Josh,

Look hard at ultrasonic level sensors that mount in the top of the tank.
Pricey but possibly worth it.

Also, I seem to recall some sensors that mount on the outside of plastic
tanks.  Maybe 3-4 per tank.  They are contactless.  That is, they don't
make contact with the liquid so they are not susceptible to scale build up,
etc.  A Hunter I work on occasionally has some.  They seem to work OK.

Sorry I don't have any vendors or references for you.

Dennis C.
Touche' 35-1 #83
Mandeville, LA


On Fri, Feb 7, 2014 at 5:34 PM, Josh Muckley <muckl...@gmail.com> wrote:

> Anybody have any thoughts on holding tank and freshwater tank level
> indicators?  I'd like to see about possibly getting the original control
> panel and indicators working.  It looks like 4 wires.  Maybe 1 wire for V+
> and the other 3 for level referance (1/4, 1/2, 3/4).  They seem to just
> make continuity through the water.
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
>
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