(주)모스텍유니버스

A static-capacitance type level sensor is composed of electrodes (a ground electrode and detection electrode) and electronic circuits, with the electrodes constituting a capacitor. With the ground electrode contacting a tank, a capacitor including the tank is formed.

Conditions such as shape, dimensions, layout, and peripheral situations determine the capacitance of the capacitor. If conditions other than the specific permittivity (*1) of the measured objects are the same, the capacitance of the capacitor depends on the specific permittivity of the measured objects. If we take the capacitance for air as a reference, we can distinguish the difference in capacitance created by measured objects with different values of specific permittivity.

In addition, by taking either one of the two measured objects with different specific permittivity as a reference, we can distinguish the two objects. This product detects the static capacitance of measured objects and outputs signals.

*1 Specific permittivity is the ratio of the static capacitance of a capacitor where an insulating substance (dielectric) fills the space between its electrodes to the capacitance of the capacitor where a vacuum exists between its electrodes with the dielectric removed. Specific permittivity is a constant depending on the types of materials.