Campbell KH20, Product Manual

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Appendix C. EasyFlux
®
DL CR6KH20
C-7
TABLE C-6. Default Wiring for Radiation Measurements Option 2
Sensor Quantity Wire Description Color Terminal
Current Excite Red (cbl 2) VOLT116 X1
Current Return Blue (cbl 2)
VOLT116
⏚
Shields Clear
VOLT116 ⏚
CNR4 4-Way
Radiometer
0 or 1
Pyranometer Up Signal Red VOLT116 Diff 9H
Pyranometer Up Reference Blue
1/
VOLT116 Diff
9L 1/
Pyranometer Down Signal White
VOLT116 Diff
10H
Pyranometer Down
Reference
Black 1/
VOLT116 Diff
10L
1/
Pyrgeometer Up Signal Grey
VOLT116 Diff
11H
Pyrgeometer Up Reference Yellow 1/
VOLT116 Diff
11L 1/
Pyrgeometer Down Signal Brown
VOLT116 Diff
12H
Pyrgeometer Down
Reference
Green 1/
VOLT116 Diff
12L
1/
Thermistor Signal White VOLT116 Diff 4H
Thermistor V Excite Red VOLT116 X1
Thermistor Reference Black
VOLT116 ⏚
Shields Clear
VOLT116 ⏚
1/ Jumper to ⏚ with user-supplied wire
A CNF4 Ventilation and Heater Unit may be used with the CNR4 4-way
Radiometer for more accurate radiation measurements. The CNF4 requires a
solid state relay to control the ventilator and heater. The A21REL-12
4-Channel Relay Driver, sold separately, is recommended. Install the A21REL-
12 inside the system enclosure near the VOLT116 and data logger. TABLE
C-7 lists the wiring connections needed to power and control the A21REL-12;
a CABLE3CBL-1 or similar 3-conductor 22 AWG cable is recommended for
connections from the A21REL-12 to the VOLT116, and a CABLEPCBL-1 or
similar 16 AWG 2-conductor power cable is recommended for power
connections from the A21REL-12 to system 12V power source. TABLE C-8
lists the wiring for the CNF4.