Campbell Scientific NR01 Net Radiometer - Manual (Page 20)

NR01 Four-Component Net Radiation Sensor
4.2 Electrical Connections
The NR01 is a passive sensor that does not need any power. However there is
an on-board heating resistor in the pyrgeometer connection body that may be
switched on to prevent dew deposition.
Cables generally act as a source of signal distortion by picking up capacitively
coupled noise. Campbell Scientific generally recommends keeping the distance
between the datalogger and sensor as short as possible. For cable extension,
see Appendix A. Table 4-2 provides the electrical connections of the NR01.
Cable 1 (Solar)
Color
Wire Label
Polarity PCB04
Connection
Red Pyranometer Up Sig + 2
Blue Pyranometer Up Ref - 1
White Pyranometer Down Sig + 8
Green Pyranometer Down Ref - 7
Brown Pyrgeometer Up Sig + 4
Yellow Pyrgeometer Up Ref - 3
Purple Pyrgeometer Down Sig + 6
Grey Pyrgeometer Down Ref - 5
Clear Shield Ground 11, 12
Cable 2 (Temperature/Heater)
Color
Wire Label
Polarity PCB05
Connection
Red Current Excite + 2
Blue Current Return - 4
White PT100 Signal + 3
Green PT100 Signal Ref - 5
Brown Heater Power SW12V + 1
Yellow Heater Ground - 6
Purple Ground GND 7
Grey Shield GND 8
Clear Shield Ground 9, 10
NOTES:
(1) + connections of radiometers give + signal when radiation comes in.
(2) Pt100 red and white end at same side of the sensor (both +)
(3) Pt100 and heater polarity are not critical.
16