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In a message dated 97-04-22 19:24:10 EDT, you write: << My feeling is that it is some kind of small orifice. I have no clue as to what is the proper diameter to drill though. Anyone knows the pinhole size to get about 2 l/min? >> I did some extrapolating from the orifice tables I had available and came up with about .001 to .002 inches - awfully tiny, and easy to plug up. I tried the only small orifice I had handy, one from a propane torch, and it flowed way too much at nominal 125 psi intermediate pressure. So, I dug through the junk box and came up with a tiny air regulator rated for up to 300 psi in, adjustable out. Put a BC inflator fitting on the input side, put the torch orifice and a hose barb on the output, and tweaked the output pressure until I got 2 lpm out of it, then removed the adjusting knob. It's about ten times the size and weight of a DiveRite unit, but the price was right. Total cost: $0.00, since it all came out of the junk box. If you had to buy a reg, you'd be just as well off to buy one of the commercial flowmeters/flow restrictors. As I understand it, the Diverite unit uses a piece of sintered metal similar to a first stage scuba reg filter, only finer (see page 59 in Vance Harlow's _Oxygen Hacker's Companion_). I'm looking for some to experiment with - any suggested sources? Dan ========================================================= Daniel R. Fountain [Lake Superior] dfountain@ao*.co* CIS 76545,1467 "I try to learn from the mistakes of others, since I can't live long enough to make them all myself." ========================================================= -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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