I'm not sure I understand what the purpose would be in an aquarium? Would this help you measure the flow from a filter or something? Not sure why you'd find that useful?
So are you talking about measuring co2 flow?
If so, sounds very interesting.
I do something similar. Beats the heck out of a bubble counter.
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Great question. I only kept the bubble counter in line while I tried to figure out how what I was seeing was related to the actual flow rate.That would make a little more sense! Why do you run that along with the bubble counter?
Yes as noted above, if you are going to use a meter it must be able to measure within the range of your output (flow).You would probably need a flow meter that has a lower resolution.
Let's assume the diameter of a CO2 bubble is approximately 5 mm (2.5 mm radius).
This gives a sphere with a volume of ~65 cubic mm. This translates to 0.065 cubic centimetres.
If you are injecting at 1 bubble/second, this will result in 3.9 cubic centimetres of CO2 per minute.
Of course, if you are injecting much faster, than a flow meter would work just fine.