Omega Vehicle Security PSW495B installation instructions Introduction, Mounting, Spdt

® ENGINEERING, INC.

PSW495B

INSTRUCTION	M3421/0902
SHEET

INSTALLATION INSTRUCTIONS FOR OMEGA®

PSW495 EXPLOSION-PROOF SWITCH

STANDARD RANGES

30˝ Hg Vac

30, 60, 100, 200, 400, 600, 1000, 2000, 3000 psi

WIRE LEADS 18˝ LONG

1.50

(38)

6.4

(156)

2.00

(51)

(5)

.21 DIA.THRU MOUNTING HOLES

2 PLACES

1.15

(29)

1⁄2 NPT MALE

1.50

(38)

1.7

(43)

1⁄2 NPT FEMALE

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. NEVERTIGHTEN BYTWISTING THE BODY ORTHE 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.

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