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 which provide reliable detection, these are through-beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects or measure the distance to the object.

Through-beam Sensors

Through-beam sensors (aka thru-beam) 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 photoelectric sensors (retroreflective) 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 reflecting materials is different from the reflector.

Diffuse Sensors

Diffuse sensors (proximity sensor) are 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.

A special type of diffused mode is background suppression which enables the user to precisely control the sensing range. A diffuse mode sensor with background suppression is less sensitive to the target colour. They can also use a visible red light or infrared light sources.


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RS Stock No. 2509665675
Mfr. Part No.SM312CV
TWD4,589.00
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RS Stock No. 2509667435
Mfr. Part No.VS3AN5XLP
TWD4,494.00
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RS Stock No. 2509667132
Mfr. Part No.T18SN6RQ
TWD3,108.00
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RS Stock No. 2509665293
Mfr. Part No.SM2A912LVAGQD
TWD7,496.00
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RS Stock No. 2550074522
Mfr. Part No.T30SN6FF200Q
TWD4,207.00
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RS Stock No. 2509667643
Mfr. Part No.EM-T-7A
TWD5,641.00
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RS Stock No. 2509664802
Mfr. Part No.MBC-4
TWD1,195.00
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Mfr. Part No.MPS32HD
TWD4,430.00
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RS Stock No. 2509666656
Mfr. Part No.SM312LP
TWD4,589.00
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Mfr. Part No.T186E
TWD2,151.00
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Mfr. Part No.MPG6HD
TWD6,644.00
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Mfr. Part No.SMA31E
TWD3,824.00
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Mfr. Part No.MPL2HD
TWD5,937.00
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Mfr. Part No.RLK28-55/31/116
TWD6,597.00
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RS Stock No. 2509665574
Mfr. Part No.SM2A912LVQD
TWD7,124.00
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RS Stock No. 2509666921
Mfr. Part No.S18SN6LP
TWD3,585.00
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Mfr. Part No.SMU315D
TWD5,450.00
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RS Stock No. 2509667441
Mfr. Part No.VS3RN5XLP
TWD4,494.00
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RS Stock No. 2509202693
Mfr. Part No.MHP-D33Q
TWD6,220.00
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RS Stock No. 2509667047
Mfr. Part No.S18SN6DQ
TWD2,689.00
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