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Re: [PSUBS-MAILIST] gauge questions
I plan to do all digital gauges, partially since that is what I know. Texas Instruments
has a great eval kit for their msp430F149 micro controller that comes with books describing
a lot of digital measuring application info. With this CPU and an Optrex display you can
easily measure and display temp, humidity, pressure, voltages, currents, time, etc. It is easy,
cheap, can be run on a coin-cell for years (will run on a potatoe for a long time!), and is as
reliable as mechanical gauges (don't have to run that stainless line everywhere either!). by the
way, anyone know where to find good solid-state DC to 3phase converters?
Warren.
----- Original Message -----
From: "Dan H." <JMachine@adelphia.net>
Date: Fri, 3 Jan 2003 20:02:41 -0500
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] gauge questions
> Alec,
>
> I was just making something for my depth gauge that may be of interest to
> you.
>
> I have my depth gauges piped in with stainless tubing from the upper part of
> my sub. The line comes thought the hull up high, through an emergency
> shutoff, then down through a T, through two primary shut offs and then to
> the gauges. I have two gauges. One is low pressure for accurate depth
> readings when diving shallow and one of higher pressure for deeper dives.
> Each gauge can be shut off independently.
>
> I live in a northern climate and was concerned with water being trapped in
> the lines and freezing. Instead of letting water get into the gauges, I've
> decided to build a stainless housing that has a three inch rubber diaphragm
> on it. This diaphragm assembly screws on the outside of the through hull
> that is connected to my gauges. My diaphragm has one side totally exposed
> to the water. I'll completely fill the gauges and lines with oil. The
> housing with the diaphragm, located on the outside of the hull, will also be
> totally filled with oil.
>
> When the sea water presses against the diaphragm, the diaphragm will put
> pressure on the oil and be sensed on the gauge inside the hull. But water
> will never enter the system. It's built but I haven't tried it yet. Hope
> you can follow my description. Water presses on the diaphragm, the other
> side of the diaphragm presses on the oil, and the oil pressure works the
> gauges.
>
>
> Just starting my wiring. Nothing seems to fit where I would like to have
> it!!!!! BIG wires in small spaces!
>
> Dan H.
> ----- Original Message -----
> From: "Alec Smyth" <Asmyth@changepoint.com>
> To: "PSUBS (E-mail)" <personal_submersibles@psubs.org>
> Sent: Friday, January 03, 2003 2:32 PM
> Subject: [PSUBS-MAILIST] gauge questions
>
>
> > Hi all,
> >
> > I'm getting close to finishing my electrical distribution and controls
> panel, and the next one is a panel for pressure instruments, so I'm starting
> to research gauges. Someone on the list must have done this before me, so I
> thought I'd ask. Does anyone have any good sources or other recommendations?
> For example, any advantage going with liquid filled or dry? I'm looking at
> gauges for:
> >
> > 1) O2 HP - I see most gauges in my catalogs say "not for oxygen use".
> > 2) O2 regulated pressure - ditto.
> > 3) Air HP - no problem.
> > 4) Air regulated - no problem.
> > 5) Depth - the problem is my design prevents me from just mounting a
> scuba pressure gauge outside the window, I need a panel instrument on the
> inside. Is it OK to pipe a pressure gauge to the outside with nothing but
> stainless tubing and a shutoff valve, or would you use some kind of
> strainer? Is a stainless bourdon really necessary, or brass or copper OK?
> Does anyone know of an industrial gauge supplier offering faces in fsw?
> > 6) Altimeter - ebay?
> >
> > Any pearls of wisdom are much appreciated. Sorry for so many questions on
> something so simple!
> >
> > thanks,
> >
> > Alec
> >
>
>
--
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