Relative Humidity sensors
42 Carrier Sensors
Typical power wiring diagrams for Space RH sensors
Power supply Power supply
Controller
Gnd In1 In2 In3
-VDC+
RH Transmitter #1
RH Transmitter #1
RH Transmitter #1RH Transmitter #2
DC power, 2-wire 4–20 mA current output
Controller
Gnd In1 In2 In3
-VDC+
DC power, 3-wire 0–10 Vdc output
Controller
Gnd In1 In2 In3
AC power, 3-wire 0–10 Vdc output
Vin Io Vin Io Vin Gnd Vo
Vin Gnd Vo
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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