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This consists of two devices, a light emitter and a light receiver. The light receiver device contains amplifier circuit which gives transistorised output. These two devices are kept apart facing each other. The transmitter sends pulses of light in the infra red range which are invisible to the human eye. The receiver device opposite to the transmitter receives these rays. On interruption of these rays by the target object, receiver gives a signal which is amplified and fed to output transistor.
– Large sensing distance is possible as emitter and receiver are kept opposite to each other.
– Suitable for precise detection of large as well as small objects. Repeatability and indexing precision are not
impaired even if the object surface or background is reflecting.
– Can be coupled directly to PLC.
Example :