Ashcroft APA-NS Schematics

Installation and Maintenance Instructions

2.9

2.0

1.2

Ø1.2

1.2

Ø1.2

2.3

2.8

INCREASE
SETPOINT

DECREASE

SETPOINT

GLASS-FILLED

POLYCARBONATE

UPPER HOUSING

BRASS LOWER

HOUSING WITH

1-1/8 HEX

WELDED STAINLESS
STEEL BODY

1/4 NPT MALE
WITH 9/16 HEX

1/4 NPT MALE

#18 AWG-12˝ WIRE

LEADS

for ASHCROFT®A-Series Miniature
Pressure Switches

FIELD ADJUSTABLE (APA) MODELS ONLY

tandard Ranges – 30IMV, 15, 30, 60, 100, 200, 400, 600, 1000 psi

S

APA-NS / APA-RS

ODUCTION

INTR

The APA pressure switch features an all-welded stainless steel
body (APA-NS/RS) or a machined brass pressure connection

le glass-filled polycarbonate upper hous

combined with a dur

ab
ing (APA-NS/RB). Located inside the upper housing lies one
(D/M) SPDT general purpose or gold contact snap acting
switches.The deadband is fixed and the setpoint is field
adjustable.

ring clockwise to increase setpoint, counterclockwise to
decrease setpoint.

arious pressure connections and electrical terminations.

v

The setpoint can be adjusted by rotating the outer

The AP

A pressure s

witch is supplied with

ELECTRICAL CONNECTION

The APA pressure switch is available with many various electri­cal connections; wire leads (L), screw terminals (S), spade ter-

-

minals (T) and a Form C DIN connector (H). Contact factory for
other special connection requirements

When furnished with wire leads, the wires are color coded.

(White-Common, Blue-Normally Open, Red-Normally Closed.)

er to figure below f

Ref

spade and DIN connections

When furnished with a DIN connector the terminal block of
the connector can be removed by first removing the screw from
the center of the connector, then pushing out the terminal block

INST

Torque should always be applied to the hex portion of the body
when installing, never to any other part of the body for it may
alter the setpoint. It is recommended that Teflon tape or other
sealant be used on the threads prior to installing to prevent
leaks in the system.

through the hole in the top of the connector to force it out the
bottom.
block back into housing.

Attach wires to the terminal block then insert terminal

Make all connections according to the figures below and
circuit requirements
Note: Since v

acuum models are already abo

TION

ALLA

atmosphere, the Common and Normally Open (NO) cir­cuit will be closed as received.

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel:[phone], Fax:[phone], www.ashcroft.com
All sales subject to standard ter

ms and conditions of sale

.

I&M009-10046-10/00 (250-2966) GBE 1/07

APA-NB / APA-RB

or identification of ter

.

.

.

minals f

ve the setpoint at

or scre

w,

Installation and Maintenance Instructions

NORMALLY
CLOSED

NORMALLY
OPENED

C

OMMON

M

ARKED

W

/WHITE DOT

COMMON

NORMALLY OPENED

NORMALLY

CLOSED

.25

.43

3.5

2.0

3.2

3.7

2.4

3.2

12

6/250

3

G

DS N

1

2

S

R

for ASHCROFT®A-Series Miniature
Pressure Switches

1 – COMMON
2 – NORMALLY CLOSED
3 – NORMALLY OPEN

SCREW TERMINALS

OTHER OPTIONS

NORMALLY CLOSED

LOAD 1

NORMALLY OPEN

LOAD 2

SP ADE TERMINALS

COMMON

LINE VOLT A GE

WIRING DIAGRAM

FORM “C”

DIN CONNECTOR

© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel:[phone], Fax:[phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale.

SS

I&M009-10046-10/00 (250-2966) GBE 1/07

X3A

CONDUIT CONNECTION