IMPOM100-01
User’s Guide
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PSW-100 SERIES
Pressure Switches
OMEGAnet ® On-Line Service
www.omega.com
Internet e-mail
[email protected]
Servicing North America:
USA:
ISO 9001 Certified
Canada:
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TEL: (203) 359-1660
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FAX: (514) 856-6886
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®
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One Omega Drive, River Bend Technology Centre
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M44 5EX United Kingdom
TEL: +44 (0)161 777 6611
FAX: +44 (0)161 777 6622
Toll Free in United Kingdom: 0800-488-488
e-mail: [email protected]
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.
Pressure Switch
Part Numbers:
PSW-104, 105, 107-118,
120-125, 127-133, 135-139
Please read all instructional literature carefully and thoroughly before starting.
GENERAL
The PSW-104, 105, 107-118, 120-125, 127-133, 135-139
pressure switches are activated when bellows, diaphragm or
piston sensor responds to a pressure change. This response, at
a pre-determined set point, actuates a single snap-acting
switch, converting the pressure signal into an electrical signal.
Control set point may be varied by turning the internal adjustment hex. (See Adjustment -PART II).
On models supplied with an external manual reset button, be sure to
leave sufficient finger space over the reset button for the operator to
reset the control.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE
WIRING.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON
NAMEPLATES SHOULD NEVER BE EXCEEDED. OVERLOAD
ON A SWITCH CAN CAUSE FAILURE ON THE FIRST CYCLE.
Part I - Installation
Tools Needed
Adjustable Wrench
Screwdriver
Hammer (for alternate wire knockouts)
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 IN AMBIENT TEMPERATURES EXCEEDING
PUBLISHED LIMITS.
Controls may be mounted and operated in any position. They
may be surface mounted via the two mounting ears on either
side of the enclosure, or directly to a rigid pipe by using the
pressure connection. Should the control be installed where
condensation is expected, vertical mounting is recommended
as a means of keeping water away from switch terminals.
Never use the enclosure for leverage to hand tighten the pressure connection. Always use a wrench to tighten the pressure
connection to the pipe.To prevent damaging the pressure sensor, use a back-up wrench to hold the hex nut in place when
surface mounting.
WIRE UNITS ACCORDING TO NATIONAL AND LOCAL ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS14
AWG.
Remove the two screws retaining the cover and cover gasket. Two
cast-in knockouts for 1/2” conduit are located on the side and back
of enclosure. These can easily be knocked out by placing the blade
of a screwdriver in the groove and rapping sharply with a hammer. A
1/2” NPT conduit connection is also provided on the left hand side
of the enclosure. The three switch terminals are clearly labeled “common”, “normally open” and “normally closed”. For switches
supplied with leadwires, the following color coding applies:
Grounding screw and clamp (cast in symbol) is provided. Keep the
wire as short as possible to prevent interface with the plunger and
the adjustable differential switch wheel, if applicable.
Manual
Reset
SPDT
Common
Normally Open
Normally Closed
Violet
Blue
Black
Part II - Adjustments
Tools Needed
5/8” Open End Wrench
SOME MODELS HAVE A TWO-PIECE, ADJUSTABLE
PLUNGER. THIS FEATURE IS CHARACTERIZED BY A
3/16” HEX HEAD SCREW INSTALLED IN THE 1/4”
HEX PLUNGER. THE LENGTH OF THIS ASSEMBLY IS
ADJUSTED AT OUR FACTORY AND IS CRITICAL TO THE
FUNCTION OF THE CONTROL.
DURING NORMAL CALIBRATION, THIS ADJUSTMENT
SHOULD NOT BE DISTURBED. HOWEVER, WHEN
REPLACING THE ELECTRICAL SWITCH, IT MAY BE
NECESSARY TO ADJUST THE PLUNGER LENGTH IN ORDER
TO “RE-GAP” THE SWITCH. REFER TO INSTRUCTIONS IN
“PART III-REPLACEMENTS” TO DETERMINE IF REGAPPING
IS NECESSARY.
For set point adjustments and recalibration, connect control
to a calibrated pressure source.
PSW-100, 130
Remove pressure switch cover. Adjust set point by turning
5/8” hex adjustment screw clockwise (in) to raise set point,
or counter clockwise (out) to lower set point. Tension on
adjustment screw can be increased by tightening adjustment
lock onto it. Controls include uncalibrated reference scales
for high, low or mid range settings.
Part III - Replacements
Tools Needed
Screwdriver
Adjustable Wrench
USE ONLY FACTORY AUTHORIZED REPLACEMENT
PARTS AND PROCEDURES. COMPONENTS AVAILABLE FOR REPLACEMENT ARE THE SWITCHES.
OTHER COMPONENTS FACTORY REPLACEABLE ONLY.
DISCONNECT LIVE CIRCUITS BEFORE REPLACING THE
SWITCH.
Switch Replacement (all models)
1. Disconnect lead wires from the terminals.
2. Remove switch mounting screws (2) and take out
the switch and insulator.
3. Insert insulator and replacement switch. Orient
switch plunger over the adjustment screw; tighten
switch mounting screws securely.
Gapping
Turn 5/8” hex adjustment screw in approximately
mid range. This puts a load on the plunger sensor.
Using a 1/4” wrench on the plunger and a 3/16”
wrench on the plunger hex screw, turn hex screw
out from plunger until switch actuates. (If switch is
already actuated proceed to the next step.) Turn
plunger hex screws in, until switch just transfers.
Turn hex screw in a additional 2 - 2 1/2 flats from
this point (approximately 1/3 turn). This will provide
a 9-11 Mil gap. Follow set point adjustment procedure.
4. Check set point according to PART II.
5. Connect wires and replace cover securely.
Dimensions
Model
PSW-104, 105
PSW-107-117
PSW-118-125
PSW-127-129
PSW-130-131
PSW-132
PSW-133
PSW-134-139
PSW-104, 105
Dimension
Inches
7.50
6.25
6.63
6.56
7.03
6.97
7.00
8.44
A
mm
190.57
166.67
168.27
166.67
176.99
177.04
177.80
214.30
PSW-107 - 117, 127 - 129, 130 - 133
PSW-134 - 139
NPT
1/2
1/4
1/2
1/4
1/4
1/4
1/4
1/2
PSW-118 - 125
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 2000 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.
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Process Measurement and Control?
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