[Date Prev][Date Next]
[Chronological]
[Thread]
[Top]
Re: [PSUBS-MAILIST] gauge questions
Hey! I have a kinda crazy question. Has anyone on the list pressure-proofed one of the terrain
mapping "fish finders" for use as sub sonar? I was noticing that some were economical, had good
range, nice LCD displays, and interesting 3D terrain mapping ability. Any ideas on modifying one
of these for a personal sub?
Warren.
> 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
> > >
> >
> >
>
> --
> ______________________________________________
> http://www.linuxmail.org/
> Now with POP3/IMAP access for only US$19.95/yr
>
> Powered by Outblaze
--
______________________________________________
http://www.linuxmail.org/
Now with POP3/IMAP access for only US$19.95/yr
Powered by Outblaze