Cheap CO2 Flow Meter Review

[karel.public]

Short video update. This rotameter is working very good so far. I picked the right size for my 650l tank and it sits dead center of the scale at 30ml/min.
No jumping and seems to show repeatably the same number (I had different rates set as well)
The knob works better when my main needle valve at the regulator is set to say 60ml/min - so they work in series.
But no problem dialing in 2ml/min increments and does not change with the slightest touch like my main Oxyturbo needle valve.

If you don't hear more from me, than it works...

 

[JacksonL]

I have gone digital…





Accurate to about 0.2 ml/minute, range between 0 and 200ml/min.

I have had it going for about a week now and it tracks my mechanical glass ball flow valve exactly.
Just data for now, but next will come a phone warning system if flow is unexpectedly high or low, and then next I would like to get a stepper motor on the needle valve to see if I can reliably get it to set to a commanded flow level.
No more fiddling with a needle valve, put a ml/minute into the phone and the motor slowly turns the needle valve in minuscule degrees until the flow meter steadies on the right number.