Omega Vehicle Security Switch PSW490B User Manual

Users Guide  
TM  
omega.com  
®
DSW490B and DSW790B  
Pressure Control Switches  
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INSTALLATION AND MAINTENANCE OF THE  
DSW490B AND DSW490B SERIES  
®
OMEGA SNAP ACTION SWITCHES  
FOR DIFFERENTIAL PRESSURE CONTROL  
DSW490 series standard – one 3  
hole right side.  
DSW790 series standard – two 3  
holes with one permanent plug. NEMA 7 & 9  
enclosures require proper conduit seals and  
breathers as per the National Electrical Code.  
4 NPT conduit  
INTRODUCTION  
The OMEGA differential pressure switch is a  
precision built U.L. approved control device  
which features a mechanical snap action switch.  
Controllers are available for operation on vari-  
ous pressure differentials with fixed or variable  
switching differentials. The standard electrical  
switch is SPDT and is available with various  
electrical characteristics.  
4 NPT conduit  
DSW490 SERIES  
SPDT – Wire directly to the switch according to  
circuit requirements.  
Two SPDT switch elements mounted together  
are available. Various wetted material construc-  
tions for compatibility with a wide range of  
pressure media may be obtained.  
2-SPDT – Dual switching elements consist of  
two SPDT switches mounted together in a  
bracket. Switches are calibrated to have simul-  
taneous operation within 1% of range either on  
increasing or decreasing pressure but not in  
both directions. Wire directly to the front and  
rear switch according to circuit requirements.  
Leads are provided on rear switch color coded  
as follows:  
The snap action differential pressure switch is  
furnished in the standard NEMA 4/4X and explo-  
sion proof NEMA 7 and 9 enclosure styles. Both  
enclosures are epoxy coated aluminum castings.  
INSTALLATION  
Common  
Normally Closed  
Normally Open  
– White  
– Red  
– Blue  
These controls are precision instruments and  
should never be left with internal components  
exposed. During installation insure that covers  
are in place and conduit openings are closed  
except when actually working on the control.  
When hermetically sealed switch element(s) are  
supplied, the lead color coding is as follows:  
Common  
Normally Closed  
Normally Open  
– White  
– Red  
– Blue  
MOUNTING DSW490 AND DSW790 SERIES  
There are three holes external to the enclosure  
for surface mounting. Location of these holes is  
shown on the general dimension drawing. They  
may also be mounted directly on pressure line  
using the pressure connections.  
DSW790 SERIES  
SPDT – Wire directly to the switch according to  
circuit requirements.  
ELECTRICAL CONNECTIONS  
Remove cover  
DSW490 Series – two screws hold cover to  
enclosure  
2-SPDT – Wire to front switch terminal block  
(left) and rear switch terminal block (right) as  
marked. Strip insulation 5  
16,˝ insert in proper  
terminal connector and tighten clamping screw  
to secure.  
DSW790 Series – cover unscrews  
CONDUIT CONNECTIONS  
Note – It is recommended that Teflon tape or  
other sealant be used on conduit, bushing or  
plug threads to ensure integrity of the enclosure.  
ADJUSTMENT OF SETPOINT  
®
DSW490 & DSW790 Series – A single setpoint  
adjustment nut (7  
8˝) is located centrally at the  
bottom on the inside of the enclosure.  
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For accurate setpoint calibration, mount the  
switch on a calibration stand, a pump or catalog  
Omega DWT 1305 deadweight gauge tester. A  
suitable reference standard such as a Test Gauge  
is necessary to observe convenient changes in  
pressure.  
Note – As indicated above, adjustment of set-  
point is made by use of 7  
8˝ nut. Precision switch  
element mounting screws and bracket adjusting  
screw are factory sealed and should not be  
tampered with.  
A typical calibration procedure would be  
as follows:  
TERMINAL BLOCK  
FRONT SWITCH  
TERMINAL BLOCK  
REAR SWITCH  
NC  
NO  
C
NC  
NO  
C
Static Working Pressure  
– 300 psi  
Adjustable Differential Range  
– 5-200 psid  
Differential SetPoint  
– 150 psi above static working pressure  
Simultaneously raise the high and low side pres-  
sure to 300 psi. Maintain the low side pressure at  
300 psi. Raise the high side pressure to 450 psi to  
obtain 150 psi differential.  
Turn the adjustment nut until the switch  
changes mode at 150 psi differential. When the  
setpoint has been achieved, raise and lower the  
high side pressure to ensure that the differential  
setpoint is correct.  
After installation of the control replace cover to  
insure electrical safety and to protect internal  
parts from the environment.  
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DIFFERENTIAL PRESSURE SWITCH –  
INCHES OF WATER  
DIFFERENTIAL PRESSURE SWITCH – PSID  
A
D
Ø 0.28  
(3 Holes)  
B
Ø 0.28  
(3 Holes)  
E
C
A
D
H
1/4 NPT  
Female  
3/4 NPT  
F
C
H
3/4 NPT  
G
1/4 NPT  
Low Pressure  
Inlet  
1/4 NPT  
High  
Pressure  
Inlet  
1/4 NPT  
Female  
E
DSW490B  
DSW490B  
B
G
B
E
E
B
F
F
0.28 THRU  
(3 PLACES)  
0.28 THRU  
(3 PLACES)  
H
H
®
D
®
D
A
3/4 NPT  
(2 PLACES)  
A
1/4 NPT  
FEMALE  
C
3/4 NPT  
(2 PLACES)  
C
1/4 NPT  
LOW PRESSURE  
INLET  
1/4 NPT HIGH  
PRESSURE  
INLET  
1/4 NPT  
FEMALE  
I
G
PSW790B  
PSW790B  
DIMENSIONS (Inches) – PSID Ranges  
STYLE  
A
B
C
D
E
F
G
H
DSW490B  
4.0  
7.78  
3.25  
5.20  
3.31  
4.38  
2.75  
3.88  
2.31  
3.58  
1.19  
1.22  
2.31  
2.31  
2.27  
.312  
DSW790B  
DIMENSIONS (Inches) – ˝H2O Differential Ranges  
STYLE  
A
B
C
D
E
F
G
H
I
DSW490B  
5.69  
4.0  
3.25  
3.31  
5.13  
1.43  
2.75  
DSW790B  
6.38  
5.20  
4.38  
3.88  
3.96  
1.22  
.312  
5.13  
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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 PUR-  
POSE 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 1999 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.  
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Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
TEMPERATURE  
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XXX0000XX  
M3420/0599  
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