Omega Switch PSW 850 User Manual

IMPSW850  
Users Guide  
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PSW-850 SERIES  
Pressure Switches  
 
Pressure Controls  
Part Numbers:  
PSW-852, 853, 855,  
856 Series  
Please read all instructional literature carefully and thoroughly before starting.  
WIRING  
GENERAL  
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING.  
Pressure variations are sensed by a bellows, diaphragm or piston  
sensor which either actuates or de-actuates one, two or three snap-  
acting switches at a pre-determined set point(s). Set point(s) is  
adjusted by turning an internal knob and pointer or internal screw  
ELECTRICAL RATINGS STATED IN LITERATURE AND ON  
NAMEPLATE SHOULD NEVER BE EXCEEDED. OVER-LOAD  
ON A SWITCH CAN CAUSE FAILURE ON THE FIRST  
CYCLE.  
WIRE UNITS ACCORDING TO LOCAL AND NATIONAL  
ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE  
SIZE IS 14 AWG.  
Part I - Installation  
Tools Needed  
Screwdriver  
Hammer  
Adjustable wrench  
Connect conduit to the case and wire directly to the switch terminals  
according to local and national electrical codes. Bring the wires up to  
terminals from the rear of the case. (See fig. 1.) If manual reset switch  
or DPDT options are used, lead wires are supplied, color coded as  
follows:  
MOUNTING  
Switch 1  
Switch 2  
INSTALL UNIT WHERE SHOCK, VIBRATION AND  
TEMPERATURE FLUCTUATIONS ARE MINIMAL.  
ORIENT UNIT SO THAT MOISTURE IS  
PREVENTED FROM ENTERING THE ENCLOSURE. IF UNIT  
IS BEING INSTALLED WHERE HEAVY CONDENSATION IS  
Common  
Violet  
Blue  
Yellow  
Orange  
Red  
Normally Open  
Normally Closed  
Black  
ALLOW ENOUGH SLACK SO AS NOT TO AFFECT SWITCH  
MOVEMENT WHEN MAKING SETTING ADJUSTMENTS AND  
ENSURE THAT THE WIRES ARE NOT TOUCHING THE  
COVER WHEN INSTALLED.  
EXPECTED,  
VERTICAL  
MOUNTING  
(PRESSURE CONNECTION DOWN) IS REQUIRED. DO NOT  
MOUNT UNIT IN AMBIENT TEMPERATURES EXCEEDING  
PUBLISHED LIMITS.  
NOTE: For larger wire gauges, a one time shift may be  
experienced or expected due to space limitations within the enclo-  
sure. Verify setpoint after installation.  
PSW-850 Series pressure controls can be mounted in any  
position, provided the electrical conduit is not facing up. The  
preferred mounting position is vertical (pressure connection  
down).  
NOTE: The middle switch assembly is omitted for dual switch con-  
trollers. The outer switch assemblies are omitted for single switch  
controllers. Type PSW-852, 853 controls have internal screw adjust-  
ments and type PSW-855, 856 have cam assemblies for internal cali-  
brated adjustments.  
The cast-in knockouts for 3/4” electrical conduit are located on the  
side and rear of the enclosure. These can easily be knocked out by  
placing the blade of a screwdriver in the groove and rapping  
sharply with a hammer.  
Mount the unit via the (2) 1/4” screw clearance holes on the enclo-  
sure. See Dimensions. Units may also be mounted via the NPT  
pressure connection.  
ALWAYS HOLD A WRENCH ON THE PRESSURE HOUS-  
ING HEX WHEN MOUNTING UNIT. DO NOT TIGHTEN BY  
TURNING ENCLOSURE. THIS WILL DAMAGE SENSOR  
AND WEAKEN SOLDER OR WELDED JOINTS.  
Figure 1  
 
Special Instructions For Vacuum Ranges  
PSW-855, 856  
On vacuum ranges, the C-NO circuit is closed at sea level  
conditions. Therefore, increasing vacuum will cause the C-  
NC circuit to close while decreasing vacuum will cause the  
C-NO circuit to close. Please make a note of this and  
wire/adjust the unit accordingly.  
Controls are factory calibrated for maximum accuracy at the  
dial midpoint. Switches may be set together or apart up to  
100% of the range scale. On dual switch models either  
switch may be set high. On triple switch models, the third  
(middle) switch has no over-travel mechanism and must  
always be set to the highest pressure when the switches are  
set apart. Altering the setting of one switch will usually have  
little effect on the other(s), however re-calibration may be  
desired at a critical setting or after changing switch(es) or sen-  
sor.  
Part II - Adjustments  
Tools Needed  
Screwdriver  
To re-calibrate, turn pointer to desired set point and add  
gauge pressure until switch transfers. If gauge pressure and  
set point pressure do not agree, turn zero adjust screw  
clockwise to raise. Counter-clockwise to lower setting.  
NOTE: For set point adjustments and re-calibration, con-  
nect control to a calibrated pressure gauge.  
PSW-852, PSW-853  
Remove cover, follow same procedure as paragraph above.  
Switches may be set together or apart, up to 100% of range  
scales (maximum separation on models PSW-852A* is  
defined in Table 1). On dual switch, either switch may be set  
high. On triple switch models, the third (middle) switch has  
no over-travel mechanism and must always be set to the  
highest pressure when switches are set apart. Altering the  
setting of one switch will usually have little effect on the  
other(s), however re-calibration may be desired at a critical  
pressure setting and after changing switch(es) or sensor.  
Part III - Replacements  
Tools Needed  
Screwdriver  
USE ONLY FACTORY AUTHORIZED REPLACEMENT PARTS  
AND PROCEDURES. DISCONNECT ALL LIVE CIRCUITS  
BEFORE PROCEEDING. COMPONENTS AVAILABLE FOR  
REPLACEMENT ARE THE SWITCHES. OTHER COMPONENTS  
FACTORY REPLACEABLE ONLY.  
Table 1  
REPLACEMENT OF SWITCH(ES)  
Model & Range  
Switch Separation  
(% of Range Span)  
1) Disconnect leadwires.  
PSW-852AA (-300 to 0 ”wc VAC)  
PSW-852AB (-10 to +10 ”wc)  
PSW-852AC (-50 to +50 ”wc)  
PSW-852AD (0.5 to 5 ”wc)  
PSW-852AE (2.5 to 50” wc)  
PSW-852AF (10 to 250 ”wc)  
25%  
35%  
35%  
50%  
50%  
20%  
2) Remove the two mounting screws. On multi-switch  
controls, first remove switch bias springs (See Figure 1.)  
3) Insert replacement switch and replace screws and bias  
springs.  
4) Check switch set point and re-calibrate per PART II if  
necessary.  
Special Instructions for Models PSW-852A*  
When calibrating the Models PSW-852A*, Switch 2 (the  
right switch as viewed from the front of the control) must be  
set to the lower pressure value. Use a screwdriver to turn the  
adjustment screw and obtain the desired actuation pressure  
for Switch 2. Switch 1 can then be set following the proce-  
dure outlined above for other products. Maximum separa-  
tion between Switch 1 and 2 is defined in Table 1.  
 
Dimensions  
Dimension A  
Models  
Inches  
mm  
NPT  
Pressure  
PSW-852CH, 852CG, 852CJ, 852CL, 855CM &  
PSW-856CH, 856CJ, 856CL, 856CM &  
PSW-853CH, 853CJ, 853CL, 853CM  
PSW-852AA, 852AB, 852AC, 852AD, 852AE, 852AF  
PSW-852BI, 852BK, 852BL  
5.81  
8.25  
4.56  
5.5  
146.84  
209.6  
115.8  
139.70  
163.58  
1/4  
1/2  
1/4  
1/4  
1/4  
PSW-852DN, 855DN, 856DN  
PSW-852EO, 852EP  
6.44  
Pressure  
6
(152.4 mm)  
PSW-852DN, 855DN, 853D, 856DN  
PSW-852CH, 852CG, 852CJ, 852CL, 855CM  
PSW-856CH, 856CJ, 856CL, 856CM  
PSW-853CH, 853CJ, 853CL, 853CM  
PSW-852AA, 852AB, 852AC,  
852AD, 852AE, 852AF  
PSW-852BI, 852BK, 852BL  
PSW-852EO, 852EP  
 
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a  
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month  
grace period to the normal one (1) year product warranty to cover handling and shipping time. This  
ensures that OMEGA’s customers receive maximum coverage on each product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service  
Department will issue an Authorized Return (AR) number immediately upon phone or written request.  
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no  
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,  
including but not limited to mishandling, improper interfacing, operation outside of design limits,  
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of  
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;  
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating  
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not  
limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However,  
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any  
damages that result from the use of its products in accordance with information provided by  
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be  
as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR  
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,  
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND  
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF  
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA with respect to this order, whether based on contract, warranty, negligence,  
indemnification, strict liability or otherwise, shall not exceed the purchase price of the  
component upon which liability is based. In no event shall OMEGA be liable for  
consequential, incidental or special damages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical  
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or  
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility  
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify  
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the  
Product(s) in such a manner.  
RETURN REQUESTS/INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN  
(AR) NUMBER FROM OMEGAS CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID  
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return  
package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent  
breakage in transit.  
FOR WARRANTY RETURNS, please have the  
following information available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
information available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
1. Purchase Order number to cover the COST  
of the repair,  
2. Model and serial number of the product under  
warranty, and  
3. Repair instructions and/or specific problems  
relative to the product.  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific problems  
relative to the product.  
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords  
our customers the latest in technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 2000 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,  
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the  
prior written consent of OMEGA ENGINEERING, INC.  
 
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
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M-3568/0500  
 

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