Omega Products PSW-12 Installation Manual
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User’s Guide
PSW-12 SERIES
Pressure Switches
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IMPSW12
GENERAL
The PSW 12 switch utilizes a diaphragm sensor to detect a pressure change. The response, at a predetermined set point, actuates
a SPDT snap-acting switch, converting a pressure signal into an
electrical signal. Control set point may be varied by turning the
internal slotted adjustment screw according to procedures outlined
in this document.
Tools Needed
1 1/16” Open end wrench
MOUNTING
ALWAYS LOCATE UNITS WHERE SHOCK, VIBRATION AND
AMBIENT TEMPERATURE FLUCTUATIONS ARE MINIMAL.
DO NOT MOUNT IN AMBIENT TEMPERATURE AREAS
EXCEEDING 203° F (IF UL/cUL APPROVAL IS APPLICABLE) OR
176°F (IF CENELEC APPROVAL IS APPLICABLE). IF SEVERE
PRESSURE SURGES ARE EXPECTED, USE SNUBBER .
MOUNT USING PRESSURE CONNECTION: ALWAYS USE
A WRENCH ON PRESSURE CONNECTION WRENCH FLAT.
UNIT MAY BE MOUNTED IN ANY POSITION. HOWEVER,
IF INSTALLATION LOCATION RESULTS IN FREQUENT
EXPOSURE TO LIQUID IT IS RECOMMENDED THAT THE
UNIT BE MOUNTED VERTICALLY WITH THE PRESSURE CONNECTION DOWN. IF UNIT IS TO BE SET AFTER MOUNTING, VERIFY
THAT ADJUSTMENT OPENING IS ACCESSIBLE. “FRONT” MARKING ON NAMEPLATE MUST FACE THE OPERATOR.
Please read all instructional literature carefully and thoroughly before starting.
Explosion Proof
Pressure Switch
Part Number
PSW-12 Series
Part I - Installation
1/2” NPTM
When panel mounting, mount through 7/8” clearance hole in panel.
Hold in place with serrated 1/2” conduit nut. Always support the unit by
holding a wrench on the hex.
TO ATTACH CONDUIT CONNECTION, HOLD ELECTRICAL
CONNECTION STEADY WITH WRENCH ON HEX, THEN
THREAD ON CONDUIT.
Surface Mounting Bracket
Open the adjustment cover and orient the unit so that adjustment opening will be accessible when the switch is mounted. Close the adjustment cover ensuring that the bracket does not interfere with the cover.
Failure to do so may result in improper sealing of adjustment cover.
Mount assembly in desired location.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING
UNIT. ELECTRICAL RATINGS STATED IN LITERATURE AND
ON NAMEPLATE MUST NOT BE EXCEEDED. OVERLOAD ON
A SWITCH CAN CAUSE FAILURE ON THE FIRST CYCLE.
WIRE IN ACCORDANCE WITH LOCAL AND NATIONAL ELECTRICAL CODES.
1/2 NPTM conduit connection is provided on top of the unit with
18” leadwires. Unit is available with SPDT or DPDT operation.
External grounding screw and clamp is provided with option GND.
Leadwires are color coded:
TERMINALS SPDT DPDT
SWT1 SWT2
Common Brown Brown Yellow
Normally Closed Red Red Black
Normally Open Blue Blue Violet
Ground Green Green
UL listed,cUL certified
Industrial Control Equipment
For use in Hazardous Locations
Class I, Division 1 & 2, Groups A, B, C, D
Class II, Divisions 1 & 2, Groups E, F, G Class III
Ambient Temp. Range= -50°C (-58°F) to 95°C (203°F)
UL, cUL File #E40857
NOTE: External grounding screw (- GND) is
required for non-metallic conduit systems.
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