3 calculate soil water potential, Calculate soil water potential, 2. excitation and voltage ranges – Campbell Scientific 227-L Delmhorst Cylindrical Soil Moisture Block User Manual
Page 15: Table 7-2
227 Delmhorst Cylindrical Soil Moisture Block
TABLE 7-2. Excitation and Voltage Ranges
Datalogger
mV Excitation
Full Scale Range
CR800/CR850 250
±250
mV
CR1000 250
±250
mV
CR3000 200
±200
mV
CR5000 200
±200
mV
CR9000(X) 200
±200
mV
21X 500 ±500
mV
CR7 500 ±500
mV
CR500/CR510 250
±250
mV
CR10(X) 250
±250
mV
CR23X 200
±200
mV
Do not use a slow integration time as sensor polarization errors
will occur.
NOTE
7.2.3 Calculate Soil Water Potential
The datalogger program can be written to store block resistance or can
calculate water potential from a block calibration. The soil water potential
versus resistance values in TABLE 7-3 are typical values supplied by
Delmhorst Corporation.
9
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