User guide

Installation and Maintenance Instructions
for Ashcroft A-Series Miniature
Explosion Proof Pressure Switches
INTRODUCTION
The APS and APA pressure switch have 316 stainless steel
housing and process connections. The APS has a factory fixed
setpoint which cannot be changed in the field. The APA is field
adjustable and can easily be adjusted by following the instruc-
tions in the diaphragm above.
ELECTRICAL CONNECTION
The APS and APA switch is available with wire leads and con-
duit connections. Refer to the figure on other side for wiring
color codes.
• Only trained and skilled personnel are allowed to attach the
wires to the electrical terminals of the switch.
• Cable couplers, glands and conduit connectors must have the
correct electrical approvals as required by local electrical codes.
• The ground wire/connector is connected to the switch housing.
MICRO SWITCH RATINGS
CODE VAC RATING VDC RATING
H 5A @ 125/250VAC
5A @ 28Vdc resistive
3A @ 28Vdc inductive
P 3A @ 125VAC 2A @ 30Vdc resistive
G 0.1 A @ 125VAC 0.1A @ 30Vdc resistive
L 1A @125VAC
1A @ 28Vdc resistive
0.5A @ 28Vdc inductive
© 2012 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.
I&M009-10046 (250-2966) Rev. 07/13
SLIDE COVER DOWN TO ACCESS
SETPOINT ADJUSTMENT SLIDE COVER
UP TO CLOSE AND SEAL ADJUSTMENT
ROTATE LEFT
<
TO INCREASE SETPOINT
ROTATE RIGHT
>
TO DECREASE SETPOINT
Ø .095 OR SMALLER TOOL
REQUIRED TO ROTATE NUT
APA APA APS
LOOK FOR THESE MARKS ON OUR PRODUCTS
Sira 13ATEX1123X
IECEx
CSA 13.0015X
SIL 3 C APABLE