL set mode. = = = =.= is displayed  
main display. Relative value is entered via overlay numbers, then  
Maximum Differential Common Mode Voltage (Maximum Voltage be-  
tween T1 and T2 during measurement): 1volt.  
Reading Rate: 1sample/second.  
Input Connector:  
Accepts 4 pin mini-DIN connectors.  
 

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