Electronet series LCT-01 are Capacitance Type Level Transmitters. Vessel wall and probe forms two electrodes. If vessel is of non conductive material, the probe will be double rod type.
The distance between electrode and surface area of electrodes remain unchanged. The variable is the depth of the material being measured which represents the dielectric constant between two electrodes. Air and vacuum have relative dielectric constant as 1 and that of liquids, it is greater than 1.
The capacitance of the capacitor therefore depends on how much material lies between the probe and vessel wall i.e. whether the probe is covered with or free from material. The capacitor changes with change in level of the material and provides corresponding 4-20 mA DC continuous output.
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