Campbell Scientific HMP60 Temperature and Relative Humidity Probe - Manual (Page 19)

HMP60 Temperature and Relative Humidity Probe
7.4.2 Example for CR10X
;Measure the HMP60 temperature.
;
01: Volt (SE) (P1)
1: 1
Reps
2: 5 2500 mV Slow Range ;CR510 (2500 mV); CR23X (1000 mV); 21X,
CR7 (5000 mV)
3: 3 SE Channel ;Black wire (SE 3), Blue wire (G)
4: 1 Loc [ T_C ]
5: .1 Mult ;See Table 7-2 for alternate multipliers
6: -40 Offset ;See Table 7-2 for alternate offsets
;Measure the HMP60 relative humidity.
;
02: Volt (SE) (P1)
1: 1
Reps
2: 5 2500 mV Slow Range ;CR510 (2500 mV); CR23X (1000 mV); 21X,
CR7 (5000 mV)
3: 4 SE Channel ;White wire (SE 4), Blue wire (G)
4: 3 Loc [ RH_pct ]
5: .1 Mult ;See Table 7-3 for alternate multipliers
6: 0 Offset
;Limit the maximum relative humidity to 100%.
;
03: If (X<=>F) (P89)
1: 3
X Loc [ RH_pct ]
2: 3 >=
3: 100 F
4: 30 Then Do
04: Z=F (P30)
1: 100
F
2: 0 Exponent of 10
3: 3 Z Loc [ RH_pct ]
05: End (P95)
7.5 Long Lead Lengths
Long lead lengths cause errors in the measured temperature and relative
humidity. The approximate error in temperature and relative humidity is
0.52
°C and 0.52% per 100 feet of cable length, respectively.
When long lead lengths are required and the above errors in temperature and
relative humidity are unacceptable, use the HC2S3 or HMP155A temperature
and humidity probe.
Understanding the following details are not required for the general operation
of the HMP60 with Campbell Scientific’s dataloggers. The signal reference
and the power ground (black) are the same lead in the HMP60. When the
HMP60 temperature and relative humidity are measured, both the signal
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