Lew Hodgett wrote:

"Dazed and Confuzed" writes:

What do you do when the boat is unattended if you don't have a level
switch?

Close any open seacocks when leaving the boat for extended periods.

If you can be so sure that there are never going to be any leaks....



And what do you think about an electronic level switch?
snip
What technology?

Capacitance, hydrostatic, and vibration are all possibilities, and all have
a down side.

conductivity.



Vibration would be my choice since it is not affected by conductivity or
lack of it.

Having said that, sloshing around will be a major problem. Level switches
like steady state conditions.

So put your sensor in a small tube open at the top and with small holes at the
bottom. this will be at whatever the bilge level is, but will more or less
isolate the sensor from sloshing.



It's a bigger engineering problem than it's worth IMHO.

You may be right.



Having an automatic pump on an unattended boat can get VERY expensive.

As an example, spring a fuel leak and allow 10-20 gallons to drain into the
bilge, then pump it overboard while the vessel is unattended.

as likely as any other leak.



Need I say more?

HTH



So what is the method of your $500 solution?




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