CO2 Tank Regular Gauge Reading

[stressed]

Have a 2.5L CO2 Tank, when I just topped up, it read 1000PSI, when I connected it up to my fish tank and turned it on, the reading dropped to 700PSI.

Did it leak that tremendously or what eh.... ??

How do I interpret the gauges reading? What is it actually measuring.

[David]

Actually it should be the other way round....when a cylinder is just filled using the cold compression method, the reading should be lower and when it warms up the pressure usually goes up.

Between the two readings you have, did you use the same regulator. if so, remove the regulator and check for leaks by using a foamy soap solution and apply it to all possible joins like the main valve, safety valve and the main socket. If this is cleared, attached the regulator on and turn on the main valve. Use the same solution to check the regulator. If this portion is cleared, engage the solenoid and apply the same solution to the gauge joint.

If there are still no leaks, perhaps the gauge could be a little off.

[stressed]

I have been using the same regulator. Did not dismantle.

In fact, after toping up at SOXAL, cylinder was left lying around for a few days first, this should have warmed it up sufficiently.

Upon first turn on with the regulator, was 1000PSI, this morning only 600PSI..will check with the soap water method.

Is it normal for the reading to be decreasing at this rate?

[bclee]

It will depends on how accurate your gauge is.

Normally the gauge should read 900-1000psi. This will indicate that there is liquid CO2 in your tank. The pressure will stay at that level untill all the liquid CO2 is depleted. Only after that the pressure will start reducing.

You cylinder may not be fully filled in your gauge is giving you the accurate pressure reading.

BC