Omega Products PSW370 Installation Manual

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TM

®

User’s Guide

PSW370 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]

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OMEGAnet®On-Line Service Internet e-mail

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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

®

OPERATION

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

Series PSW370 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.

MOUNTING

The PSW370 Series OMEGA®snap-action pres­sure switch has a NEMA-4X enclosure which is
made of 316 stainless steel.

Two holes in the intgral bracket supplied 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.

CONDUIT CONNECTIONS

One 3⁄

4 NPSM conduit adapter of 316 stainless

steel is provided. It is recommended that Teflon

INSTALLATION AND ADJUSTMENT INSTRUCTIONS

OMEGA

®

PSW370 SNAP-ACTION

SWITCHES FOR PRESSURE CONTROL

STANDARD RANGES

30, 60, 100, 150 in.H2O
15˝H2O VAC.-15˝H2O

STANDARD RANGES

15, 20, 30, 60, 100, 200, 400, 600 PSI

*1000, 2000, 3000 PSI

30˝Hg VAC-OPSI

tape or other sealant be used on conduit bush­ings or plug threads to ensure integrity of the
enclosure.

ELECTRICAL CONNECTION

Remove cover, held in place by four screws.
Wire directly to the switch according to circuit
requirements. Terminals are marked common
(C), normally open (NO) and normally closed
(NC).

SETPOINT ADJUSTMENTS

Setpoints are changed by means of the setpoint
adjusters. Series PSW370 switches 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.

SETPOINT ADJUSTMENT

Remove cover. For setpoint adjustment on
either increasing or decreasing pressure to
within ±1% 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.