The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #32 of (permalink) Old 11-11-2012, 06:10 PM Thread Starter
No more Bow ties
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it uses IR (non-dispersive infrared (NDIR)) to read the CO2 spectrum. It lights up when plugged in. It has 2 air ports for air movement. I think the issue when I dunked it in water, the breather bag collapsed to plug up the air ports. I'm building a proper plastic box for it now with a breather bag membrane. I'll use rubber bands to hold the bag on. I'll have to find something heavy to glue to the box so it would sink.

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From looking at the ppm in the air, it shifts from 400ppm - 500ppm. I'm thinking it'll shift back and forth as well in water. So I'll plan to take the average reading within a certain time frame like 10 seconds or so.

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