5. For pyranometers mounted horizontally, ensure the mounting bracket is horizontal in two
dimensions. For pyranometers mounted at an angle, set the mounting bracket angle to the
desired angle prior to tightening the mounting hardware.
6. Verify mounting hardware is firmly tightened, and that the mounting bracket is at the
desired angle.
4. SR20-D2 wiring
Table 4-1: Pin-out, wire color, function, and data logger connection
Wire color
Pin out
Function
Data logger connection
-PT
-PW
Green
5
2
RS-485A
A-, C (odd)
White
7
4
RS-485B
B+, C (even)
Red
2
1
Power in (12 V) 12V
Black
6
3
Power ground G
Clear
9
5
Shield
⏚
(analog ground)
1
Assumes the sensor directly connects to the data logger.
SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer
3
