Capacitive proximity sensor
max. 15 mm
ifm electronic
The capacitance between the active electrode of the sensor and the electrical earth potential is measured. An approaching object influences the electrical alternating field between these two ”capacitor plates”. This applies to metallic and non-metallic objects. In principle, capacitive sensors work with an RC oscillator. A very small change in capacitance is enough to influence the oscillation amplitude. The evaluation electronics converts this into a switched signal. The sensitivity can be set with a potentiometer.
