water conductivity circuit

[donW]

I need to interface two rods in swimming pool water to a microprocessor, to measure CONDUCTIVITY. does not need to be very accurate, but usable over the range 500 to 5000 u semiens.
It must of course use AC on the rods.
Anyone done a circuit for this??

 

[rev2001]

Try using a water sencor that is sold bt some alarm companies for monitoring the over flow conditiond of a sump pump. You can use the output of this device to interface with your microprocessor.
Hope this helps.