Jim Weir wrote:

I think the chips themselves are worth investigating. I do have a prejudice
against UK semiconductor manufacturers, having had a major one and a minor one
simply stop producing parts that rendered several tens of thousands of dollars
of hardware and engineering time down the drain.

I realize that they are not ALL like that, but the only two that have screwed me
thus far in 40 years have been UK based.

Jim

-If you want to do some tinkering of your own (legal disclaimer here..) you
-may want to look at sensor chips from QProx (www.qprox.com). They have a
-couple of capacitive level monitor chips like the QT300/301 or QT117L that
-may provide real-time non-contact level information. If you have a non-metal
-tank you may be able to just attach two strips on the side of the tank and
-be done.
-
-Jim, what do you think?
-
-Rob
-

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

I've used the QT114 for a single point fluid (alcohol) level control in
a one liter plactic cylinder. Precise within fractions of a mm. I also
used the QT110 for an isolated (behind a glass display window) proximity
switch for one of our students' Physics class projects. The QT117 or
QT300 might work for a tank level gauge. They even have "slosh" filter
software built in,