Omega PSW495B User Manual

ENGINEERING, INC.

®

PSW495B

INSTRUCTION

SHEET

M3421/0902

M3421 8/99 DPS-5C-1P-10/99 Printed in U.S.A.

INSTALLATION INSTRUCTIONS FOR OMEGA

®

PSW495 EXPLOSION-PROOF SWITCH

INTRODUCTION

The PSW495 pressure switch is a pre­cision built U.L. approved control
device which features a single or
dual SPDT, hermetically snap-action
switch. Several wetted material con­structions for compatibility with
pressure media may be obtained.

Series PSW495 switches have a fixed
deadband which will be within the
limits noted on the nameplate.

MOUNTING

The PSW495 snap-action pressure
switch has an anodized aluminum
body and conduit fitting with a 316
stainless steel pressure port.

Two holes are used to surface mount
the control. Location of the holes is
shown on the general dimension
drawings. Mount on a vibration-free
surface in any orientation. When tight­ening control to pressure line, always
use the hex on the pressure connec­tion. NEVER TIGHTEN BY TWISTING

THE BODY OR THE CONDUIT HEX.

ELECTRICAL CONNECTION

The PSW495 switch is available in
SPDT or (2) SPDT circuit. Wire leads
(18˝) are provided for both switches.

SPDT

Common – White
Normally Open – Blue
Normally Closed – Red
Ground – Green

(2) SPDT

Common – (JJ) White/Black

(LL) White/Green
Normally Open – Blue
Normally Closed – Red

Common – Black
Normally Open – Blue/Black
Normally Closed – Red/Black
Ground – Green

ELECTRICAL RATING

(General Purpose)

ORDER CODE

11A 125/250Vac resistive;

SPDT DPDT

5A 30Vdc resistive J JJ

(Narrow Deadband)

5A 125/250Vac resistive P N/A

(Gold Contacts) 1A 125Vac L LL

ADJUSTMENT OF SETPOINT

A single setpoint adjustment nut is
located centrally inside the cover of
the body. Align bottom of adjustment
nut slot with scale for approximate
pressure setting.

The adjustment nut is locked in place
with a set screw located centrally in
the body below the adjustment nut. A

5

⁄

64˝ Allen wrench is used to adjust the

set screw.

For accurate setpoint calibration use
Omega PCL-1B handheld calibrator
with a pump or Omega deadweight
gauge tester.

As received, the pressure switch will
normally be set to approximately 90%
of the indicated range. Pressurize the
system to the required setpoint and
turn the adjustment nut until switch
changes mode. When the setpoint has
been achieved raise and lower pres­sure to ensure that setpoint is correct.

After installation of the control
replace the cover to protect internal
parts from the environment.

WIRE LEADS
18˝ LONG

(5)
.21 DIA.THRU
MOUNTING
HOLES
2 PLACES

1.50
(38)

1.15
(29)

1.50
(38)

1.7
(43)

6.4
(156)

2.00
(51)

1

⁄

2 NPT MALE

1

⁄

2 NPT FEMALE

STANDARD RANGES

30˝ Hg Vac
30, 60, 100, 200, 400, 600,
1000, 2000, 3000 psi

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.

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 should malfunction, 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 being 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, 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 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. P. O. 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-W

ARRANTY

REPAIRS,

consult OMEGA for cur­rent repair charges. Have the following information avail­able BEFORE contacting OMEGA:

1. P. O. number to cover the COST of the repair,

2. Model and serial number of 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 1999 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 prior written consent of OMEGA ENGINEERING, INC.

MADE IN

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TM

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