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its normal. big knob needs to release the gas to the gauge.
CO2 setup
I just started up my planted tank. My co2 tank was got as a 2nd hand while the solenoid was brand new from LFS. After 2nd day of operation (solenoid was on 4 hours daily), I realised that the psi dropped from 1000 to 0 gradually. In between, I did a leakage check with soapy water, but I did not detect any leakage. Upon trying to turn the big knob of the co2 tank, I noticed that it was not fully turned to open. While I turned to open it fully, the psi returned to 1000 and it was operating normally now. Had anyone experience this before? Can a knob not fully open cause this issue? Is this normal?
its normal. big knob needs to release the gas to the gauge.
I agree that the knob is to release the gas to the regulator. It is really interesting to know how it works as the gas can last for a few hours when the knob is slightly but not turned to fully open. Does the number of turns a knob makes correlate with the volume of gas released from the tank?
Originally Posted by hann
the big knob controls the amount of gas released from the tank to the gauge. The number of turns is not proportional to the volume/pressure of gas. For new tanks, it may be proportional, for older tanks, the knobs are sometimes stuck. I have one tank that if you turn the knob half a turn, the valve opens fully. another new tank that does not have the same behavior.
Therefore the use of a good CO2 valve and gauge. the amount of gas released from the tank to the CO2 line should be controlled by the knob extending from the CO2 gauge.
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