Typical Power Wiring Diagrams For Space Rh Sensors - Carrier SPS Installation Manual

Relative Humidity sensors

Typical power wiring diagrams for Space RH sensors

DC power, 2-wire 4–20 mA current output
Power supply
-VDC+
Gnd In1 In2 In3
Controller
CAUTION If using a 24 Vac transformer, use an isolated transformer. If sharing the transformer with your
controller or another device, be sure to connect all of the devices with the proper polarity, since most
controllers are earth grounded. Failure to do so could cause a ground loop that could damage the devices.
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RH Transmitter #1 RH Transmitter #2
Vin Io Vin Io
AC power, 3-wire 0–10 Vdc output
DC power, 3-wire 0–10 Vdc output
Power supply
-VDC+
Gnd In1 In2 In3
Controller
RH Transmitter #1
Vin Gnd Vo
Gnd In1 In2 In3
Controller
RH Transmitter #1
Vin Gnd Vo
Carrier Sensors