capacitive level switch / for liquids

The Kotron? Model 811 Level Switch offers the user great flexibility. The switch can be used either as a single alarm relay with narrow differential or for control purposes with an adjustable differential. Using the proven RF Capacitance technology, the Model 811 provides reliable operation for a broad range of applications.

Operating Principle

The amount of capacitance developed in any vessel is determined by the size (surface area) of the probe, the distance from the probe to its ground, and the dielectric of the medium being measured. Considering that the probe?s mounting position is fixed, and that the dielectric value of the medium is constant, then the amount of capacitance developed in any vessel becomes dependent upon the amount of the probe which is covered by the media.

As media rises and falls in the tank, the amount of capacitance developed between the sensing probe and the ground also rises and falls. This change in capacitance is measured in the electronics. When the capacitance measurement is the same as the setpoint, an alarm occurs.