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Unformatted text preview: nder nozzle hits the receiver thus creating
a signal. With an air barrier a signal is created only if an object is not present.
A major advantage of this solution (as opposed to an optical proximity sensor for
instance) is in that contamination such as drilling fluid does not interfere with
operation. 130 © Festo Didactic GmbH & Co. KG • FP 1110 8. Pneumatic proximity sensors 20 mm mm
381 Fig. 8.7.2: Use of an air barrier for counting plastic sheets Clear plastic sheets pass on a transport device in gaps of 20 mm.
The gaps between the sheets are used for the purpose of counting.
A pressure amplifier is fitted downstream of the air barrier receiver. Key data • Supply pressure of sender 25 kPa (0.25 bar)
• Response time 16 ms
• Maximum speed of transport device 37 m/min.
The use of optical or capacitive proximity sensors would present problems in this
instance; ultrasonic proximity sensors would be a possible alternative. © Festo Didactic GmbH & Co. KG • FP 1110 131 8. Pneumatic proximity sensors p = 10 to 30 kPa 1 3 1
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- Spring '12