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Old 01-05-2004, 03:24 PM   #1
jikhead
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Default Which gauge to use to monitor my O2 bottle

What type of gauge should I use if I want to monitor the full/empty level of my O2 bottle?
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Old 01-05-2004, 03:40 PM   #2
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since when do cars have bottled O2?
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Old 01-05-2004, 04:09 PM   #3
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That would be a good one....o2 injection!!!
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Old 01-05-2004, 04:41 PM   #4
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Quote:
Originally posted by nhluhr
since when do cars have bottled O2?
2004 federal regulations require all US vehicles provide oxygen for cars that see altitudes of 15,000 feet or more.

Persons found operating a vehcile at this altitude withouth o2 provisions will be subject to a 50,000 fine and up to 5 years federal prison.
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Old 01-05-2004, 06:38 PM   #5
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Sorry I meant CO2 bottle
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Old 01-05-2004, 11:51 PM   #6
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Probably just a N2O gague or some other gague that reads pressure. What kind of pressure range does the bottle run at.
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Old 01-06-2004, 12:00 AM   #7
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Use a N20 gauge, I think autometer makes a few.
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Old 01-06-2004, 03:45 PM   #8
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N2O gauges measure pressure, which won't give you a strong indication of how full the bottle is, only what the pressure of the gas sitting on top of the liquid N2O is... this will be heavily affected by temperature and recent usage.

If you want to accurately measure the level of liquid N2O, you need a dip-style level gauge (like they use in underground fuel tanks) but I don't think there are any available that will be cost-effective for a 10lb bottle.

Your best bet is to mentally keep track of how many times you use it vs how many runs you can get out of a bottle.
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Old 01-06-2004, 03:57 PM   #9
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Quote:
Originally posted by jikhead
Sorry I meant CO2 bottle
C02 for an onboard fire extinguisher?
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Old 01-06-2004, 05:02 PM   #10
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Quote:
Originally posted by tolnep
C02 for an onboard fire extinguisher?
Ntercooler?
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Old 01-06-2004, 05:21 PM   #11
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I use the DEI intercooler sprayer
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Old 01-06-2004, 05:22 PM   #12
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you could maybe use a Keg co2 tank style gauge

http://www.beveragefactory.com/draft.../exp-742.shtml

I'll admit, I have no idea if that would do anything for you... but I do know it will read the volume of a co2 tank.. :dunno:
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Old 01-06-2004, 05:23 PM   #13
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Liquid N2O and CO2 have similar pressures at room temperature, so a N2O gauge will work just fine. Like nhluhr said, it's really only reading the pressure of the gas above the liquid (which is at the same pressure). On the gauge, the pressure shown will remain fairly constant while there is liquid left in the bottle. It will fluctuate with temperature, however. Here's a chart:

Liquid CO2 operating pressure vs. temperature
80F=969 psi.
70F=853psi.
60F=747psi.
50F=652psi.
40F=567psi.
30F=491psi.
20F=422psi.

If you can keep the bottle at a fairly constant temp (you should) then the pressure gauge will really only tell you when the bottle is very near empty. It's better than nothing, any other measurement method just isn't cost effective.

Edit: That chart is just an estimation

Last edited by WRXMikeH; 01-06-2004 at 05:51 PM.
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