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User’s Guide
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PSW-150 SERIES
Differential Pressure Switches
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OMEGAnet®Online Service Internet e-mail
egulations that apply. OMEGA is constantly pursuing certification of its products to the European Ne
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Servicing North America:
U.S.A.: One Omega Drive, P.O. Box 4047
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For immediate technical or application assistance:
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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
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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 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, human applications.
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PSW-150 Series
Differential Pressure Switches
Part Numbers: PSW-151
PSW-152
PSW-153
PSW-154
PSW-155
Please read all instructional literature carefully and thoroughly before starting.
GENERAL
BEFORE INSTALLING, CHECK THE SENSOR MODEL SELECTED FOR
COMPATIBILITY TO THE PROCESS MEDIA IN CONTACT WITH THE
SENSOR AND WETTED PARTS.
The PSW-150 Differential Pressure Switch utilizes opposing metal bellows to
detect pressure differences between two pressure sources. When the pressure
at the high port exceeds the pressure at the low port by a pre-determined
amount (set point), the mechanism operates a single snap-action electrical
switch. Control set point may be adjusted by turning the internal adjustment
hex screw (see Part II - Adjustments).
DIFFERENTIAL PROOF PRESSURE* LIMITS STATED IN THE LITERA
TURE AND ON NAMEPLATE MUST NEVER BE EXCEEDED, EVEN BY
SURGES IN THE SYSTEM. OCCASIONAL OPERATION OF UNIT UP TO
DIFFERENTIAL PROOF PRESSURE IS ACCEPTABLE (E.G., START-UP,
TESTING). CONTINUOUS OPERATION SHOULD NOT EXCEED THE
DESIGNATED MAX WORKING PRESSURE.**
*Differential Proof Pressure
The maximum differential pressure to which a pressure sensor may be
occasionally subjected, which causes no permanent damage (e.g., star t-up,
testing). The unit may require calibration.
**Working Pressure
The pressure range within which two opposing sensors can be safely
operated and still maintain set point adjustability.
THESE PRODUCTS DO NOT HAVE ANY FIELD REPLACEABLE PARTS.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT. WIRE
UNITS ACCORDING TO NATIONAL AND LOCAL ELECTRICAL CODES.
MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAMEPLATES
MUST NOT BE EXCEEDED; OVERLOAD ON A SWITCH CAN CAUSE
FAILURE ON THE FIRST CYCLE.
Remove the four (4) screws retaining the cover and gasket. Remove cover.
Connect conduit to the enclosure using a conduit fitting that is suitable for your
installation. Wire directly to the switch terminals in accordance with local and
national electrical codes. Bring the wires up to the terminals from the rear of
the enclosure to prevent interference with the mechanism.
Part II - Adjustments
Tools Needed
- 5/16" open end wrench
For set point adjustment and re-calibration, connect the "High" pressure por t
to a calibrated pressure source.
Set point adjustment is achieved by varying the gap between the mechanical
actuator and the plunger on the electrical switch
To raise the differential pressure setting, turn the 5/16" hex head screw left
(clockwise).
Part I - Installation
Tools Needed
- Adjustable wrenches (2)
- Phillips head screwdrive
MOUNTING
INSTALL UNIT WHERE SHOCK, VIBRATION AND TEMPERATURE
FLUCTUATIONS ARE MINIMAL. MOUNT UNIT SO THAT MOISTURE
IS PREVENTED FROM ENTERING THE ENCLOSURE. DO NOT MOUNT
UNIT IN AMBIENT TEMPERATURES EXCEEDING PUBLISHED LIMITS.
Surface mount in any position via two mounting ears. Never turn this unit by
grasping enclosure. Always hold a wrench on the bellows housing (or fitting)
when connecting pressure joints.
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To lower the differential pressure setting, turn the 5/16" hex head screw right
(counter-clockwise).
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Dimensions
Dimension A
Models Inches mm NPT
151, 153 8.06 204.7 1/4
152 6.53 165.9 1/4
154 6.88 174.8 1/4
155 6.50 165.1 1/4
Models 151, 153
Model 154
Model 152
Model 155
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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 in which wear is not warranted, include but are 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 the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED 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
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
co mponent upon which liability is based. In no event shall OME GA 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.
total liability of
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 ) NUM BER F ROM O MEGA’S CU STOMER SERVI CE DE PA RT MENT (IN O RDER 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
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.
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 2008 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.
RETURNS, please have the
FOR NON-WARRANTY REPAIRS,
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.
consult OMEGA
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Page 6
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
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