Omega PSW-180 - Manual

PSW-180 SERIES

Differential Pressure Switches

I N S T R U C T I O N

S H E E T

M-1477/0500

N E V E R T I G H T E N B Y T U R N I N G T H E
CONTROL INTO THE FITTING.

MODELS PSW-181, 182, 185, 186 HAVE
A POLYSULPONE PORT WITH 1/4” NPSF
T H R E A D. A 1 / 4 N P T O R 1 / 4 N P S

F I T T I N G M AY B E U S E D W I T H T H I S
CONNECTION. HOWEVER, IN BOTH CASES, THE
MATING FITTING WILL BOTTOM-OUT IN THE
PRESSURE CONNECTION. THEREFORE, WITH
T H E S E M O D E L S, T E F LO N TA P E M U S T B E
APPLIED TO FITTING FOR A TIGHT SEAL. DO
NOT OVER TIGHTEN. CONNECTION TORQUE
M U S T N OT E XC E E D 2 F T. / L B S. O V E R
TIGHTENING MAY DAMAGE THE PORT.

WIRING

ALL LIVE SUPPLY CIRCUITS MUST BE
DISCONNECTED BEFORE WIRING THE
C O N T RO L . F O R E N C LO S E D U N I T S ,

C O N N E C T T H E C O N D U I T TO T H E H O L E I N
ACCORDANCE WITH NATIONAL AND LOCAL
CODES. BRING WIRES UP TO THE TERMINALS
FROM THE REAR. MAXIMUM RECOMMENDED
WIRE SIZE IS 16 AWG.

Unscrew terminal just enough to put stripped
wire under terminal block clamp.

Tools Needed

Screwdriver

Use screwdriver to turn external adjusting screw
on the side. Turn “in” (clockwise) to increase
pressure setting. For best setting accuracy, set the
s w i t ch u s i n g t h e a c t u a l w o r k i n g p r e s s u r e s
encountered in the application.

GENERAL

The PSW-180 differential pressure switch utilizes
dual diaphragm sensors to monitor the difference
in pressure between two sources.

Tools Needed

Screwdriver to accommodate

customer-supplied mounting screws

Adjustable wrenches (2)

MOUNTING

LOCATE SWITCH WHERE VIBRATION,
SHOCK, AND AMBIENT TEMPERATURE
F LU C T UAT I O N S A R E M I N I M A L . TO

AVOID DAMAGE TO CONTROL, ALWAYS HOLD
THE WRENCH ON THE WRENCH FLATS OR HEX
P O RT I O N O F T H E P R E S S U R E C O N N E C T I O N
WHEN TIGHTENING.

The control can be mounted in any position. Locate
where ambient temperature is above 30°F and
below 160°F.

Surface Mounting

Inser t two #6 screws through mounting ear holes
o n 2 ” c e n t e r s ( Re c o m m e n d e d m o u n t i n g fo r
maximum vibration resistance).

Pipe Mounting

M o u n t u n i t f r o m i t s p o r t ( s ) . A l w a y s h o l d a
wrench on pressure por t when making pressure
connection.

Making Pressure Connection

Use a wrench on the pressure por t and thread a
1 / 4 ” N P T M f i t t i n g i n t o t h e p o r t . B e s u r e t o
connect high pressure source to por t labeled
“HIGH”. Similarly, connect low pressure source
to “LOW”.

Part I - Installation

Part II - Adjustments

Dimensions

MODEL

PORT

DIM A.

DIFFERENTIAL

PRESSURE

PSW-181, 182,

1/4” NPSF

185, 186

Polysulphone

2.75” (69.9 mm)

PSW-183,

184, 187, 188

1/4” NPTF Brass

3.125” (79.4 mm)

IMPSW180-01