A low voltage AC signal is applied between the probe electrode and the tank wall or reference electrode in the case of a non-metallic tank. When the liquid comes into contact with the electrode tip, a conductive path is established between the sense electrode and the metallic tank wall/reference electrode. Current flow due to the conductive path is sensed, amplified and used to switch a relay for indication or control purposes.
Side mounted switches for high or low alarm dutiesdetails
Level switches for conductive media, designed to operate in tough industrial environmentsdetails
Vibrating level switches for dry bulk materialsdetails
Thermal dispersion switches of gas and liquid flow, liquid level and interfacedetails
PL 87-805 Wloclawek