Omega PSW20 Series Instruction Sheet

Pressure, vacuum or differential pressure switches

PSW20 Series

Pressure, vacuum or differential pressure switches

INSTRUCTION

SHEET

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Installation Instructions for OMEGA PSW20 Series: Pressure, Vacuum and Differential

General

The PSW20 series is single pole switch that can be used as a pressure or vacuum switch (from 0.40 in W. C. to

20 inches W. C.) or as a pressure differential switch. The switch can respond to rapid pulsing and the gold

plated silver contacts will handle low level switching currents.

Switch may be mounted in horizontal or vertical position, through 0.12" (3mm) holes on 1.34" (34mm)

centerline, with suitable clearances to accommodate 0.15" I.D tubing and electrical connectors – see diagram

for dimensions.

M4067-0504

Pressure Switches.

Part

Number

Pressure Vacuum Differential

PSW20A

0.4-15

PSW20B

1-20

Pressure range

(inches water, gauge)

0.4-15

.04-15

1-20

Table of Contents

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Page 1 General The PSW20 series is single pole switch that can be used as a pressure or vacuum switch (from 0.40 in W. C. to 20 inches W. C.) or as a pressure differential switch. The switch can respond to rapid pulsing and the gold plated silver contacts will handle low level switching currents.
Page 2 Part Number PSW20A PSW20B Body Diaphragm Contacts Springs Terminals Adjusting screw Weight Operating temperature Listings Connections and Adjustment Pressure Switching – Normally Open Contacts Connect the pressure source to inlet port B (see diagram) and set the adjusting screw to the desired pressure. Turning the screw clockwise narrows the gap between contacts and decreases the pressure set point.
Page 3 Media in Contact with Electrical Contacts Note that the pressure media entering through Port A is in direct contact with the electrical contacts in the switch, whereas the pressure media entering through Port B is separated from the electrical contacts by the diaphragm.
Page 4 European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification. The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.