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Old 01-23-2012, 01:58 AM   #1
Jan 2012
duluth, MN
Posts: 6

I got my first 5lb cylinder filled with co2. but it only shows 800psi on the gauge which is in the "order gas" red zone. Did i get underfilled or is this just a regulator for a wide range of cylinders?

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Old 01-23-2012, 02:03 AM   #2
May 2011
Stow, MA
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Sounds normal to me. Check out this cool graph...


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Old 01-23-2012, 02:03 AM   #3
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Dec 2010
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800psi sounds like a proper fill to me. What regulator do you have that lists 800psi as the 'order gas' zone?? Normally, that's when it's below 300psi on the high pressure side.
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Old 01-23-2012, 02:05 AM   #4
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Co2 is sold by weight, not volume. If you stick the cylinder in the fridge, it might show 500 psi. If you take it out, it might show 800 psi. So, that gauge is meaningless. It'll show "order co2" until the tank is more than 90% empty, and then go immediately to "empty" as co2 is a liquid, but is dispensed as a gas.

I've joked about this before, but the best way to deal with with that gauge is to cover it with duct tape.
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Old 01-23-2012, 04:44 AM   #5
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Jun 2011
Johnston, RI
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Most bottles will have the tare weight stamped into them. This is how much it weighs empty. Throw it on a scale and it should be 5lbs heavier than the tare weight when full. I find this to be the most reliable "gauge" to determine how much is left.

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Old 01-23-2012, 04:49 AM   #6
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Jul 2009
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Depends on the temperature.

middle of the page...
co2 info

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Old 01-23-2012, 01:50 PM   #7
Jan 2012
duluth, MN
Posts: 6

this is it here. I guess the red zone starts at 600psi, not 800 like i thought. In the fridge its at about 350 on my first keg. Kind of a useless scale i guess. Would be nice if it showed a max pressure at 1000 or 1500. Its designed for beer kegs, i can't see how anyone would have a bottle in an area over 80 degrees
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Old 01-23-2012, 02:38 PM   #8
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The gauge is useless until all the liquid CO2 is gone anyway. A binary full/empty indicator is just as useful or probably even better because it's not as misleading.
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Old 01-23-2012, 02:51 PM   #9
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Feb 2009
Columbus, Ohio
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If you want to know how much C02 is left in your cylinder as Yooper and Bobby_M stated gauges are useless.

Disconnect your cylinder and weigh it. Now look on the side of the cylinder for "TW" stamped on the shoulder with some numbers flowing the "TW" stamp . Now subtract the TW number for the total weight and you have your remaining Co2 weight.

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Old 01-23-2012, 04:25 PM   #10
May 2010
Chandler, AZ
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^^^^ what bad67z said. TW stands for tare weight, fyi.

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