
Tears in Rain
..............
- Dec 12, 2023
- 858
No problem.Oh man, thanks a ton. That really helped.
I feel kind of stupid not looking up pressure regulators on Youtube - that would have been such an obvious thing.
I've done some testing today and have run into a big/stupid problem:
the helium consumption rate is much too high.
If i set the flow-rate to 15l/min, the pressure sinks about 20 bar.
That would be 10 minutes for the whole cylinder (380 liters), which is about right because it's pretty much empty and 8-10 minutes may be what i got out of it.
I got another 10 liter cylinder now, but i don't dare touch it until i know what i do wrong.
My guess is that the flow-meter, which is made for Argon and CO2 doesn't translate to Helium - so the flow-rate i would have to set it to should be much, much lower?
Yeah, those gases are of different weight. So helium is the lightest, then nitrogen, with argon the heaviest gas.
I've come across people talking about converting argon LPM to nitrogen, when using nitrogen with an argon regulator (15lpm on argon flowmeter=~18LPM nitrogen; ).
The conversion table people used was this one:

Helium is lighter again than nitrogen. Going by that conversion table(I could be corrected), 5LPM on an argon regulator gives 15LPM helium; 7LPM on argon regulator gives 21LPM helium.
If your regulator is both argon and CO2, then you should have argon readings.