Precision Level Gauge

Precision instruments for measuring temperature, altitude and light intensity have all appeared in Elektor Electronics, but those of us who utilise rainwater have up to now looked in vain for a precision level gauge for our opaque rainwater tanks. All level gauge designs that have been previously published work on the basis of conductivity, which is not suitable for rainwater with its wide range of pH values. In addition, acidic rainwater converts the copper of the electrodes into green, water-soluble and poisonous copper salts. Here we present a continuously operating, accurate level gauge for rainwater tanks (and other types of containers) that brings an end to this situation.