Re: CO2 regulator

> From: Stephen.Pushak at saudan_HAC.COM
> While visiting the hydroponics store I also noticed some used
> CO2 style regulators. There were two gauges; one calibrated
> in PSI (presume tank side) and the other in CFH. 

	If this is a true regulator, it controls the _pressure_
on the downstream side.  The gauge is calibrated in CFH because
there is an orifice downstream of it, which will control the flow
at the specified rate _provided there is no further restriction
downstream._  The gauge itself measures _presssure_, as does the
one on the tank side.  Mine is like this, and a working one is
definitely a good buy at $40 (CDN).

> Presumably one
> would still require a fine control needle valve to get
> precise regulation. Is this thing worth the money?
	Yes, you would need a needle valve downstream of it.  Get
a good one, and attach it to the regulator directly.  Remove any
low-grade one already on the regulator.

Paul Sears    Ottawa, Canada