LGM leakage sensor reliably defines conductive liquids and thus is ideal for tracking leak and humidity of materials. First of all the sensor finds the application in technique for buildings and ventilation. By means of integrated output positional organs can be activated or deactivated. Optionally, it is possible to connect an acoustic or optical signal transmitter. The sensitivity is adjusted via a potentiometer during configuration of the switching polarity and an optional signal output via DIP-switch.