Campbell Scientific HC2S3 Temperature and Relative Humidity Probe - Manual (Page 20)

Model HC2S3 Temperature and Relative Humidity Probe
The HC2S3 output scale is 0 to 1000 mV for the temperature range of
-40
° to +60°C and 0 to 1000 mV for the relative humidity range of 0 to 100%.
Multipliers and Offsets for the measurement instructions to convert the
measurement result (mV) to temperature and relative humidity are shown in
TABLE 7-3 and TABLE 7-4.
TABLE 7-3. Temperature
Units
Multiplier
(degrees mV -1 )
Offset
(degrees)
Celsius 0.1 -40
Fahrenheit 0.18 -40
TABLE 7-4. Humidity
Units
Multiplier
(% mV -1 )
Offset
(%)
Percent 0.1 0
Fraction 0.001 0
7.4.1 Example Programs using Single-Ended Measurement Instructions
The example programs for the CR1000 and CR10X use the SW12V terminal to
switch power to the probe, delay for 3 seconds and measure the output voltages
using single-ended measurement instructions.
Relative humidity and temperature (deg C) are measured on single-ended input
channels 1 and 2 respectively. The program sets relative humidity equal to 100
if the measured value is greater than 100 but less than 103%. Values greater
than 103% are not set equal to 100, and indicate a problem with the sensor or
its calibration.
TABLE 7-5. Wiring for Single-ended
Measurement Examples
Color Description CR1000 CR10(X)
Brown Temperature SE 2 SE 2
White Relative Humidity SE 1 SE 1
Yellow Signal Reference AG
Gray Power Ground AG
Clear Shield G
Green Power SW12V SW12V
Jumper from
SW 12V CTRL
to Control Port
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