Quote:
Originally Posted by VaughnH
I know of no flow meter capable of measuring the tiny, tiny flow rates we use for CO2 injection. When you are talking about 2 bubbles per second that is about 0.00001 cfm, way below the range of flow meters.
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Good point I knew it was low flow, but didn't take the time to guestimate how low of a flow.
Now I've put some thought into it, and looking at my bubble counter I estimate the bubbles to be about 3mm in diameter. When you calculate the volume of a sphere with a diameter of 3mm you come up with 0.0141 cm3. Then if to put it in common units you figure 2 bubbles per second for 60 seconds you get 1.692 cm3/min. This is an extremely low flow.
They do make flowmeters in this range, but they are not the cheap ones I was thinking about. I'm figuring you'd want one with a range of no more than 10 cm3/min and a resolution of at least 0.2 cm3/min or better.
Oh, well it was a thought...
I think it would be neat if they made low range Thermal Mass Flow Controllers in the price range a hobbiest could afford.