The capacitive filling level probe NC57 serves to measure tank filling levels in tanks containing fresh water, waste water or faeces. Filling level heights of between 400 and 2000 mm can be measured. The probe can be used for tanks made of metal. The tank wall and special rod form the electrodes of the measuring equipment. A condition for the flawless function of the probe is a special probe mounted in parallel to the tank wall. In the case of installation lengths > 700 mm, the rod must be supported by insulated circlips at intervals of 700 mm respectively. The housing is connected to the signal earth, and an AC voltage signal is applied to the special rod. If dipped into a fluid, this arrangement becomes a capacitor and the fluid acts as a dielectric. The capacity values of this capacitor are proportional to the filling height of the tank. Electronics integrated into the device convert these capacity changes into an analogue output signal (current or voltage).
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