Dear all,
I'm using an EC150 + CSAT3A anemometer for eddy covariance measurements.
I've observed negative values for CO2 and water concentrations. Why? Shouldn't I get positive values?
Thanks in advance for your help.
Have you calibrated (zero and span) the instrument recently?
It sounds like your zero/span values got entered improperly. I will echo Grant's question. Did you recently attempt a zero span? What are the zero/span coefficients currently?
* Last updated by: bconrad on 2/12/2013 @ 8:09 PM *
After cleaning the EC150's windows,the signal stregth level will back around 1.
The concentration will become a positive value.