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Thanks Vance & Phil, nothing like
experience.
On the subject of altimeters; I'm currently getting
two circuits with altimeters
in them made up by a "home made rocket" specialist
in the States.
They are for triggering a solenoid valve
to top up the O2, & replace the bellows &
regulator
in the bellows add system. About 3"x 2" x 1" with
an LED display. Cost $80- each.
I may run both simultaneously or just keep one as a
spare.
Alan
----- Original Message -----
Sent: Thursday, December 30, 2010 7:57
AM
Subject: Re: [PSUBS-MAILIST]
Barometers
Psubbers:
Save yourself a lot of packaging headaches: Go to
a recreational aircraft store (usually around airports) and buy a skydivers
altimeter - rugged,nicely housed, and 'cheap like borscht'! Covers the range
you need and in readable increments.
As Vance and Cartsten and others have said - if
the pressure rises after 'hatch-latched', thats bad news and you need to find
out why.
Don't panic when the pressure drops, tho' .
. .it's usually just temperature change as you descend into the gloom
!
Phil
----- Original Message -----
Sent: Wednesday, December 29, 2010 9:34
AM
Subject: Re: [PSUBS-MAILIST]
Barometers
Barometers are useful for your life support. An inch of mercury
equals about 1/2 psi. When the pressure is up an inch, run the scrubber
until your pressure is down an inch. You maintain a maximum differential of
1 psi and it works a treat, and it's cheap.
If you have a gas leak in the boat, my friends, you need to be on the
trailer or in the shop fixing it. This is no question here. No gas leaks.
That is why buying and using the best valves, Swagelok connectors or
equivalent and SS tubing is so important. Once set, it holds. That makes it
worth the price. Leave the air conditioning connectors to the air
conditioning folks.
If something untoward happens, get out of the water and go after the
leak with Snoop. Also, carry a Snoop squeeze bottle in your tool kit. Any
questions, start checking on the spot. All in all, unless you've got big
volume like the Euronaut, get back to the surface.
Vance
-----Original
Message----- From: Alan James <alanjames@xtra.co.nz> To:
personal_submersibles <personal_submersibles@psubs.org> Sent: Wed,
Dec 29, 2010 6:40 am Subject: Re: [PSUBS-MAILIST] Barometers
Carsten,
was that your experience with SGT Peppers?
I am also making a small sub & Having a small internal volume
it would be more likely to have larger variations in pressure.
Alan
----- Original Message -----
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Thursday, December 30, 2010 5:17 AM
Subject: Re: [PSUBS-MAILIST] Barometers
A standard barometer is just fine.
Read it during closing the hatch - and adjust the "stay" arrow to the number.
Means bring both indicators to the same figure.
If during the dive the barometer indicator increase this means you have a gas
leak in your sub..
To much oxygen flow or a leak in the compress air system.
vbr carsten
"Alan James" <alanjames@xtra.co.nz> schrieb:
> Hi,
> I've just started looking at barometers.
> The standard range for a barometer seems to be round 960 - 1060 milli bars.
> This is a range of 1.47 psi. This seems small considering pressure changes
> due to cold or hot conditions & fluctuations due to O2 consumption & response
times of the life support
> system to adjust for this. Can anyone comment on wether a standard barometer
stays within it's scale,
> or wether I'd be better off buying something electronic with a wider range.
> Regards Alan
>
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