Issues with SEN0554 turbidity sensor in lower ranges.

Hello

I have bought the SEN0554 to test in the range of 0~150 NTU. As I couldn’t really verify the attached curve in the wiki, I decided to test against a regular turbidity meter. I have tested with 1 l of water and consecutive drops of milk (1 drop in this volume is ~ 5 NTU).

I have tested both “Controller reads dirty data” and “Peripheral reads AD data” in both “3,3V” and “Vin”. Up to a range to 30 drops of milk (~150 NTU) there is no change in value. With much higher concentrations, the value changes accordingly.

Is there a way to increase accuracy in the range of 0-150 NTU?

Also there is a calibration mentioned in the wiki, however there is no guide on how to calibrate. Could that help?

Kind regards

Felix