C-1
Appendix C. CR3000 Program for
Measuring Pt-100 Temperature Sensor
The program example C measures the Pt-100 sensor for the body temperature of
the CNR4. This program requires four differential channels to measure the four
radiation outputs, and one current excitation channel and one differential channel
for Pt-100 measurement. The program measures the sensors every 1 second,
performs the on-line processing of the data and stores the following processed data
to a data table called cnr4_data once every 60 minutes. It also stores the raw time-
series data from CNR4 to data table called cnr4_ts.
Minimum Battery voltage
Sample Datalogger panel temperature
Average Short-wave radiation (pyranometer up)
Average Short-wave radiation (pyranometer down)
Average Long-wave radiation (pyrgeometer up)
Average Long-wave radiation (pyrgeometer down)
Average CNR4 thermistor temperature (degrees C)
Average CNR4 thermistor temperature (Kelvin)
Average Corrected long-wave radiation (pyrgeometer up)
Average Corrected long-wave radiation (pyrgeometer down)
Average Short-wave net radiation
Average Long-wave net radiation
Average Albedo
Average Net radiation
Table C-1. Datalogger Connections for Differential Measurement with Pt-100
Function
Wire Colour
CR3000/CR5000
Pyranometer Up Signal
Red
Differential Input (H)
Pyranometer Up Reference
*Blue
Differential Input (L)
Pyranometer Down Signal
White
Differential Input (H)
Pyranometer Down Reference
*Black
Differential Input (L)
Pyrgeometer Up Signal
Grey
Differential Input (H)
Pyrgeometer Up Reference
*Yellow
Differential Input (L)
Pyrgeometer Down Signal
Brown
Differential Input (H)
Pyrgeometer Down Reference
*Green
Differential Input (L)
Shield
Clear
PRT (Pt-100) Current Excitation
Grey
Current Excitation (IX)
PRT (Pt-100) Current Return
Brown
Current Excitation Return (IXR)
PRT (Pt-100) Signal
Green
Differential Input (H)
PRT (Pt-100) Signal Reference
Yellow
Differential Input (L)
Shield
Clear
