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Omega Engineering PSW495B Installation Instructions

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2

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 pre-

cision built U.L. approved control

device which features a single or

dual SPDT, hermetically snap-action

switch. Several wetted material con-

structions 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 tight-

ening control to pressure line, always

use the hex on the pressure connec-

tion. 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 pres-

sure 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