Since the area of the electrode and the tank wall is constant, the only variable is the material inside the tank acting as the dielectric. If the level of this dielectric material changes, the current through the plates also changes in proportion to the level. A dielectric is defined as an insulating material that excludes many liquids, such as water.

While the dielectric constant of air and vacuum is 1, it is bigger than 1 for other substances. In that case, the capacity also changes with the change in the amount of substance in the tank. To obtain a useful measurement result, the dipstick immersed in the liquid at varying depths must be completely insulated. After setting the measuring degree, the level can be read from a display unit.

Applications
Steam boilers, liquid tanks, fuel tanks, concentrate tanks, marine applications, glycol tanks, food machinery, cooling liquid tanks, ships, brine tanks, wine tanks, clean water tanks, oil tanks, CO2 liquid tanks, high temperature tanks, low conductivity liquids, hot sticky and high viscosity acid and chemical liquids etc.

Advantages
• Easy to calibrate & install.
• Calibration possibility for lower and upper point.
• High accuracy.
• Operates at high temperature and high pressure.
• 50-4000pF measuring range