I would take that bottle back. Maybe put it in a fridge/freezer until then. I believe you have a dangerous situation there if your gauge is indeed past maxed out. Possibly you could try just 'blowing' some off outdoors. This will cool the bottle and get rid of the extra? I'm no expert in compressed gases but it would seem your bottle is overfilled by a good amount. Some copy pasta:
How much liquid is in a "full" tank? Why not fill it up?
A "full" tank contains about 34% liquid CO2. If it is filled any more, the CO2 will become very sensitive to temperature changes, with a small increase in temperature causing a large increase in pressure. This is a dangerous situation which is avoided by only partially filling the CO2 bottle.
One cubic inch of water weighs 0.577 oz and the specific gravity of liquid CO2 is 1.977 gm/cc so one ounce of liquid CO2 has a volume of 0.877 cubic inches. CO2 bottles generally have a full-fill to volume ratio of about 2.57 cubic inches per ounce of CO2, so that one ounce of CO2 will take up 0.877/2.57 = 34% of the total volume of the bottle.
The figure of 68% is often quoted as the volume of liquid in a full bottle, but this error probably stems from translating "ounce" into volume using water as the standard. Water is 1.00 gm/cc, or about half the density of liquid CO2 so that if a CO2 bottle is filled to its rated capacity with water, it will be 68% liquid by volume.
What's the burst pressure?
CO2 bottles contain copper "burst disks" which will blow out above a certain pressure and release the contents of the bottle into the air in a relatively safe manner. The blowout pressure of burst discs vary with manufacturer but the minimum value is about 2200 psi and the maximum value is about 2800 psi.
45g fluval bowfront tank, plant 2.0 light, 206 canister and ac30 hob filters, 5lb co2 art pro se
10g quarantine tank
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