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Objects to be detected by a capacitive proximity

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Unformatted text preview: cted according to the material which they are to detect. Metals of any kind can be detected easily and economically with inductive proximity sensors if short switching distances only are required (e.g. 0.4 – 10 mm). For greater distances, optical proximity sensors of varying designs are available. The greatest distances can be spanned by means of through-beam sensors. Capacitive proximity sensors are suitable for the detection of a wide range of materials, but again only for relatively small distances, similar to inductive proximity sensors. Objects to be detected by a capacitive proximity sensor must be of a certain minimum volume. Ultrasonic and optical diffuse reflective proximity sensors are able to detect a wide range of different materials over greater distances. However, the detection of reflecting objects with tilted surfaces may create problems. Further criteria for the selection of proximity sensors are the conditions under which the object is to be detected, what the installation requirements for the...
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