Omega Products PSW-12 Installation Manual

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User’s Guide

PSW-12 SERIES

Pressure Switches

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IMPSW12

GENERAL

The PSW 12 switch utilizes a diaphragm sensor to detect a pres­sure change. The response, at a predetermined set point, actuates
a SPDT snap-acting switch, converting a pressure signal into an
electrical signal. Control set point may be varied by turning the
internal slotted adjustment screw according to procedures outlined
in this document.

Tools Needed

1 1/16” Open end wrench

MOUNTING

ALWAYS LOCATE UNITS WHERE SHOCK, VIBRATION AND
AMBIENT TEMPERATURE FLUCTUATIONS ARE MINIMAL.

DO NOT MOUNT IN AMBIENT TEMPERATURE AREAS
EXCEEDING 203° F (IF UL/cUL APPROVAL IS APPLICABLE) OR
176°F (IF CENELEC APPROVAL IS APPLICABLE). IF SEVERE
PRESSURE SURGES ARE EXPECTED, USE SNUBBER .

MOUNT USING PRESSURE CONNECTION: ALWAYS USE
A WRENCH ON PRESSURE CONNECTION WRENCH FLAT.

UNIT MAY BE MOUNTED IN ANY POSITION. HOWEVER,
IF INSTALLATION LOCATION RESULTS IN FREQUENT

EXPOSURE TO LIQUID IT IS RECOMMENDED THAT THE
UNIT BE MOUNTED VERTICALLY WITH THE PRESSURE CONNEC­TION DOWN. IF UNIT IS TO BE SET AFTER MOUNTING, VERIFY
THAT ADJUSTMENT OPENING IS ACCESSIBLE. “FRONT” MARK­ING ON NAMEPLATE MUST FACE THE OPERATOR.

Please read all instructional literature carefully and thoroughly before starting.

Explosion Proof
Pressure Switch

Part Number
PSW-12 Series

Part I - Installation

1/2” NPTM

When panel mounting, mount through 7/8” clearance hole in panel.
Hold in place with serrated 1/2” conduit nut. Always support the unit by
holding a wrench on the hex.

TO ATTACH CONDUIT CONNECTION, HOLD ELECTRICAL
CONNECTION STEADY WITH WRENCH ON HEX, THEN
THREAD ON CONDUIT.

Surface Mounting Bracket

Open the adjustment cover and orient the unit so that adjustment open­ing will be accessible when the switch is mounted. Close the adjust­ment cover ensuring that the bracket does not interfere with the cover.
Failure to do so may result in improper sealing of adjustment cover.
Mount assembly in desired location.

WIRING

DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING
UNIT. ELECTRICAL RATINGS STATED IN LITERATURE AND
ON NAMEPLATE MUST NOT BE EXCEEDED. OVERLOAD ON

A SWITCH CAN CAUSE FAILURE ON THE FIRST CYCLE.

WIRE IN ACCORDANCE WITH LOCAL AND NATIONAL ELEC­TRICAL CODES.

1/2 NPTM conduit connection is provided on top of the unit with
18” leadwires. Unit is available with SPDT or DPDT operation.
External grounding screw and clamp is provided with option GND.

Leadwires are color coded:

TERMINALS SPDT DPDT

SWT1 SWT2

Common Brown Brown Yellow
Normally Closed Red Red Black
Normally Open Blue Blue Violet
Ground Green Green

UL listed,cUL certified
Industrial Control Equipment
For use in Hazardous Locations
Class I, Division 1 & 2, Groups A, B, C, D
Class II, Divisions 1 & 2, Groups E, F, G Class III
Ambient Temp. Range= -50°C (-58°F) to 95°C (203°F)
UL, cUL File #E40857

NOTE: External grounding screw (- GND) is

required for non-metallic conduit systems.

Part II - Adjustments

Dimensions

Tools Needed

Flathead screwdriver with 3 16” or 1/4” wide blade

1. Connect control to pressure source.

2. With power disconnected, slide cover toward
electrical terminations while twisting it to over-come friction.

3. Connect power to terminals or leads.

4. Insert screwdriver into adjustment slot and turn
left (clockwise) to increase setting or right
(counterclock-wise) to decrease setting.

For setting on RISE, apply desired pressure and turn adjustment left
(clockwise) until switch clicks (circuit across N.O. and COM terminals
closes). For setting on FALL, apply pressure equal to normal system
operating pressure. Reduce source pressure to setpoint value. Turn
adjustment right (counter clockwise) until switch clicks (circuit across
N.C. and COM closes).

1/4

Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

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: [phone]-7803 e-mail: [e-mail]

FAX: [phone] [e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Rudé armády 1868, 733 01 Karviná 8

TEL: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [e-mail]

France: 9, rue Denis Papin, 78190 Trappes

TEL: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 639 7678
e-mail: [e-mail]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5EX United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800-488-488
e-mail: [e-mail]

OMEGAnet®On-Line Service Internet e-mail

www.omega.com [e-mail]

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, patient-connected 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.

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.

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 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.

M-3570/0500

Where Do I Find Everything I Need for

Process Measurement and Control?

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