Omega Products PSW21A Installation Manual

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PSW21 and PSW22 Series

Compact, rugged, adjustable pressure & vacuum switches

INSTRUCTION

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M4068-0504

Installation instructions for OMEGA PSW21 & PSW22 Series: Compact, rugged,

adjustable Pressure & Vacuum Switches

General

The PSW21 & PSW22 series are compact pressure and vacuum switches that are designed and manufactured to
exacting standards to meet the needs of OEM manufacturers and instrument makers for a low cost, stable,
repeatable switch. Plastic mechanisms and housings are Acetal to minimize moisture absorption and maintain
dimensional stability. Plastic welding is accomplished using advanced microprocessor controlled ultrasonic
welding equipment. All switches are 100% tested at high and low settings, and at the proof pressure. Units are
delivered with the setpoint at approximately the midpoint of the adjustable range.

.

Mounting Instructions

PSW21 switches are mounted with a 9/16-18UNF mounting thread, with nut included and a 1/8" NPT male
connector.

PSW21 Series

1/8 NPT

Electrical/Pneumatic Specifications for Pressure Series

Model No. Adjustable Range Proof Pressure SPDT Switch Rating

PSW21A 3 to 7" H20 20 psig 3 amps (resistive)

PSW21B 5 to 35" H2O 20 psig 5 amps (resistive)

PSW21C 1 to 6 psig 50 psig 21 amps (resistive)

PSW21D 4 to 11 psig 50 psig 25 amps (resistive)

PSW21E 9 to 18 psig 50 psig 25 amps (resistive)

PSW21F 15 to 28 psig 50 psig 25 amps (resistive)

PSW21G 25 to 40 psig 200 psig 25 amps (resistive)

PSW21H 35 to 65 psig 200 psig 25 amps (resistive)

PSW21J 50 to 100 psig 200 psig 25 amps (resistive)

PSW21K 75 to 120 psig 200 psig 25 amps (resistive)

Model No. Adjustable Range Proof Pressure

PSW21BD 10 to 35" H2O 250" H2O 5 amps (resistive)

PSW21CD 1 to 6 psig 50 psig 21 amps (resistive)

PSW21DD 4 to 11 psig 50 psig 25 amps (resistive)

PSW21ED 9 to 18 psig 50 psig 25 amps (resistive)

PSW21FD 15 to 28 psig 50 psig 25 amps (resistive)

PSW21GD 25 to 40 psig 200 psig 25 amps (resistive)

PSW21HD 35 to 65 psig 200 psig 25 amps (resistive)

PSW21JD 50 to 100 psig 200 psig 25 amps (resistive)

PSW21KD 75 to 120 psig 200 psig 25 amps (resistive)

Electrical/Pneumatic Specifications for Vacuum Series

Model No. Adjustable Range Proof Pressure SPDT Switch Rating

PSW21L 3 to 7" WC Vac 350" WC Vac 3 amps (resistive)

PSW21M 6 to 16" WC Vac 350" WC Vac 10 amps (resistive)

PSW21N 13 to 25" WC Vac 350" WC Vac 21 amps (resistive)

PSW21P 20 to 40" WC Vac 350" WC Vac 21 amps (resistive)

PSW21Q 35 to 80" WC Vac 350" WC Vac 21 amps (resistive)

PSW21R 75 to 150" WC Vac 350" WC Vac 21 amps (resistive)

PSW21T 145 to 300" WC Vac 350" WC Vac 21 amps (resistive)

Model No. Adjustable Range Proof Pressure DPDT Switch Rating

PSW21MD 6 to 16" WC Vac 350" WC Vac 10 amps (resistive)

PSW21ND 13 to 25" WC Vac 350" WC Vac 21 amps (resistive)

PSW21PD 20 to 40" WC Vac 350" WC Vac 21 amps (resistive)

PSW21QD 35 to 80" WC Vac 350" WC Vac 21 amps (resistive)

PSW21RD 75 to 150" WC Vac 350" WC Vac 21 amps (resistive)

PSW21TD 145 to 300" WC Vac 350" WC Vac 21 amps (resistive)

Mounting Instructions

PSW22 switches are mounted with a 9/16-18UNF mounting thread, nut included, with a center spout for 1/8"
I.D. tubing.

PSW22 Series

Electrical/Pneumatic Specifications for Pressure Series

Model No. Adjustable Range Proof Pressure SPDT Switch Rating

PSW22A 3 to 7" H2O 250" H2O 3 amps (resistive)

PSW22B 5 to 35" H2O 250" H2O 5 amps (resistive)

PSW22C 1 to 6 psig 50 psig 21 amps (resistive)

PSW22D 4 to 11 psig 50 psig 25 amps (resistive)

PSW22E 9 to 18 psig 50 psig 25 amps (resistive)

PSW22F 15 to 28 psig 50 psig 25 amps (resistive)

Model No. Adjustable Range Proof Pressure DPDT Switch Rating

PSW22BD 10 to 35" H2O 250" H2O 5 amps (resistive)

PSW22CD 1 to 6 psig 50 psig 21 amps (resistive)

PSW22DD 4 to 11 psig 50 psig 25 amps (resistive)

PSW22ED 9 to 18 psig 50 psig 25 amps (resistive)

PSW22FD 15 to 28 psig 50 psig 25 amps (resistive)

Additional Information

Temperature Range: -10 to 70ºC (14 to 158ºF)

Set point Accuracy: +/- 10% of setting at 70ºF. Note: pressure setting may change over the temperature range.

Hysteresis (Dead Band): 15 to 25% of the set point.

Terminals: 6.35mm (0.25") standard “slide-on” male.

Materials of Construction (all series)

Body and Mechanism Acetal

Diaphragm EPDM (Ethylene-Propylene Diene Monomer)

Screws Stainless or zinc plated steel

Springs Stainless Steel

Media Compatibility

Weight 50 g (1.8 oz)

Overall Dimensions Approx. 43.2 x 68.6 x 51.0 mm (1.7 x 2.7 x 2.0")

Setting

Dual Pressure Switch

Listings UL Recognized & CSA Certified

Air, water and many other fluids and gases that are compatible

with EPDM and Acetal. Note: Mineral Oil and other similar

fluids are not compatible with EPDM. Request Nitrile

diaphragm( see Custom Switches).

The pressure switch is field adjustable using the hex head set

screw at the center of the pressure switch (PSW21/22-

WRENCH). The Vacuum Switch is field adjustable using the

Philips head screw on the switch carrier.

The DPDT (two switches) will both change state at

approximately the same set point. On DPDT units, one switch

may be set to lead or lag the other (see Custom Switches).

Servicing Europe:

OMEGAnet®Online Service Internet e-mail

Benelux:

www.omega.com [e-mail]

USA:

ISO 9001 Certified

Canada:

Servicing North America:

One Omega Drive, Box 4047
Stamford CT 06907-0047
Te l: [phone] FAX: [phone]
e-mail: [e-mail]

976 Bergar
Laval (Quebec) H7L 5A1, Canada
Te l: [phone] FAX: [phone]
e-mail: [e-mail]

Czech Republic:

France:

Germany/Austria:

For immediate technical or application assistance:

USA and Canada:

Mexico:

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.

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

En Espan˜ol: [phone]-7803 e-mail:[e-mail]
FAX: [phone] [e-mail]

®

®

United Kingdom:

®

ISO 9002 Certified

Postbus 8034, 1180 LAAmstelveen, The Netherlands
Te l: [phone] FAX: [phone]
To ll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Frystatska 184, 733 01 Karviná, Czech Republic
Tel: [phone] FAX: [phone]
To ll Free: 0800-1-66342 e-mail: [e-mail]

11, rue Jacques Cartier, 78280 Guyancourt, France
Te l: [phone] FAX: [phone]
To ll Free in France: 0800 466 342
e-mail: [e-mail]

Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Te l: [phone] FAX: [phone]
To ll Free in Germany: 0800 639 7678
e-mail: [e-mail]

One Omega Drive, River Bend Technology Centre
Northbank, Irlam, Manchester
M44 5BD United Kingdom
Tel: [phone] FAX: [phone]
To ll Free in United Kingdom: 0800-488-488
e-mail: [e-mail]

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.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO

RETURN REQUESTS / INQUIRIES

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 W

ARRANTY 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.

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.

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.