Carlo Gavazzi Capacitive level detectors. 3-wire DC sensors with open collector NPN or PNP transistor output. The sensors are available in a 5 VDC version and a 10-30 VDC version. The sensing distance is fixed and works through a non-metallic wall of up to 20 mm of thickness.
General Characteristics
Basic capacitive water level sensor
For water storage tanks in mini-pools and whirlpools
Detection of excess water in the whirlpool tub
Safety device to control the operation of the pump
Mounting by screws or glued on the outside of any non-metallic tank