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.
Thermal dispersion switches of gas and liquid flow, liquid level and interface
details
Level switches for conductive media, designed to operate in tough industrial environments
details
Vibrating level switches for dry bulk materials
details
Side mounted switches for high or low alarm duties
details