Viii. humidity sensor – Xylem WE100 BAROMETRIC PRESSURE TRANSMITTER User Manual
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VIII. Humidity Sensor
a. Humidity sensor specifications.
Output:
4-19mA
Range:
0-100% RH
Accuracy:
+ 2% RH
Operating Voltage:
10-36VDC
Current Draw:
3 mA plus sensor
Warm Up Time:
3 seconds minimum
Operating Temp:
-40° to +55°C
Size of Probe:
1 ½” diameter x 7” long
Weight:
½ lb.
b. The humidity sensor is a three-wire sensor. Three wire sensors use
the red wire for positive voltage, the white wire for the output signal,
and the black wire for ground. Warning: Always connect the
sensor with the power turned off.
c. Do not install the humidity sensor in direct sunlight.
d. A humidity sensor utilizes a thin polymer that varies in dielectric
constant directly proportional to changes in the amount of water vapor
at the sensor element. The element provides a linear voltage output
that is converted into a 4-19 mA sensor output signal.