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Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, an initiative of Stroud Water Research Center designed to help people advance knowledge and stewardship of fresh water. 
on first look at your data I assumed the diurnal fluctuation of the stream level was due to evapotranspiration during the day of streamside trees and then the lack there of at night — it seems the pattern holds as expected
I have seen that in other gauged sites particularly where this is a lot of upstream forest — cheers!
Paul
Hi Paul
Thanks for the comment. Yes that’s the intent – find out how much the stream is varying, which could be the diurnal fluctuation of the stream level, or other temperature dependent measurement errors.
In this case – the logger uses 4-20mA and a static resistor is used to simulate the sensor – holding the apparent reading relatively constant while the air temperature fluctuating quite severely 30C over a day.
This is an acceptance test on the U30 logger to verify it doesn’t introduce unexpected temperature error as per its specification.
In this case the logger + resistor induced variation across the day is 0.004′ ~ which is the limit of the ADC 12bit specification.
So the loggers are in good shape.
regards