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Unformatted text preview: rsally as an inductive proximity sensor. On the other
hand, capacitive proximity sensors are sensitive to the effects of humidity in the
active zone. Many manufacturers, for instance, use an auxiliary electrode to reduce
the effects of moisture, dew or ice thus compensating these disturbances. 5.3.1 Considerations for application
• For cost reasons, the use of inductive as opposed to capacitive proximity sensors
is generally preferred to detect metallic objects.
• For the detection of non-metallic objects, optical proximity sensors compete as a
• There is a particular field of application where the use of capacitive sensors
provides a distinct advantage. 5.4
Examples of application Capacitive proximity sensors for instance are suitable for monitoring filling levels of
storage containers. Other areas of application include the detection of non-metallic
materials. Detection of matt,
black objects These objects can be made of rubber, leather, plastic and other materials, which are
not detected by diffuse optical sensors and where ultrasonic proximity s...
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- Spring '12