Omega Engineering PSW495B Installation Instructions

®
PSW495B
INSTRUCTION
SHEET
INSTALLATION INSTRUCTIONS FOR OMEGA
STANDARD RANGES
30˝ Hg Vac
30, 60, 100, 200, 400, 600,
1000, 2000, 3000 psi
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.
ENGINEERING, INC.
M3421/0902
PSW495 EXPLOSION-PROOF SWITCH
WIRE LEADS
18˝ LONG
1.50
6.4
(156)
2.00
(51)
ELECTRICAL CONNECTION
The PSW495 switch is available in
SPDT or (2) SPDT circuit. Wire leads
(18˝) are provided for both switches.
SPDT
Common
Normally Open
Normally Closed – Red
Ground
(2) SPDT
Common
Normally Open
Normally Closed – Red
Common
Normally Open
Normally Closed – Red/Black
Ground
ELECTRICAL RATING
(General Purpose)
11A 125/250Vac resistive;
5A 30Vdc resistive
(Narrow Deadband)
5A 125/250Vac resistive
(Gold Contacts) 1A 125Vac
(38)
(5)
.21 DIA. THRU
MOUNTING
HOLES
2 PLACES
1.15
(29)
– White
– Blue
– Green
– (JJ) White/Black
(LL) White/Green
– Blue
– Black
– Blue/Black
– Green
ORDER CODE
SPDT
J
P
L
®
1
⁄ NPT MALE
2
1.50
(38)
1 ⁄ NPT FEMALE
2
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 Allen wrench is used to adjust the
⁄ ˝
64
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
DPDT
been achieved raise and lower pres-
JJ
sure to ensure that setpoint is correct.
After installation of the control
N/A
replace the cover to protect internal
LL
parts from the environment.
M3421 8/99 DPS-5C-1P-10/99 Printed in U.S.A.
1.7
(43)