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neilh20 wrote a new post 7 years, 8 months ago

As part of a team in 2013 I worked on a remote river monitoring project, with partners Cemar.org and a local chapter of The Nature Conservancy. This was related, but not part of and in a different watershed, […]
- RTR replied 7 years, 1 months ago
  
  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
- neilh20 replied 7 years, 1 months ago
  
  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