# Can I use an industrial flow monitor?

764 Views 6 Replies 4 Participants Last post by  Greggz
I got access to lot of industrial processing scrap from process line rebuilt. I was wondering if I can use them in a tank. The inline flow monitor that I'm considering is from Panasonic.
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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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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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That would make a little more sense! Why do you run that along with the bubble counter?
That would make a little more sense! Why do you run that along with the bubble counter?
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.

Shortly after that picture was taken I removed it.
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.
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.
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).

Trying to equate bubbles per second to cubic centimeters is a crude estimate at best.
Just for a frame of reference, I have a 120 gallon tank. At 20cc per minute, the bubbles were too fast to count. Pretty much a constant stream. Maybe anywhere from 7 to 15 per second?? Who knows? I can't possibly count them with any accuracy.

And for me, I am not really even concerned about what the actual number is. The advantage for me is that it allows me to control my flow in relative terms. Trying to bump up my flow 10% with a bubble counter would be impossible. With the flow meter I can at least adjust my flow in relative terms.

In any event, as mentioned above, it's really only an advantage with larger tanks and high co2 flow rates.
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