> I hate to be propose a non-electronic system but Rochester makes a sender
> unit rated for 48" deep tanks and off-road use.  Not exotic but probably
the
> easiest.
> http://www.rochestergauges.com/Pages/PDFs/8340_8343.pdf
>
> Dave Mumert




Not rugged enough !!! :-)
It only has about a 3 hour lifetime at maximum rated vibration.
How's that going to stand up to use on a real Ocker bush fire truck?


        RM :-)


(Read the vibration specs carefully to see what I mean ...)


>
> ----- Original Message -----
> From: "Chris Loiacono" <chris@MAIL2ASI.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Monday, March 04, 2002 3:07 PM
> Subject: Re: [EE]: Hopefully, someone can answer this one!
>
>
> > In regard to>
> >
> > > The pressure sensor sealing the top of an air filled tube
> > > seems to me to be the easiest and most reliable solution. 15
> > > PSI differential pressure sensor  with one port to the
> > > (filtered) atmosphere would be the sensor to use (maybe more
> > > PSI advisable).
> > >
> > So, a PSIG sensor type will work, which is basically a differential
sensor
> > with the ambient pressure at the second port. Also, it takes a lot of
> > pressure on a gas to increase the pressure by 15 psi. Your sensor range
> > selection  depends upon the height of your tank and the tube diameter.
> >
> > As the level rises in the tank, the air wil be compressed, right....
What
> > happens when the fluid is rapidly pumped out? Well, next consider that
> many
> > positive pressure sensors do not tolerate negative pressure, so if the
> pump
> > is capable of emptying the tank fluid pretty quickly, meaning more
quickly
> > than return air can enter the tank, you will need to provide a tank top
> vent
> > to allow equalizing without delay. Without this your sensor substrate
can
> be
> > damaged by the suction and you will get inaccurate output that would be
> > difficult to diagnose when debugging the final set-up.
> >
> > Chris
> >
> > --
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> >
> >
>
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>

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