The electrode relays of the FKE series are used in conjunction with the conductive level switches of the FK01 to FK12 series to measure the level of conductive liquids.
An alternating voltage is applied to an electrode insulated from the vessel. If this electrode is wetted by the medium, a small current flows from the electrode through the medium to the vessel wall (for plastic vessels to a separate ground electrode). This current flow is detected by the electrode relay and output as a switching signal.
Typical applications
for level detection in vessels with conductive liquids
