The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #77 of (permalink) Old 12-06-2012, 03:50 PM
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,680
I suspect that the sensor time lag is the reason for the still low ppm reading after one hour. Unless the sensor can reach the equilibrium reading in just a few minutes, its time lag will keep you from seeing the actual ppm of CO2 as it rises. That is why I think you need a "faster" membrane. I also think that the actual ppm in the water will reach equilibrium in less than an hour, probably a lot less, unless you have really poor water circulation in the tank. (Too bad I can't prove this!)

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