The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #68 of (permalink) Old 12-04-2012, 04:35 AM
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Originally Posted by mistergreen View Post
I made my own silicone membrane between 2 pieces of wax paper.

It's 1 mm in thickness about 3x as thick as the breather bag. It's also twice as reactive allowing about 2ppm per minute.

I also finished building the relay connections and will hook it up later today. I'll run for a month and observe fish reaction and BBa.

** oh, I just figured there's a mathematical limit to this sensor. You can only read 0 - 44.01 ppmw (this is what we want) and 0 -10,000 ppmv. It's good for growing plants. I probably had higher CO2 levels in my tank. I thought it looked suspicious that it stopped at 44.01ppm every time. I knew there's a reason why my fishes were so skittish.
Wow, that is really carrying DIY to an extreme! Could you make a membrane about a tenth as thick? A mm seems much too thick to get fast response. Could you provide some details about how you made the membrane?

I don't think 44 ppm is high enough as an upper limit. I know Tom Barr has used higher levels of CO2 for some of his tanks, without sacrificing fish as a result. I think about 60 ppm would be the minimum desired max limit.

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