Lk3.8 and CMP11 Pyranometer

[georgec]

Hello,

I am trying to use a CMP11 Pyranometer (see https://www.kippzonen.com/Product/13/CMP11-Pyranometer) with Lan Controller 3.8. The sensor supplies a low voltage of 0 to 20 mV in relation to the amount of incoming sun radiation. I have connected the two wire sensor to analog input 1 and I have set up the input at 5v but the value was not as expected (something like 25 (left) with 0.02 (right)). I wonder if I can read precisely such small voltages, under 20mV, with the Lan Controller's analog inputs.

Thank you.

[wilkxt]

for INPA1 5V use gain 10 or 50

[georgec]

Hey Tomek,

Thank you for the answer. I used the gain of 50 but the values obtained differ from the measured values with a milivoltmeter. For example for a measured value with the milivoltmeter of 6.8mv I readed with the controller 1422 in the left box respectively 1.42 in the right box. There are other calibration values that should I care? I have two boxes bellow for calibration and multiplier. Later I moved on the INPA3 for a higher precision but I obtained almost the same values.

[wilkxt]

tray on INPA3 with vin=3.3 and gain 50