Posted: Fri Feb 04, 2011 6:40 am
does anybody understand a little bit german here? 
Only if Till Lindemann is shouting itspud-freak wrote:does anybody understand a little bit german here?
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Posted: Fri Feb 04, 2011 6:58 am
Posted: Fri Feb 04, 2011 9:17 am
In fact, I do yes^^does anybody understand a little bit german here? Smile
Posted: Fri Feb 04, 2011 9:55 am
Jörgs does
Posted: Fri Feb 04, 2011 9:59 am
The problem with metering with a pressure gauge is the simple fact that screw on clean out caps don't reliably seal. If it leaks some, your mix will be way off. A volumetric meter can tolerate some chamber leakage and still be very close to the proper mix.
Posted: Fri Feb 04, 2011 12:54 pm
oukey i've testet it, but i can't so little set the propane-butane gas
because i don't have a little gauge for this mini pressures..
tomorrow i want to build a hybrid gun with steel pipes!
a 1x mix i not so efficiently, whitch mix do you need?
because i don't have a little gauge for this mini pressures..
tomorrow i want to build a hybrid gun with steel pipes!
a 1x mix i not so efficiently, whitch mix do you need?
Posted: Fri Feb 04, 2011 4:01 pm
To find a very low pressure gauge, you want something used to monitor the pressure on air filters and such on commercial HVAC systems. Warning, they are not cheap.
I would recommend something from this page, but they are too sensitive for your application as many only measure up to 2 inch or 4 inch. You need one in the 20 inch WC range. You are looking to measure pressure in the 16 inch Water column range.
http://www.terrauniversal.com/measuring ... gauges.php
This one will work, but you will not like the price.
http://www.grainger.com/Grainger/MIDWES ... sure-3GVH6
I would recommend something from this page, but they are too sensitive for your application as many only measure up to 2 inch or 4 inch. You need one in the 20 inch WC range. You are looking to measure pressure in the 16 inch Water column range.
http://www.terrauniversal.com/measuring ... gauges.php
This one will work, but you will not like the price.
http://www.grainger.com/Grainger/MIDWES ... sure-3GVH6
Posted: Fri Feb 04, 2011 5:09 pm
No it wont those are designed to be mounted in a wall to measure pressure diferentilal between the two sides, th only way it would work would be to have a large flat area on the cannon to mount/seal it to.
This is a paint booth with a similar gauge installed to measure pressure in the booth.
This is a paint booth with a similar gauge installed to measure pressure in the booth.
Posted: Fri Feb 04, 2011 5:33 pm
That works great if you have a sealed chamber and can measure minuscule amounts of pressure, which most of us can't. Can you reliably measure 0.654psi?cfb_rolley wrote:So, how come metering a mix by measuring chamber pressure rise isn't commonly suggested? To me, that seems like the most simple method of metering, because all you'd need is a sealed chamber, a propane bottle connected to the chamber and a pressure gauge?
If I were you, I'd go with JSR's suggestion and try syringe fueling. If you have a >351mL syringe, that is...
Posted: Fri Feb 04, 2011 5:49 pm
18.1 inches of water
Posted: Fri Feb 04, 2011 6:32 pm
I know that wasn't an answer to my question, but that leaves me horribly confused. Don't you need a given diameter for the cylinder?metalmeltr wrote:18.1 inches of water
Posted: Fri Feb 04, 2011 6:35 pm
Inches of water is the height the pressure will push water up a tube. Diameter doesn't matter.
Posted: Fri Feb 04, 2011 6:44 pm
presure per a given area ia pressure per a given area
psi
lbs per square inch
The basis of pascals principle.
psi
lbs per square inch
The basis of pascals principle.
Posted: Fri Feb 04, 2011 7:37 pm
Oh duh wow. I'm amazed I possibly missed that. I thought the question sounded stupid when I posted it...
So I does the height of the column of water doesn't matter too?
So I does the height of the column of water doesn't matter too?
Posted: Fri Feb 04, 2011 8:05 pm
I dont think so, but it may, I THINK it is just is the diference in height