RE: [APML] Hypering setup- leak or normal ??

["R. Scott Ireland" <ireland@gate.net>]

Hi Gerry,

I have the same setup, except I use the electric, low-vac pump.  I have
quick releases on both the gas cylinder and the electric pump, so that I can
easily take the tank into the field.

I have never had the problem you describe.  I close off the gas cylinder
first - when at +3 psi - and then close off the chamber fill valve.  The
pressure does not change at all during this process.

Is it possible that the O-ring seal is not sealing completely?  It would
only take a tiny piece of grit or dust to affect the seal integrity (I can
attest to this with the flooding of underwater cameras too).

Scott

website:  http://www.rsiphotos.com/
email:  ireland@gate.net

> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Gerry Cichocki
> Sent: Thursday, April 04, 2002 10:49 AM
> To: astro-photo@seds.org
> Subject: [APML] Hypering setup- leak or normal ??
>
>
> Hello group, just recently started hypering with the Lumicon 600 setup.
> On my final pumpout (hand pump)& filling to +3 psi, I first shut
> the gas off
> when the chamber shows +3 then go to the chamber fill valve &
> shut it off.
> However I notice the chamber pressure is dropping before I get
> the chamber
> fill valve shut off. Once shut off the pressure is constant. Is
> this normal
> or do I have a leak? or should I shut the chamber off first at +3psi then
> shut the gas off.
> I have tightened all fittings & the tank hose has the quick
> release coupler
> on it- should I eliminate the quick release?
> When I pull the vacuum to 26" then let the gas flow to 10" & shut gas off
> the chamber pressure remains stable. Thank you in advance, Gerry
>
>
>
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