Manometric metering help

[Dave_424]

I was wondering if this would be a good setup for metering my paintball tank hybrid:

paintball tank => threaded to a 1/4" ball valve => 1.4" tee with a gauge at the top and a male quick connect at the back

What range of pressure for the gague would I want??? 0-1 BAR ect.

Also if you have a better idea for setting up all of the fittings just give a suggestion

Thanks Dave

[ALIHISGREAT]

for the guage it depends on the maximum mix number, so for 5x you could get a 0-4 bar guage.

[Dave_424]

because I would only really use my compressor (8 BAR) which means a maximum mix of 9

I would only prorably only use about 5 or 6 mix but would like the 9x mix capability

Would This mean that I would have the buy the 0-7 BAR gague from airlines-pneumatics? would it be reliable to read the correct PSI at the lower pressures for lower mixes?

Dave

[DYI]

A 0-15 psig fuel gauge is adequate for mixes of up to 20x, or thereabouts. You can buy +/-1% accuracy ones from McMaster-Carr.

[Dave_424]

How would a 0-15 PSI gague work?

OOOOOOOH would I just use the 0-15 PSI gague for adding the propane to the chamber, But how would I know the PSI that I would be adding from the compressor? Set the regulator for that mix?

If anyone could clear this up it would be a great help

DAVE

[Fnord]

Alihisgreat gave you some fuzzy or inaccurate info, but DYI got it right.

For a 20x mix, you'd need about 15 psi of propane pressure on the gauge, or one chamber volume of propane. For 9x, you'd want about 7 psi, maybe a little less. You'll need to add the propane pressure to the total air pressure you're going to add, otherwise your mix will be off a little.

[SpudFarm]

no need for the expensive gauges. mine works a treat with a cheap one (0-1bar)

[Dave_424]

I have decided on how I am going to do this

chamber => 1/4" ball valve => 1/4" tee => 0-11 BAR gague on top => on end a male quick connect (This is the set up for oxidizing) then for the fueling

Female quick connect => 1/4" tee => 0-1 BAR gague on top => propane source

Dave

Anyone know where to get the propane tank hreads - 1/4" adapter?

[Larda]

I used a single 5000PSI +-0,02% digital gauge to meter both the propane and the air for my hybrid, (0-20% of full scale= +-0,02%, 20-100%full scale=+-0,1% of reading).
I have used it from as low as 5x up to 200x without a problem.

[SpudFarm]

Anyone know where to get the propane tank hreads - 1/4" adapter?

i just went out to a little pipeshop "a really SMALL one!" and brougth my propane tank and said "do you have a fitting so i can get 1/4" threads on this tank?" it is a pretty normal part around here and they will almost certainy have it

[Dave_424]

So would B&Q have the right fitting?

Anyone know of a place online to get one? i can't find one anywhere.

Dave

[psycix]

Dave you could also use two different gauges: a low one for measuring fuel precisely, and a high one for measuring the air pressure.
Make sure to use a ballvalve to protect the low pressure one from higher pressures.


@ Larda,
And what would one pay for such a beauty hmm?

[Dave_424]

Yes Psycix in a post a bit above I have a 0-1 BAR gague on the detatchable fueling meter and then a 0-11 BAR gague permanantly attached to the chamber, with a isolating ball valve of course

Anyone else with an idea to get an adapter in the UK for a propane tank to 1/4" threads?

Dave

[ALIHISGREAT]

you could probably get an 8mm compression fitting on there which i think has 1/4" threads, you really need to get hold of your propane tank first, then its a case of whatever fits.

i thought about sticking the lever locking schrader adapter off a pump on the tank then i could easily fill through cored shcrader.

[SpudFarm]

@ Larda,
And what would one pay for such a beauty hmm?

from MY memory it was about $900 or $250...

pretty sure it was the 900 one.

i also think that it is the kind of gauge that does 5000 readings per second