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How its Work : Inductive & Capacitive Sensors

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How its Work : Inductive & Capacitive Sensors

Inductive & Capacitive
Their operating principle is based on a high frequency oscillator that creates a field in the close surroundings of the sensing surface. The presence of a metallic object (inductive) or any material (capacitive) in the operating area causes a change of the oscillation amplitude. The rise or fall of such oscillation is identified by a threshold circuit that changes the output state of the sensor. The operating distance of the sensor depends on the actuator's shape and size and is strictly linked to the nature of the material (Table 1 & Table 2.). A screw placed on the back of the capacitive sensor allows regulation of the operating distance. This sensitivity regulation is useful in applications, such as detection of full containers and non-detection of empty containers.

Table 1: INDUCTIVE SENSORS
Sensitivity when different metals are present.
Sn = operating distance.

Fe37 (iron)
Stainless steel
Brass- bronze
Aluminum
Copper
 1 x Sn
0.9 x Sn
0.5 x Sn
0.4 x Sn
0.4 x Sn

Table 2: CAPACITIVE SENSORS
Sensitivity when different materials are present.
Sn = operating distance.
Metal
Water
Plastic
Glass
Wood
 1 x Sn
1 x Sn
0.5 x Sn
0.5 x Sn
0.4 x Sn

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