CO2 Guage Temperature Correction

[iceman80403]

I keep my CO2 tank in my keezer and I know that the tank gauge reads low (~500psi) so logically the output gauge is also low. Does anybody know how inaccurate the gauges are as a function of temperature? It's probably a function of pressure too.

I suppose I could warm up the tank to some standard temperature, say 25*C, set a desired pressure, cool it back to keezer temperature and see what it reads. Then do this again for different desired pressures. Seems like a PITA to me. I'd have to repeat if I decided to use a different temperature.

I'd like to know so I can accurately carbonate my beer. I know I could keep the tank and regulator outside, but I'd prefer to have multiple regulators inside when I eventually upgrade...

Thanks all.

 

[springer]

The low pressure gauge will be accurate at low temps 12 psi is 12 psi no matter what the temp

 

[GilaMinumBeer]

The low pressure gauge will be accurate at low temps 12 psi is 12 psi no matter what the temp

+1. The low end guage, IIRC, is more of a back pressure guage wheras the High guage is a head pressure guage.

Does that make any sense?

 

[Arkador]

The low pressure gauge will be accurate at low temps 12 psi is 12 psi no matter what the temp

+1!
The only reason the high pressure guage changes is because of the liquid CO2 in the tank.

 

[wilserbrewer]

I believe the gauges work fine in the keezer at lower temps. The lower tank gauge reading is just reflecting the actual drop in pressure of the liquid Co2 at a lower temperature. 12 psi line pressure is 12 psi regardless if the tank is inside or outside the keezer.

 

[iceman80403]

Excellent. I'm glad to hear that. Thanks for the quick responses! One less thing I have to do