Level Detector (simple principle)

The principle of Level detection for this model is simple : When the tank is full, the float is in high level, then we have no contact between the "contact disc" and the metallic part of the connector, so we have an open circuit. On the contrary, if the tank is empty, the float is in low level, then we have contact and the circuit is closed! Also, this model is very easy to assemble and to put in the tank!