Photoelectric Sensors

Photoelectric sensors detect and measure physical objects or quantities by emitting a field or beam of electromagnetic radiation, an object is detected by measuring alterations in the return signal. There are 3 main types of photoelectric sensors, these are: through beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects, or measure distance to the object.
Through beam Sensors
Through beam sensors rely on two separate housings, one for the transmitter and one for the receiver, with the transmitter providing a continuous beam of light to the receiver. Each time an object passes through the beam this interrupts the signal between the transmitter and receiver, which in turn causes the receiver to send an electrical signal to the output. Through beam sensors are suited to long distance sensing and are capable of detecting almost any object, irrespective of colour or angular motion.
Retro-reflective Sensors
Retro-reflective have both the transmitter and receiver contained within the same housing, but require a reflector opposite to the sensor. The reflector bounces the light beam back to the transmitter until an object breaks the beam. Objects which are highly reflective such as aluminium require sensors with polarising filters. The filter allows the sensor to acknowledge that the reflected light from reflect materials is different to that from the reflector.
Diffuse Sensors
Diffuse sensors easier to install as only one device has to be mounted. This is because the transmitter and receiver are contained within one housing. Diffuse sensors use the reflection from the target object within a predetermined sensing range. The transmitter sends out a continuous beam of light, once this hits the target it is diffused in all directions, a part of this light is reflected back and recognised by the receiver, the receiver then sends an electrical signal to the output.

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Beskrivning Pris Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS-artikelnummer 742-0795
Tillv. art.nrXUVE04M3NSNM8
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Fork Through Beam (Fork) 3 mm NPN 4-Pin M8 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - 50 μs
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Block Retro-Reflective 40 → 1000 mm PNP 4-Pin M12 Connector - 30V Phototransistor - LED IP66, IP67 100 mA - <=2.5 ms
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Block Diffuse 0.1 → 2.5 m Relay 4-Terminal Screw 250V 30V - Screw Infrared LED IP67 3 A - <=20 ms
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Block Distance 0.03 → 2 m PNP-NO/NC M12 Connector - 30V Laser Cable LED IP65, IP67 <75 mA @ 24 V dc IO-Link -
RS-artikelnummer 512-4662
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Compact Diffuse 1 m Relay 5-Wire Cable 2m 240V 240V - - Infrared LED IP65 3 A - <25 ms
RS-artikelnummer 418-5278
Tillv. art.nrBGL 50 A-001-S49
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Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - 30V Phototransistor - LED IP67 200 mA - -
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Fork Through Beam (Fork) 3 mm PNP 4-Pin M8 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - 50 μs
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Block Background Suppression 100 mm NPN & PNP-NC\NO 5-Wire Cable 2m - 24V Laser - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
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Fork Through Beam (Fork) 2 mm NPN & PNP-NC\NO 4-Pin M8 Connector - 30V Phototransistor - Infrared LED IP65 100 mA - 100 μs
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Barrel Diffuse 1 → 200 mm PNP M12 Connector - 36V Phototransistor - Infrared LED IP65 200 mA - -
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Fork Through Beam (Fork) 3 mm NPN & PNP-NC\NO 4-Pin M8 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - 50 μs
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Block Retro-Reflective 2.4 m PNP-NO/NC 4-Pin M8 Connector - 30V Phototransistor - LED IP67 100 mA - <=0.5 ms
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Tillv. art.nrE3Z-LS86
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Block Background Suppression 20 → 200 mm PNP-NO/NC 4-Pin M8 Connector - 26.4V Phototransistor - Red LED IP67 100 mA - 1 ms
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Tillv. art.nrXUK1APANM12
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Compact Retro-Reflective 7 m PNP 4-Pin M12 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - <2 ms
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Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m NPN & PNP-NC\NO 4-Pin M12 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - <2 ms
RS-artikelnummer 530-0939
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Block Diffuse 4 → 150 mm PNP-NO 3-Pin M8 Connector - 30V Phototransistor - LED IP66, IP67 100 mA - <0.5 ms
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Barrel Background Suppression 1 → 140 mm NPN 4-Pin M12 Connector - 30V Phototransistor - LED, Red Light IP67 100 mA - <=0.5 ms
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Block Background Suppression 100 → 600 mm Analogue 5-Pin M12 Connector - 30V Laser, Phototransistor - Laser Light IP65 100 mA - 2.8 ms
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