From what I remember Phil’s DW had a gauge that at 2 psi suction went clockwise. I think that he may do the same?? When I came up with the idea I thought “I think I have seen this somewhere before” Til then I was playing around with DP gauges and all sorts of complications. Also I did not want to go for an option of a used gauge such as an altimeter. However that is a great option. Hugh From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland Hi All, Thanks for the tips in this thread. I like Hughs idea of reversing the gauge and using the small reference bottle. I think this idea has just saved my "sewage cart" gauge. I'll just use it like this and it will just read in reverse. Its already zero'd in the middle. Lots of options now.
Kind Regards James On 28 March 2012 02:50, Smyth, Alec <Alec.Smyth@compuware.com> wrote: Hi Jim, You are recalling a thread in which I tested Snoopy’s life support on land with the help of Jon’s O2/Co2/cabin pressure meter. My life support is elementary but I found the pressure to be surprisingly stable – so much so that I didn’t need to adjust the flow once in a test that I think ran about half an hour. I’m sure in the archives there are good posts by Cliff Redus, who has taken a PLC based approach that adds O2 based on cabin pressure sensing. And then of course there’s Phil’s invaluable life support paper on the website. That’s a must read. Thanks,
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of JimToddPsub@aol.com
Very good point, Alec. If you didn't have an overpressure valve, at least the altimeter would let you know you were about to get your butt kicked when you got to the surface! I had thought that once I closed the hatch, pulled -2.5 psi (+5,000 feet on the altimeter), and verified no leakage, I would then bleed the air back in s-l-o-w-l-y, close all valves in order to return to 1atm, and dive. However I'm now wondering if it would be better to retain slight negative pressure (maybe one lb) for submerging. Would that complicate any of the equipment such as the O2 system? What are the thoughts of all you experienced guys? What have I not considered? Thanks, Jim In a message dated 3/27/2012 3:43:19 P.M. Central Daylight Time, Alec.Smyth@compuware.com writes:
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