Omega Products PSW300 Installation Manual

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TM

®

User’s Guide

PSW300 Series

Pressure Switches

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: Tel: [phone] FAX: [phone]

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

[e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LAAmstelveen, The Netherlands

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

Czech Republic: Rudé armády 1868, 733 01 Karviná

TEL: [phone] FAX: [phone]
Toll Free in Czech Rep.: 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 TC-OMEGA

SM

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 the United Kingdom: 0800 488 488
e-mail: [e-mail]

omega.com

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.

TM

®

INSTALLATION AND ADJUSTMENT INSTRUCTIONS

OMEGA

®

PSW300 SNAP-ACTION

SWITCHES FOR PRESSURE CONTROL

STANDARD RANGES

10, 30, 60, 100, 150 in.H2O

STANDARD RANGES

15,30, 60, 100, 200, 400.600 PSI

*1000, 2000, 3000 PSI

OPERATION

The OMEGA®pressure control is a precision
device which features a snap-action switch.
Fixed deadband is available with single or dual
SPDT independently adjustable switches with
various electrical ratings. Adjustable deadband
is available with SPDT switch with various
electrical ratings. Several wetted material con­structions for compatibility with pressure
media may be obtained.

PSW321 through PSW348 switches may be set
to operate simultaneously or up to 85 percent
of the range apart. The deadband of each
switch will be within the limits noted on the
nameplate. PSW301 through PSW311 switches
may be set to operate with any deadband with­in the limits shown on the nameplate.

MOUNTING

The PSW300 Series OMEGA®snap-action pres­sure switch has a NEMA-4X enclosure which is
an epoxy coated aluminum casting.

Two holes in the integral bracket are used to
surface mount the control. Location of these
holes is shown on the general dimension draw­ings. Mount on a vibration free surface or pipe
in any orientation. When tightening control to
pressure line, always use the wrench flats or

hex on the pressure connection.

NEVER

TIGHTEN BY TWISTING THE CASE.

ELECTRICAL CONNECTION

Remove cover, held in place by two screws.

Wire directly to the switch according to circuit
requirements. Terminals are marked common
(C), normally open (NO) and normally closed
(NC).

CONDUIT CONNECTIONS

One 3⁄

4 NPT hole fitted with a shipping plug,

and two additional knock outs are provided.
The knockouts may be removed by placing a
screwdriver in the slot and rapping sharply
with a hammer. It is recommended that Teflon
tape or other sealent be used on conduit bush­inqs or plug threads to ensure integrity of the
enclosure.

SETPOINT ADJUSTMENTS

Setpoints are changed by means of the setpoint
adjusters. The PSW300 Series adjustable dead­band and PSW320, 330, and 340 Series dual
switches each have two adjusters. On switches
with two adjusters, the one on the left is
referred to as “A” and the right one is referred
to as “B”; see illustration. Setpoints can be
adjusted from 20 to 100 percent of full range on
increasing pressure.

PSW321 THROUGH PSW348
DUAL SWITCH

Remove cover. For setpoint adjustment on
either increasing or decreasing pressure to

within ±1/0 of nominal range, mount the
switch on a calibration stand and use a suitable
reference such as an OMEGA

®

gauge or test

gauge. Monitor switch with a light or meter.

Pressurize the system to the required higher
setpoint pressure and turn adjuster “B” until
the switch operates or resets as required. When
the setpoint has been achieved, raise and lower
the pressure to ensure that the setpoint is cor­rect. Then reduce system pressure to the
required lower setpoint pressure and turn
adjuster “A” until the switch operates or resets
as required. Verify this setpoint by raising and
lowering pressure. Now increase system pres­sure to higher setpoint and make final adjust­ment on “B.”

PSW301 THROUGH PSW311
ADJUSTABLE DEADBAND SWITCH

Remove cover. Adjuster “B” controls the oper­ating point of the switch on increasing pres­sure. Adjuster “A” controls the reset point of
the switch on decreasing pressure.

For accurate setpoint adjustment, mount the
switch on a calibration stand and use a suitable
reference such as an OMEGA

®

gauge or test
gauge. Monitor switch with a light or meter.
Pressurize the system to the required setpoint
pressure. Turn adjuster “B” until switch oper­ates. Then lower pressure to the reset point,
turn adjuster “A” until the switch resets. Now

increase pressure to the operating point and
make final adjustment on “B.” Raise and lower
pressure to ensure that the setpoint and reset
point are correct.

SOME PRECAUTIONS TO OBSERVE

Do not loosen the screws holding the precision
switch element(s) or mounting bracket in place.

Nameplate

PROOF pressure should not be
exceeded. Intermittent operation up to proof
pressure is permissible, however, some change
of setpoint may be noted. Operation and correct
setpoint actuation should be routinely tested.

A B

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

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 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.

MADE IN

DPS-5C-1P-10/99 M0533/0203

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