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With retro-reflective photoelectric sensors, or reflector photoelectric sensors, the transmitter and receiver are in a single housing, just as with diffuse proximity photoelectric sensors. However, the sensor always looks at a reflector which is placed opposite the sensor. The output of the sensor becomes active as soon as an object moves inbetween the sensor and the reflector. Unlike with normal reflective sensors, polarized retro-reflective photoelectric sensors use special polarized filters so that the receiver accepts only light reflected by the reflector and not by another reflective object, such as the metallic paint of a car. Thus, it is possible to detect translucent and reflective objects as well.

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A retro-reflective photoelectric sensor is a reliable means of detection. With these sensors, the transmitter and receiver are present in the same housing. Would you like to know more about the operation of retro-reflective photoelectric sensors? Read the knowledge base article here “How do photoelectric sensors work?”

QE series

Retro-reflective photoelectric sensors from the QE series of Micro Detectors are equipped with a plastic miniature housing, NO and NC switching outputs and a switching frequency of 1 kHz for fast detections. Furthermore, the sensitivity can be set with a potentiometer on the back of the housing.

QF series

The QF series retro-reflective photoelectric sensors from Micro Detectors, with a stainless steel housing and an IP69K sealing degree, are the most fully equipped photoelectric sensors for use in challenging applications. Furthermore, the sensors are provided with an ECOLAB housing for use in applications with high hygiene requirements, such as those in the food industry.

QM series

The QM series retro-reflective photoelectric sensors from Micro Detectors are high-performance photoelectric sensors equipped with a switching frequency of 2 kHz. This means 2000 detections per second! The sensors can be configured as NO and NC for versatility.

SM8000 series

The SM8000 retro-reflective photoelectric sensors from Telco Sensors are a series of photoelectric sensors with transmitter and receiver in the same housing with an adjustable range up to 3 meters. The stainless steel M18 housing is equipped with a potentiometer for the sensitivity adjustment as well as for setting a PNP-NO or -NC output. In addition, a choice can be made between a 5 meter fixed cable or a 4-pin M12 connector.

SP2000 series

The SP2000 retro-reflective photoelectric sensors from Telco Sensors with transmitter and receiver in the same housing have a range of 45 meters and use the well-known 50 x 50 mm housing. The retro-reflective photoelectric sensor has a relay or digital PNP/NPN switching output (NO+NC) and 12-240 Vac/dc supply voltage as standard. The sensitivity and on/off delay are adjustable via potentiometers.