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.RS Components offer an extensive selection of photoelectric sensors for use various industrial applications. Our high-quality products are supplied from leading brands including Omron, Sick, Pepperl + Fuchs Telemecanique Sensors Baumer, Banner and of course RS PRO.

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 can detect 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 must 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 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.


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Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Switching Mode Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface
RS Stock No. 2508470081
Mfr. Part No.MPR1HD
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RS Stock No. 2508470075
Mfr. Part No.MPP1HD
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RS Stock No. 2509666498
Mfr. Part No.T18SP6LQ
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RS Stock No. 2509202980
Mfr. Part No.MPL6HD
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RS Stock No. 2509666965
Mfr. Part No.S18SN6D
MYR266.34
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RS Stock No. 2508470110
Mfr. Part No.MPS32HD
MYR481.66
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RS Stock No. 2509665489
Mfr. Part No.SM2A312LPQD
MYR587.33
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RS Stock No. 2550074836
Mfr. Part No.T18VP6URQ
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RS Stock No. 2509665574
Mfr. Part No.SM2A912LVQD
MYR774.65
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RS Stock No. 2509665811
Mfr. Part No.LR400
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RS Stock No. 2509667104
Mfr. Part No.T186E
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RS Stock No. 2509665164
Mfr. Part No.OPBA2QD
MYR446.99
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RS Stock No. 2509667429
Mfr. Part No.VS2AN5CV30
MYR395.02
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RS Stock No. 2509664773
Mfr. Part No.LM5R
MYR417.70
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RS Stock No. 2509666820
Mfr. Part No.SMU315CV2
MYR654.92
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RS Stock No. 2509665293
Mfr. Part No.SM2A912LVAGQD
MYR815.14
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RS Stock No. 2509202889
Mfr. Part No.MLV12-8-H-250-RT/65B/1
MYR908.26
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RS Stock No. 2509664925
Mfr. Part No.T18SP6FF50Q
MYR457.41
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RS Stock No. 2508470132
Mfr. Part No.MPT21HD
MYR497.00
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RS Stock No. 2509664874
Mfr. Part No.RLM5
MYR373.18
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