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CMP6, CMP10, CMP11, and CMP21 Pyranometers
11
FIGURE 7-5. Exploded view of the pyranometer
7.3 Wiring
Pyranometers purchased from Campbell Scientific have different
wiring than pyranometers purchased directly from Kipp & Zonen.
provides a schematic of the thermopile contained in these
pyranometers.
Red
Blue
Black
FIGURE 7-6. Thermopile detector schematic
Connections to Campbell Scientific data loggers are given in TABLE
(CMP6, CMP10, and CMP11) and TABLE
(CMP21). Solar radiation can
be measured by using either differential or single-ended analog terminals. The
differential measurement has better noise rejection and is therefore
recommended. For differential measurements, a user-supplied jumper wire
needs to be connected between the low side of the differential input and ground
to keep the signal in common mode range. Single-ended and voltage excitation
terminals are used to measure the CMP21 internal thermistor.
NOTE
White (+)
Black (-)
Shield
Mounting screws
Levelling screw
Pyranometer
Bubble level
Nylon washers
Sun shield