On 9/20/2011 8:50 AM, ---MIKE--- wrote:
A few years ago I built an elaborate sensing system for my septic pump.
It uses a current sensing circuit that activates a solid state relay.
The relay operates a timer and a chime type doorbell that chimes three
times when the pump is operating. This normally happens two times a
day.

---MIKE---

In the White Mountains of New Hampshire
(44� 15' N - Elevation 1580')


There are various commercial tank alarms that can also that can be
purchased. At least in the nearby areas to here (we have central sewers)
they are either part of a standard install or maybe a code requirement.