Omega Psw20 Users Manual M4067 0504

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PSW20 Series
Pressure, vacuum or differential pressure switches
INSTRUCTION
SHEET

M4067-0504
Shop online at: omega.com e-mail: info@omega.com
For latest product manuals: omegamanual.info

Installation Instructions for OMEGA PSW20 Series: Pressure, Vacuum and Differential
Pressure Switches.
General
The PSW20 series is single pole switch that can be used as a pressure or vacuum switch (from 0.40 in W. C. to
20 inches W. C.) or as a pressure differential switch. The switch can respond to rapid pulsing and the gold
plated silver contacts will handle low level switching currents.
Mounting Instructions
Switch may be mounted in horizontal or vertical position, through 0.12" (3mm) holes on 1.34" (34mm)
centerline, with suitable clearances to accommodate 0.15" I.D tubing and electrical connectors – see diagram
for dimensions.

Electrical, Pneumatic and Material/Mechanical Specification
Part
Number
PSW20A
PSW20B

Pressure range
(inches water, gauge)
Pressure Vacuum Differential
0.4-15
0.4-15
.04-15
1-20
1-20
1-20

Part
Number
PSW20A
PSW20B

Standard
Electrical rating
Max.
Min
Resistive Resistive
750ma
5 ma
250VAC 3 VDC
1 amp
5 ma
250
3 VDC
VAC

Body
Diaphragm

Contacts
Springs
Terminals
Adjusting screw
Weight
Operating temperature
Listings

Repeat
Accuracy
Contact
Resistance
Constant
Temperature (ohms)
+/- 4%
0.04
+/- 3%

0.02

Acetal
EPDM is standard; Nitrile
available. NOTE: EPDM should
not be used in petroleum
applications
Gold plated silver
Plated phosphor bronze
Plated copper or brass
Stainless steel or zinc plated SS
9 grams (0.3oz)
-30 C to +65 C (-23F to 149F)
UL recognized for 100,000
operations
CSA certified

Connections and Adjustment
Pressure Switching – Normally Open Contacts
Connect the pressure source to inlet port B (see diagram) and set the adjusting screw to the desired pressure.
Turning the screw clockwise narrows the gap between contacts and decreases the pressure set point. Turning the
pressure adjusting screw counterclockwise increases the set point. Note: the media entering the
diaphragm through Port B is separated from the electrical contacts by the diaphragm.
Pressure Switching – Normally Closed Contacts
Connect the pressure source to Port A and monitor continuity across the terminals. Slowly turn the adjusting
screw clockwise, narrowing the gap between contacts until the contacts are closed. Apply the set point pressure
which will open the contacts. Continue to turn the adjusting screw clockwise until the contacts
make and break at the desired point.
Vacuum Switching
Repeat the above procedure using Port A for Normally Open Contacts and Port B for Normally Closed
Contacts.

Media in Contact with Electrical Contacts
Note that the pressure media entering through Port A is in direct contact with the electrical contacts in the
switch, whereas the pressure media entering through Port B is separated from the electrical contacts by the
diaphragm.
Note: The EPDM diaphragm should not be used with petroleum products. Specify Nitrile for these applications.

Servicing Europe:
®

OMEGAnet Online Service
www.omega.com

Internet e-mail
info@omega.com

Servicing North America:
USA:
ISO 9001 Certified

Canada:

One Omega Drive, Box 4047
Stamford CT 06907-0047
Tel: (203) 359-1660
e-mail: info@omega.com

FAX: (203) 359-7700

976 Bergar
Laval (Quebec) H7L 5A1, Canada
Tel: (514) 856-6928
FAX: (514) 856-6886
e-mail: info@omega.ca

Benelux:

Postbus 8034, 1180 LA Amstelveen, The Netherlands
Tel: +31 (0)20 3472121
FAX: +31 (0)20 6434643
Toll Free in Benelux: 0800 0993344
e-mail: sales@omegaeng.nl

Czech Republic:

Frystatska 184, 733 01 Karviná, Czech Republic
Tel: +420 (0)59 6311899
FAX: +420 (0)59 6311114
Toll Free: 0800-1-66342
e-mail: info@omegashop.cz

France:

11, rue Jacques Cartier, 78280 Guyancourt, France
Tel: +33 (0)1 61 37 2900
FAX: +33 (0)1 30 57 5427
Toll Free in France: 0800 466 342
e-mail: sales@omega.fr

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Tel: +49 (0)7056 9398-0
FAX: +49 (0)7056 9398-29
Toll Free in Germany: 0800 639 7678
e-mail: info@omega.de

For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA®
Customer Service: 1-800-622-2378 / 1-800-622-BEST®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN®
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico:

En Espan˜ol: (001) 203-359-7803
FAX: (001) 203-359-7807

United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified

e-mail:espanol@omega.com
info@omega.com.mx

Northbank, Irlam, Manchester
M44 5BD United Kingdom
Tel: +44 (0)161 777 6611
FAX: +44 (0)161 777 6622
Toll Free in United Kingdom: 0800-488-488
e-mail: sales@omega.co.uk

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the
European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without
notice. WARNING: These products are not designed for use in, and should not be used for, human applications.

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 OMEGA’S 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.
PATENT NOTICE: U. S. Pat. No. 6,074,089; 5,465,838 / Canada 2,228,333; 2,116,055 / UK GB 2,321,712 / Holland 1008153 / Israel 123052 / France
2 762 908 / EPO 0614194. Other patents pending.
FOR WARRANTY RETURNS, please have the following information
available BEFORE contacting OMEGA:
1. Purchase Order number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems relative to the product.

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges.
Have the following information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST of the repair,
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 2004 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.

M4067/0504



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