Omega Vehicle Security Switch PSW495B User Manual

®
ENGINEERING,INC.  
PSW495B  
INSTRUCTION  
SHEET  
M3421/0902  
®
INSTALLATION INSTRUCTIONS FOR OMEGA  
PSW495 EXPLOSION-PROOF SWITCH  
WIRE LEADS  
18˝ LONG  
1
2 NPT MALE  
1.50  
(38)  
1.50  
(38)  
1.7  
(43)  
(5)  
.21 DIA.THRU  
MOUNTING  
HOLES  
6.4  
(156)  
2 PLACES  
1.15  
(29)  
2.00  
(51)  
STANDARD RANGES  
30˝ Hg Vac  
1
2 NPT FEMALE  
30, 60, 100, 200, 400, 600,  
1000, 2000, 3000 psi  
ADJUSTMENT OF SETPOINT  
INTRODUCTION  
ELECTRICAL CONNECTION  
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 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.  
The PSW495 switch is available in  
SPDT or (2) SPDT circuit. Wire leads  
(18˝) are provided for both switches.  
SPDT  
Common  
– White  
The adjustment nut is locked in place  
with a set screw located centrally in  
Normally Open – Blue  
Normally Closed – Red  
the body below the adjustment nut. A  
Series PSW495 switches have a fixed  
deadband which will be within the  
limits noted on the nameplate.  
Ground  
– Green  
5
64˝ Allen wrench is used to adjust the  
(2) SPDT  
Common  
set screw.  
– (JJ) White/Black  
(LL) White/Green  
For accurate setpoint calibration use  
Omega PCL-1B handheld calibrator  
with a pump or Omega deadweight  
gauge tester.  
MOUNTING  
The PSW495 snap-action pressure  
switch has an anodized aluminum  
body and conduit fitting with a 316  
stainless steel pressure port.  
Normally Open – Blue  
Normally Closed – Red  
Common  
– Black  
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.  
Normally Open – Blue/Black  
Normally Closed – Red/Black  
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.  
Ground  
– Green  
ELECTRICAL RATING  
(General Purpose)  
11A 125/250Vac resistive;  
5A 30Vdc resistive  
(Narrow Deadband)  
5A 125/250Vac resistive  
(Gold Contacts) 1A 125Vac  
ORDER CODE  
SPDT DPDT  
J
JJ  
After installation of the control  
replace the cover to protect internal  
parts from the environment.  
P
L
N/A  
LL  
M3421 8/99 DPS-5C-1P-10/99 Printed in U.S.A.  
 

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