water/fuel mixture detector
iam happy with your response on my previos comfunsing title(water/oil mixture detector).now,iam making clear that i want to build a circuit which will detect that there is content of water in a tank filled with fuel(petrol or disel).the circuit should be simple and not computer aided also avoid the use of utrasonic.iam suggesting the use of sensors,condactivity of these imiscible liquids,penetration of light on these liquids while taking into consideration of their densities.