®
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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