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
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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- Spring '12
- pH, proximity sensors, Festo Didactic GmbH, Festo Didactic GmbH & Co