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Unformatted text preview: conjunction with proximity sensors. One cable
transmits the light emitted by the light source, while the other cable conducts the
light to the receiver of the proximity sensor. Diffuse sensors as well as throughbeam sensors can be realized using optical fibre. In order to increase the relatively
short sensing range of diffuse sensors with fibre-optic cables, they may be used in
conjunction with reflectors to form a retro-reflective sensor.
For sensor applications, fibre optic cables include bundles of individual fibres. The
arrangement of the optical fibre in emitter and receiver cables can be done in a wide
variety of manners. The chosen arrangement depends on the individual case of
application. a) b) c) d) e) f) a) arbitrary c) uniform e) semi-circular b) segmented d) concentric f) in-line Fig. 11.4.11: Schematic design forms of fibre-optic cables (Source: Schott) 198 © Festo Didactic GmbH & Co. KG • FP 1110 12. Circuit symbols for proximity sensors 12.1
Circuit symbols to
standard DIN 40900 Circuit symbols Description
Proximity sensor Approach-sensitive device, block symbol
Method of operation to be specified
Approach-sensitive device, capacitive, reacts to approach of a
solid object Contact sensor Table 12.1.1: Circuit symbols for sensors to standard DIN40 900, Part 7 Circuit symbols Description
Contact-sensitive sensor (normally open contact) Proximity-sensitive sensor (normally open contact) Proximity-sensitive sensor (normally open contact), ac...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12