how much psi of co2 in a full 5lb cylinder - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Bottling/Kegging > how much psi of co2 in a full 5lb cylinder

Thread Tools
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?

Reply With Quote
Old 01-23-2012, 02:03 AM   #2
May 2011
Stow, MA
Posts: 17,817
Liked 3074 Times on 2300 Posts

Sounds normal to me. Check out this cool graph...


Reply With Quote
Old 01-23-2012, 02:03 AM   #3
Golddiggie's Avatar
Dec 2010
Posts: 11,995
Liked 495 Times on 431 Posts

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.
Hopping Tango Brewery

跟猴子比丟屎 ・ Gun HOE-tze bee DIO-se

On Tap: Caramel Ale, Mocha Porter II, MO SMaSH IPA
Waiting/Carbonating: 12.5% Wee Honey II, 8.9% Old Ale, English Brown Ale, Lickah ESB, Mocha Porter II
K2: Epic mead
K3: TripSix
On Deck: Caramel Ale
Mead [bottled]:Oaked Wildflower Traditional, Mocha Madness, Blackberry Melomel, maple wine

Reply With Quote
Old 01-23-2012, 02:05 AM   #4
Ale's What Cures You!
Yooper's Avatar
Jun 2006
UP of Michigan, Winter Texan
Posts: 69,537
Liked 7915 Times on 5540 Posts

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.
Broken Leg Brewery
Giving beer a leg to stand on since 2006

Reply With Quote
Old 01-23-2012, 04:44 AM   #5
Irishwrench's Avatar
Jun 2011
Johnston, RI
Posts: 103
Liked 12 Times on 10 Posts

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.

Reply With Quote
Old 01-23-2012, 04:49 AM   #6
Uncle John's Band
shelly_belly's Avatar
Jul 2009
Blow Southerners!
Posts: 1,656
Liked 189 Times on 149 Posts

Depends on the temperature.

middle of the page...
co2 info

Reply With Quote
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
Click image for larger version

Name:	JO-62K-dualGagueReg-b1.jpg
Views:	1653
Size:	39.5 KB
ID:	44702  

Reply With Quote
Old 01-23-2012, 02:38 PM   #8
Vendor and Brewer
Bobby_M's Avatar
Aug 2006
Whitehouse Station, NJ
Posts: 23,290
Liked 1736 Times on 1101 Posts

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.
Welcome to I love you.
Corny Keg Dry Hop Canisters $26.50 for limited time
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

Reply With Quote
Old 01-23-2012, 02:51 PM   #9
bad67z's Avatar
Feb 2009
Columbus, Ohio
Posts: 1,875
Liked 110 Times on 77 Posts

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.

Reply With Quote
Old 01-23-2012, 04:25 PM   #10
May 2010
Chandler, AZ
Posts: 2,116
Liked 155 Times on 113 Posts

^^^^ what bad67z said. TW stands for tare weight, fyi.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
New CO2 cylinder rcrabb22 Bottling/Kegging 4 05-11-2011 01:07 AM
50 lb cylinder? slakwhere Bottling/Kegging 4 02-02-2010 06:27 PM
how much bottle pressure from full 20lb CO2 cylinder? SenorWanderer Bottling/Kegging 5 12-03-2007 08:26 PM
CO2 Cylinder dougbo Bottling/Kegging 6 12-24-2006 03:23 AM
New 20# Cylinder & Reg EdWort Bottling/Kegging 2 10-18-2006 08:41 PM

Forum Jump