©Copyright 2015 Dwyer Instruments, Inc.
Printed in U.S.A. 12/15
FR# 440838-10 Rev. 3
SETPOINT ADJUSTMENT
1. Determine the setpoint pressure. The approximate actuation point can be set by
turning the adjustment cap up or down, aligning the top of the O-ring, located above
the cap, with the appropriate scale graduation.
2. Connect tubing or piping from the pressure port on bottom of switch to one leg
of a tee. Connect the second leg to a pressure test gage of known accuracy and in
an appropriate range. The third leg should be connected to a controllable source of
pressure.
3. Connect a volt/ohm meter or other circuit tester to the snap action terminals to
indicate when switching occurs.
4. Slowly apply pressure to the system and note the pressure at which switching
occurs.
5. Operate the switch through several cycles to confirm proper actuation point.
6. Remove test apparatus and attach switch to pressure source and control circuit
wiring. Place switch in service.
Example of how to order:
A1F - O - SS - 1 - 4
1 2 3 4 5
1. Diaphragm Designation:
F - Fluorocarbon
2. Enclosure Designation:
O - Open Construction No Enclosure
3. Housing Material Designation:
SS - 316SS
4. Switch Designation:
1 - SPDT Snap Action Switch
5. Operating Pressure Range Designation:
1 - 2 to 15 psig
2 - 4 to 75 psig
3 - 8 to 225 psig
4 - 16 to 450 psig
MAINTENANCE
Upon final installation of the Series A1F Compact OEM Pressure Switch, no routine
maintenance is required. A periodic check of the system calibration is recommended.
The Series A1F is not field serviceable and should be returned if repair is needed
(field repair should not be attempted and may void warranty). Be sure to include a
brief description of the problem plus any relevant application notes. Contact customer
service to receive a return goods authorization number before shipping.
DEADBAND CHART-PSIG (BAR)
Range
Deadband at
Minimum Range
Deadband at
Maximum Range
2 to 15 (0.14 to 1.03)
4 to 75 (0.28 to 5.17)
8 to 225 (0.55 to 15.5)
16 to 450 (1.1 to 31.0)
2 (0.14)
4 (0.27)
8 (0.55)
15 (1.0)
3 (0.21)
15 (1.0)
25 (1.7)
50 (3.5)
MERCOID
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
A DIVISION OF
DWYER INSTRUMENTS, INC.
