The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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Old 11-04-2012, 01:25 AM   #5
mistergreen
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Oh, there is a difference between ppm in air and in water. Read the text below the calculator.
http://www.lenntech.com/calculators/...er-million.htm

I'll have to study it to get the math. That was my confusion when I wrote to the manufacturer.

So I can hook this sensor to an arduino (in side a drop checker or breather bag) and have the arduino do the math for water (by weight) and control the solenoid to get the proper co2 concentration.
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