I have Water
switch that is normally in the yacht bilge
where it encounters contaminated or salt water
The past weekend we had torrential rain, and since I am in the process of repairing cockpit
drains, I relocated the Water
Witch to the cockpit
to clear out rain water. It failed to switch.
I took it home for some simple tests.
For those unfamiliar with this switch – no moving parts
; two exposed metal contacts; presumably it monitors the resistance between the contacts; when both are immersed in water the resistance changes and the switch triggers. It has anti-stutter circuitry. This is a nice and compact, fully sealed unit.
In my rudimentary testing, it would not switch reliably with fresh water, irrespective of battery
level. It would switch reliably when a teaspoon of sugar or mud is added to the water.
It is not designed to switch when immersed in oil
I have returned it to the retail supplier asking for an in-warranty response, which I have not yet received.
If anyone has had contrary experiences with this product please let me know – then I may consider giving it another go once I get a replacement. But I am now leaning towards scepticism.