Omega PSW-850 User Manual

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User’s Guide

PSW-850 SERIES

Pressure Switches

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IMPSW850

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.

GENERAL

Pressure variations are sensed by a bellows, diaphragm or piston
sensor which either actuates or de-actuates one, two or three snap­acting switches at a pre-determined set point(s). Set point(s) is
adjusted by turning an internal knob and pointer or internal screw

Tools Needed

Screwdriver

Hammer

Adjustable wrench

MOUNTING

INSTALL UNIT WHERE SHOCK, VIBRATION AND
TEMPERATURE FLUCTUATIONS ARE MINIMAL.

ORIENT UNIT SO THAT MOISTURE IS
PREVENTED FROM ENTERING THE ENCLOSURE. IF UNIT
IS BEING INSTALLED WHERE HEAVY CONDENSATION IS
EXPECTED, VERTICAL MOUNTING
(PRESSURE CONNECTION DOWN) IS REQUIRED. DO NOT
MOUNT UNIT IN AMBIENT TEMPERATURES EXCEEDING
PUBLISHED LIMITS.

PSW-850 Series pressure controls can be mounted in any
position, provided the electrical conduit is not facing up. The
preferred mounting position is vertical (pressure connection
down).

The cast-in knockouts for 3/4” electrical conduit are located on the
side and rear of the enclosure. These can easily be knocked out by
placing the blade of a screwdriver in the groove and rapping
sharply with a hammer.

Mount the unit via the (2) 1/4” screw clearance holes on the enclo­sure. See Dimensions. Units may also be mounted via the NPT
pressure connection.

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.

Please read all instructional literature carefully and thoroughly before starting.

Pressure Controls

Part Numbers:
PSW-852, 853, 855,
856 Series

Part I - Installation

WIRING

DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING.

ELECTRICAL RATINGS STATED IN LITERATURE AND ON
NAMEPLATE SHOULD NEVER BE EXCEEDED. OVER-LOAD
ON A SWITCH CAN CAUSE FAILURE ON THE FIRST

CYCLE.

WIRE UNITS ACCORDING TO LOCAL AND NATIONAL
ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE
SIZE IS 14 AWG.

Connect conduit to the case and wire directly to the switch terminals
according to local and national electrical codes. Bring the wires up to
terminals from the rear of the case. (See fig. 1.) If manual reset switch
or DPDT options are used, lead wires are supplied, color coded as
follows:

ALLOW ENOUGH SLACK SO AS NOT TO AFFECT SWITCH
MOVEMENT WHEN MAKING SETTING ADJUSTMENTS AND
ENSURE THAT THE WIRES ARE NOT TOUCHING THE

COVER WHEN INSTALLED.

NOTE: For larger wire gauges, a one time shift may be
experienced or expected due to space limitations within the enclo­sure. Verify setpoint after installation.

NOTE: The middle switch assembly is omitted for dual switch con­trollers. The outer switch assemblies are omitted for single switch
controllers. Type PSW-852, 853 controls have internal screw adjust­ments and type PSW-855, 856 have cam assemblies for internal cali­brated adjustments.

Switch 1 Switch 2

Common Violet Yellow
Normally Open Blue Orange
Normally Closed Black Red

Figure 1