INSTALLATION INSTRUCTIONS
31-00147-01
20
P7635 Differential Air Pressure
Sensors
PRECAUTIONS
• Remove Power Before Wiring. Never Connect Or
Disconnect Wiring With The Power Applied. Do Not
Allow Live Wires To Touch The Circuit Board.
• An Isolation Transformer Is Recommended When
Powering The Device With 24vac.
• Do Not Run The Wiring In Any Conduit With Line
Voltage.
• Failure To Wire Devices With The Correct Polarity
When Using A Shared Transformer May Result In
Damage To Any Device Powered By The Shared
Transformer.
• Do Not Remove The Cover. All User Features Are
Accessible From The Outside Of The Unit
MOUNTING
Using the two #8 x 3/4-in. self-drilling mounting screws,
or the integrated 35mm DIN rail clip on the back, mount
the unit vertically with the brass fittings pointing toward
the ground.
Attach the unit to the mounting surface using the two
mounting openings located on the top and bottom
flanges. This ensures that any condensation that may
form in the tubing does not have an effect on the pressure
sensor. If mounting the unit horizontally, a slight zero shift
may occur and care must be taken to prevent moisture
from building up in the sensor.
WIRING
Shielded cable with 16 to 22AWG conductors is
recommended. Use the Wiring Connections table below to
determine the proper wiring for your application. Insert the
wire into the depluggable terminal block sockets and
tighten the screws. In some circumstances, it may be
easier to remove the terminal blocks while connecting the
wires.
NOTE:
When using a shielded cable, be sure to connect
only (1) end of the shield to ground at the control-
ler. Connecting both ends of the shield to ground
may cause a ground loop. When removing the
shield from the sensor end, make sure to properly
trim the shield to prevent any chance of shorting.
Pressure Connections
The recommended connection tubing is ¼” push-on
tubing (1/8” – 3/16” I.D.). Keep the tubing runs as short as
possible so as to not affect the response time.
1-11/32
(34)
3-1/2
(89)
M37385
ZERO
2-3/32 (53)
23/64
(9)
3/8
(10)
7/64
(2)
Table 1. Wiring Connections
Output signal
Supply
Voltage
Wire Connections
VDC
AC/DC
VIN
GND
OUT
mA
AC
VIN
GND
OUT
mA
DC
VIN
OUT