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AquaticTechTank.net • View topic - Co2 Sensor version 2!

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mistergreen
PostPosted: Fri Nov 13, 2015 11:15 am 
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This is the log overnight. The response rate is surprisingly slow with this sensor. The rate is faster out of water. I guess the volume of air inside the encasing is too much for a fast response.
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mistergreen
PostPosted: Sat Nov 14, 2015 12:11 pm 
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So the response rate is about .005ppmw per second. It takes 7 or so hours to go from 1ppmw to 70ppmw.
I'm going to try to reduce/ seal off the area around the membrane and feed the gas in that chamber directly to the CO2 sensor via an air tube.
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mistergreen
PostPosted: Sat Nov 21, 2015 9:22 am 
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I tried this new configuration where the cap in front seals off a section and the tubes run directly into the CO2 sensor. The fan and humidity sensor is in front.


The response rate is .003ppmw/sec. Slower that the original design.
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