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Negative cocentration values

alba Feb 12, 2013 03:32 PM

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.

Grant Feb 13, 2013 12:10 AM

Have you calibrated (zero and span) the instrument recently?

bconrad Feb 13, 2013 03:08 AM

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 *

cafeilde Mar 7, 2013 07:57 AM

After cleaning the EC150's windows,the signal stregth level will back around 1.
The concentration will become a positive value.

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