Campbell Scientific HMP155A Temperature and Relative Humidity Probe - Manual (Page 21)

HMP155A Temperature and Relative Humidity Probe
TABLE 7-2. Connections for Differential Measurements
Color
Wire Label or
Description CR10X
CR1000,
CR3000,
CR800,
CR5000,
CR23X
CR10,
CR510,
CR500 21X, CR7
Yellow Temp Signal Differential
Input – H
Differential
Input – H
Differential
Input – H
Differential
Input – H
Jumper to White Differential
Input – L
Differential
Input – L
Differential
Input – L
Differential
Input – L
Blue RH Signal Differential
Input – H
Differential
Input – H
Differential
Input – H
Differential
Input – H
White Signal Reference Differential
Input – L
Differential
Input – L
Differential
Input – L
Differential
Input – L
Black Signal Ground G G G
Clear Shield G G
Red Power SW12V 12V/SW12V 12V/SW12V 12V/SW12V* 12V/SW12V*
If using
SW12V,
jumper from
SW12V
Control
to Control Port
*On these dataloggers switched power is only available with the SW12V Power Switch (ordered separately).
TABLE 7-3. Power Connections using SW12V Power Switch
HMP155A SW12V Peripheral Datalogger
Color Description Terminal Wire
Red Power SW12V Red 12 V
Black Power Ground GND Black G*
Green Control Port
*The black wire of the SW12V should be connected to the type of datalogger
ground channel recommended for the HMP155A black wire as listed in
TABLE 7-1 and TABLE 7-2.
7.3 Datalogger Programming
The temperature and relative humidity signals from the HMP155A can be
measured using a single-ended analog measurement or a differential analog
measurement.
Use a single-ended analog measurement when the HMP155A signal lead
length is less than 6.1 m (20 ft.) or if the probe will be turned on and off under
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