Omega Vehicle Security Switch PSW141 series User Manual

Use r s Gu id e  
omega.com  
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www.omega.com  
e-mail: info@omega.com  
PSW-141 Series  
Low Differential Pressure Switch  
 
INSTALLATION OF PSW-141 PRESSURE  
SWITCH  
NOTE:  
Each switch is calibrated in the vertical  
positionꢀ It is recommended the switch be  
mounted in the vertical position, as viewed  
in Figure 1ꢀ Any adjustments to the  
setpoint or deadband should be performed  
with the instrument in the mounted positionꢀ  
The PSW-141 differential pressure switch is suitable for clean air  
or inert gas applicationsꢀ If dust is present, a small in-line filter is  
recommended to insure long, trouble-free operationꢀ The normal  
operating temperature range is from 0°C to 45°C (32°F to 115°F),  
and the normal humidity range from 10% to 90% RꢀHꢀ  
Figure 1  
Air connections are by means of 3/16” (4ꢀ75mm) barbed fittings  
suitable for 1/4” OꢀDꢀ polyethylene tubing (6mm), 1/8” IꢀDꢀ Tygon or  
polyurethane tubing (3 - 4mm)ꢀ  
The two mounting holes are 0ꢀ19” (4ꢀ8mm) in diameter and are  
suitable for #8 or #10 mounting screwsꢀ  
Ohmmeter Output: Relay  
Common and Normally  
Closed  
Rising  
Pressure  
Electrical connections are by means of 3/8” terminal strips with #6  
screwsꢀ  
Spacing between mounting holes: 4ꢀ75 inches (121 mm)ꢀ  
Care should be taken not to exceed the maximum overpressureꢀ  
Falling  
Pressure  
Pressure  
No Applied  
Pressure  
Full Pressure  
Maximum Safe Momentary Overpressure Table  
Closed (0)  
Open (OL)  
Open (OL)  
Closed (0)  
Range  
Overpressure  
English  
Metric  
English  
Metric  
0.1" to 1.0" H2O  
2.0" to 10.0" H2O  
11" H2O to 5 PSID  
6 PSID to 15 PSID  
16 PSID to 30 PSID  
25 to 250 Pa  
0.5 to 2.5 kPa  
2.7 to 35 kPa  
40 to 100 kPa  
110 to 200 kPa  
8" H2O  
5 PSID  
20 PSID  
30 PSID  
60 PSID  
2 kPa  
35 kPa  
140 kPa  
200 kPa  
420 kPa  
Table 2  
Setpoint Adjustment  
Apply full pressure, (or the pressure at which the setpoint is to  
activate)ꢀ Rotate the 20 turn Setpoint potentiometer, until the ohm-  
meter changes stateꢀ Turn clockwise to increase the set point and  
counter-clockwise to decrease the set point  
Power consumption is ꢀ35 W for the DC powered units,  
1ꢀ70 W for the 24 Vac and 1ꢀ90 W for the 120 Vacꢀ  
The power supply leads are connected to the two leftmost termi-  
nals (terminals 1 and 2) on the terminal stripꢀ The relay terminals  
are accessed across terminals 3, 4, and 5, refer to Figure 1ꢀ  
Slowly decrease the pressure until the relay deactivatesꢀ The dif-  
ference between the pressure at which the relay deactivates and  
the pressure at which the relay activates is the deadbandꢀ If more  
deadband is required, turn the deadband potentiometer and re-  
peat the previous stepsꢀ Adjustment of the deadband will have a  
slight effect on the set point, therefore it will be necessary to re-  
peat these steps several timesꢀ  
The pressure switch comes with Setpoint and Deadband Adjust-  
mentsꢀ These are adjusted at the factory to activate on either fall-  
ing or rising pressureꢀ The setpoint is factory set to activate at the  
maximum pressureꢀ The deadband is set to 5% of the maximum  
pressureꢀ  
RELAY SPECIFICATIONS  
The output of the SPDT (1 Form C) relay contact is rated at:  
5A @ 30 VDC/120 VAC Resisitive  
SETPOINT/DEADBAND ADJUSTMENT PROCEDURE  
4A @ 240 VAC Resistive  
The set point and deadband are field adjustable so long as an  
accurate pressure source is available and a qualified technician  
performs the adjustmentsꢀ The low pressure switches are extremely  
sensitive to sudden pressure changesꢀ  
Gold-plated relay contactsꢀ  
Electrical life expectancy: 100 x 103 opsꢀ minimum @ 5A  
Isolation between coil and contacts: 2000 VAC 1 minute  
Maximum switched power: 600 VA (AC) or 120 W (DC)  
Operate Time: 8 ms, max (Excluding Bounce)  
Release Time: 4 ms, max (Excluding Bounce)  
To gain access to the Setpoint or Deadband potentiometers re-  
move the black hole plugs above the Setpoint and Deadband la-  
bels, located on the top left of the instrumentꢀ To access either  
potentiometer use a slotted 3/32” screw driverꢀ  
Connect the switch to its appropriate power supplyꢀ  
Connect an ohmmeter to the relay contacts “common” and “nor-  
mally closed” or “normally open”ꢀ If a switch was ordered with a  
relay activated on “Rising Pressure” and the ohmmeter terminals  
are connected to the “normally closed” and “common” of the relay,  
with no pressure applied, the ohmmeter should read 0 or closed,  
refer to Table 2ꢀ  
Deadband Adjustment  
To set the deadband to zero, turn the Deadband potentiometer  
fully counter-clockwise ꢀ Zero deadband will cause the relay to  
chatterꢀ It is recommended that some amount of deadband be  
usedꢀ Turning the deadband potentiometer clockwise increases  
the deadbandꢀ  
PSW-141 Series  
M-3488 / 0011  
 
WARRANTY/DIS CLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and workm anship for a  
period of 1 3 m o n t h s from date of purchase. OMEGA’s Warranty adds an additional one (1) m onth grace  
period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to cover handling and shipping tim e. This  
ensures that OMEGA’s custom ers receive m axim um coverage on each product.  
If the unit m alfunctions, it m ust be returned to the factory for evaluation. OMEGA’s Custom er Service  
Departm ent will issue an Authorized Return (AR) num ber im m ediately upon phone or written request.  
Upon exam ination 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 lim ited to m ishandling, im proper interfacing, operation outside of design lim its,  
im proper repair, or unauthorized m odification. 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, m oisture or vibration; im proper specification; m isapplication; m isuse or other operating  
conditions outside of OMEGA’s control. Com ponents which wear are not warranted, including but not  
lim ited to contact points, fuses, and triacs.  
OMEGA is p le a s e d t o o f fe r s u g g e s t io n s o n t h e u s e o f it s v a rio u s p r o d u c t s . Ho w e ve r,  
OMEGA neither assum es responsibility for any om issions or errors nor assum es liability for any  
dam ages that result from the use of its products in accordance w ith inform ation provided by  
OMEGA, either verbal or w ritten. OMEGA w arrants only that the parts m anufactured by it w ill be  
a s s p e c if ie d a n d f r e e o f d e f e c t s . O M EG A M A KES N O O THER WA RRA N TIES O R  
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,  
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FIT-  
N ES S FO R A P A RTIC U LA R P U RP O S E A RE HEREBY D IS C LA IM ED . LIM ITATIO N O F  
LIABILITY: The rem edies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,  
in d e m n ific a t io n , s t ric t lia b ilit y o r o t h e rw is e , s h a ll n o t e xc e e d t h e p u rc h a s e p ric e o f t h e  
c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e v e n t s h a ll O M EG A b e lia b le f o r  
consequential, incidental or special dam ages.  
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in m edical  
applications or used on hum ans. Should any Product(s) be used in or with any nuclear installation or  
activity, m edical application, used on hum ans, or m isused in any way, OMEGA assum es no responsibility  
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indem nify  
OMEGA and hold OMEGA harm less from any liability or dam age whatsoever arising out of the use of the  
Product(s) in such a m anner.  
RETURN REQUES TS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Custom er Service Departm ent. BEFORE  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN  
(AR) NUMBER FROM OMEGA’S CUS TOMER S ERVICE DEPARTMENT (IN ORDER TO AVOID  
PROCESSING DELAYS). The assigned AR num ber should then be m arked 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 inform ation available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
inform ation available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
1. Purchase Order num ber to cover the COST  
of the repair,  
2. Model and serial num ber of the product under  
warranty, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
2. Model and serial num ber of the product, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible. This affords  
our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,  
reproduced, translated, or reduced to any electronic m edium or m achine-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 Mea surem ent a nd Control?  
OMEGA…Of Course!  
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PSW-141 Series  
M-3488 / 0011  
 

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