Omega Products PSW-700 Installation Manual

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User’s Guide

PSW-700 SERIES

Pressure Switches

Shop on line at

IMPSW700-01

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

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Customer Service: 1-800-622-2378 / 1-800-622-BEST

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Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

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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.

Types PSW-710, 720, 730

Mount controls vertically (pressure connection facing down, See Figure
1a) or horizontally (electrical conduit facing up, See Figure 1b). Either
mounting position will properly orient the venting system. Control may
be surface mounted via the four 1/4" screw holes on the enclosure or
mounting bracket. It can also be mounted directly to a rigid pipe using
the pressure connection.

WIRING

DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING
UNIT. WIRE UNITS ACCORDING TO NATIONAL AND LOCAL

ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE
SIZE IS 14 AWG. THE RECOMMENDED TIGHTENING TORQUE FOR
FIELD WIRING TERMINALS IS 7 TO 17 IN-LBS.

ELECTRICAL RATINGS STATED IN LITERATURE AND ON
NAMEPLATES MUST NOT BE EXCEEDED—OVERLOAD ON
A SWITCH CAN CAUSE FAILURE ON THE FIRST CYCLE.

TO PREVENT SEIZURE OF ENCLOSURE COVER, DO NOT
REMOVE LUBRICANT (PETROLATUM). THREADS SHOULD
ALSO BE FREE OF DIRT, ETC.

GENERAL

MISUSE OF THIS PRODUCT MAY CAUSE EXPLOSION
AND PERSONAL INJURY. THESE INSTRUCTIONS MUST
BE THOROUGHLY READ AND UNDERSTOOD BEFORE
UNIT IS INSTALLED.

The PSW-700 Series pressure and differential pressure
controls are actuated when a bellows, diaphragm or piston sensor
responds to a pressure change. This response at a pre-determined
set point(s) actuates a SPDT, dual SPDT or DPDT snap-acting
microswitch(es), which converts the pressure signal into an electri­cal signal. Control set point(s) may be varied by turning the internal
adjustment hex (PSW-720, 730) or the external knob and pointer(s)
(PSW-710) according to the procedures outlined below.

PROOF PRESSURE LIMITS STATED IN THE LITERATURE
AND ON NAMEPLATES MUST NEVER BE EXCEEDED,

EVEN BY SURGES IN THE SYSTEM. OCCASIONAL OPER­ATION OF UNIT UP TO MAXIMUM PRESSURE IS ACCEPTABLE
(E.G. START-UP, TESTING). CONTINUOUS OPERATION SHOULD
NOT EXCEED THE DESIGNATED OVER RANGE PRESSURE.

Proof Pressure

The highest pressure to which a sensing element may be occasion­ally operated without adversely affecting setpoint calibration and
repeatability.

TOOLS NEEDED

Screwdriver

Adjustable Wrench to 11⁄2"

MOUNTING

ALWAYS HOLD A WRENCH ON THE PRESSURE
HOUSING HEX WHEN MOUNTING UNIT. DO NOT
TIGHTEN BY TURNING ENCLOSURE. THIS WILL DAMAGE

SENSOR AND WEAKEN SOLDER OR WELDED JOINTS.

INSTALL UNITS WHERE SHOCK, VIBRATION AND
TEMPERATURE FLUCTUATIONS ARE MINIMAL. ORIENT

UNIT TO PREVENT MOISTURE FROM ENTERING THE
ENCLOSURE. IT IS IMPERATIVE TO USE PROPERLY RATED
EXPLOSION-PROOF SEALING FITTINGS FOR ELECTRICAL WIRE
ENTRY. DO NOT MOUNT UNIT IN AMBIENT TEMPERATURES
LOWER THAN -40°F (40°C) OR HIGHER THAN 160°F (71°C).

Please read all instructional literature carefully and thoroughly before starting.

UL listed, CSA Certififed,
FM approved
Class I, Division 1, Groups B*, C, D
Class II, Division 2, Groups E, F, G
Class III

Part I - Installation

Explosion-Proof Pressure and
Differential Pressure Switches

Part Numbers: PSW-701 - 717

PSW-721 - 726
PSW-731 - 735

Vent Holes

Figure 1a: PSW-710

Potted Conduit Connection

Figure 1b: PSW-720, 730

Vent Holes