On Aug 20, 7:43*pm, SF Man wrote:
On Fri, 19 Aug 2011 08:17:46 -0500, G. Morgan wrote:
Here is how pro's do it:
http://www.winland.com/waterbugalert.html

Interesting.

The Waterbug WB200 or WB350 seems to fit the bill, on initial inspection.

I don't see how they fit the bill at all. They are alarms that
trigger
when a sensor gets wet. You can hook like 6 sensors up to them,
but they will just sound an alarm when it reaches any one of them.
They are intended for applications like putting several sensors
around your basement floor, so that if any one of them gets wet
the alarm sounds.

Another big problem. Those sensors are intended for areas
that are dry and rarely get wet. The inside of a tank is going
to be wet with condensation, etc and even if you had 6 of
them in there, they would probably all be wet enough to
trigger the alarm.



Since a well holding tank has got to be wet inside, key to operation is the
sentence "Will not alarm due to condensation or humidity".

I wouldn;t count on taking it to the extreme of the inside of
the tank. I would take it to mean the condensation or humidity
you would find on a basement floor or a laundry room.




Seems to me, I screw the six sensors onto a weighted panel (or pipe) the
depth of the holdin tank ... and then just lower that pipe into the tank
and secure somehow.

And if one sensor is wet, it triggers an output or sounds the
internal alarm. All that tells you is that at least one sensor
is wet, not which one.





The specs note that the wires can be 100 feet long, so that should be fine
if I strategically place the main unit.

One intriguing sentence (on the Waterbug WB200) was "Can be used to detect
ABSENSE of water (emphasis mine).

Seems to me, the absense of water is more interesting, to me, than the
presence of water ... so I would think that WB200 unit would be the first
to explore!