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I'm am refurbishing some old CO2 incubators. I would like to test the precision of the CO2 sensor. There is a sample port on this incubator.

What sorts of methods are commonly used to measure CO2 in these incubators?

Strangely, the manufacturer of the incubator makes no recommendations.

I need to be able to report the measurement as a percentage.

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    $\begingroup$ I would presume calibrating it with a known gas concentrations is what they do at the factory. In my lab, the calibration is done by the servicing company. $\endgroup$ – March Ho Aug 12 '15 at 12:14
  • $\begingroup$ Chemistry SE might be able to come up with a simple way get some known concentrations. $\endgroup$ – jzx Aug 13 '15 at 10:21
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Found this:

http://www.mybacharach.com/fyrite-gas-analyzers.htm

Probably what I need

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