The RF capacitance point level sensors are versatile devices providing high and low level readings in bins, silos, tanks, hoppers, and other vessels.  This sensor’s superior sensitivity range allows users to properly adjust units to meet the needs of a wide variety of applications.

A radio frequency is applied to the probe and is continually analyzed to determine the influence caused by the surrounding environment. As material contacts the probe, the radio frequency shifts indicating an increase in capacitance.  The active probe of the unit and the vessel’s wall make up the two plates of a capacitor which are separated by a fixed distance.  The probe’s insulator and surrounding air provide the dielectric material.  As the air is displaced with any other material, the capacitance effect is enhanced, thereby changing the application’s impedance.  This influence is measured within the circuitry and compared to a reference established by the sensitivity setting.  The setting determines how much influence must be present before the output changes.