Campbell Scientific HMP60 Temperature and Relative Humidity Probe - Manual (Page 18)

HMP60 Temperature and Relative Humidity Probe
The temperature and relative humidity signals from the HMP60 are measured
using two single-ended analog measurements (VoltSE() in CRBasic or
Instruction 1 in Edlog).
The probe output scale is 0 to 1000 millivolts for the temperature range of
-40
° to +60°C and for the relative humidity range of 0 to 100%. Tables 7-2
and 7-3 provide calibration information for temperature and relative humidity.
TABLE 7-2. Calibration for Temperature
Units Multiplier
(degrees mV -1 )
Offset
(degrees)
Celsius 0.1 -40
Fahrenheit 0.18 -40
TABLE 7-3. Calibration for Relative Humidity
Units Multiplier
(% mV -1 )
Offset
(%)
Percent 0.1 0
Fraction 0.001 0
TABLE 7-4. Wiring for CR1000 and CR10X Examples
Description Color CR1000 CR10(X)
Temperature Black SE 1 SE 3 (2H)
Relative Humidity White SE 2 SE 4 (2L)
Signal & Power Reference Blue G G
Power Brown 12 V 12 V
Shield Clear G
7.4.1 Example for CR1000
'CR1000
'Created by SCWIN (2.1)
Public AirTC
Public RH
DataTable(Table1,True,-1)
DataInterval(0,60,Min,0)
Average(1,AirTC,FP2,0)
Sample(1,RH,FP2)
EndTable
BeginProg
Scan(5,Sec,1,0)
'HMP60 Temperature & Relative Humidity Sensor measurements AirTC and RH:
VoltSE(AirTC,1,mV2500,1,0,0,_60Hz,0.1,-40.0)
VoltSE(RH,1,mV2500,2,0,0,_60Hz,0.1,0)
If (RH>100) And (RH<108) Then RH=100
CallTable(Table1)
NextScan
EndProg
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