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. 530-0888
Mfr. Part No.WTB27-3P2441
BrandSick
TWD12,000.00
Each
units
Block Diffuse 30 → 1100 mm PNP 4-Pin M12 Connector - - - 30V - LED IP69K 100 mA -
RS Stock No. 786-5851
Mfr. Part No.WL260-S270
BrandSick
TWD5,300.00
Each
units
Block Retroreflective 0.01 → 15 m Relay 5-Terminal Screw - 240V - 240V - LED IP67 3 A -
RS Stock No. 289-0158
Mfr. Part No.VT18-2T1410
BrandSick
TWD4,900.00
Each
units
Barrel Diffuse 2 → 100 mm Triac 4-Pin M12 Connector - 253V - - - Infrared IP67 300 mA -
RS Stock No. 493-7316
Mfr. Part No.WF2-40B410
BrandSick
TWD6,500.00
Each
units
Fork Through Beam (Fork) 2 mm NPN/PNP 4-Pin M8 Connector - - - 30V - Infrared IP65 100 mA -
RS Stock No. 701-8783
Mfr. Part No.WL4S-3F2130V
BrandSick
TWD6,000.00
Each
units
Block Retroreflective 4 m PNP 3-Pin M8 Connector - - - 30V - LED IP69K 100 mA -
RS Stock No. 763-7889
Mfr. Part No.VTF18-3F1412
BrandSick
TWD3,100.00
Each
units
Barrel, Elbow Background Suppression 3 → 100 mm PNP 3-Wire Cable 2m - - - 30V - Infrared IP67 100 mA -
RS Stock No. 218-923
Mfr. Part No.WT100L-E2241
BrandSick
TWD6,300.00
Each
units
Block Diffuse 450 mm NPN 4-Pin M8 Connector - - - 30V - Laser Light IP65 100 mA -
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
TWD14,500.00
Each
units
Block Background Suppression 50 mm → 3.1 m NPN/PNP 5-Pin M12 Connector - - IO-LINK 30V M12 Connector Laser Light IP65, IP67 - IO-Link
RS Stock No. 786-5927
Mfr. Part No.WT24-2B410
BrandSick
TWD13,400.00
Each
units
Block Background Suppression 100 → 2500 mm NPN/PNP 4-Pin M12 Connector - - - 30V - Infrared IP69K 100 mA -
RS Stock No. 219-011
Mfr. Part No.WL100L-E1131
BrandSick
TWD6,300.00
Each
units
Block Retroreflective 0.08 → 12 m NPN Cable - - - 30V - Laser Light IP65 100 mA -
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,600.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - - 30V - LED IP65, IP67 100 mA -
RS Stock No. 741-7613
Mfr. Part No.VTE18-4P4240V
BrandSick
TWD5,100.00
Each
units
Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - - - 30V - Infrared IP67, IP68, IP69K 100 mA -
RS Stock No. 530-0866
Mfr. Part No.WTB27-3P2411
BrandSick
TWD12,000.00
Each
units
Block Diffuse 30 → 1600 mm PNP 4-Pin M12 Connector - - - 30V - Infrared IP69K 100 mA -
RS Stock No. 842-8510
Mfr. Part No.GTB10-P1212
BrandSick
TWD4,437.00
Each
units
Block Background Suppression 20 → 950 mm PNP Cable - - - 30V - LED IP67 20 mA -
RS Stock No. 134-7784
Mfr. Part No.WLG4SC-3P2232A00
BrandSick
TWD7,100.00
Each
units
Block Retroreflective 0 → 5 m PNP 4-Pin M8 Connector - - IO-LINK 30V 4-Pin Connector LED IP66, IP67 20 mA IO-Link
New
RS Stock No. 210-3964
Mfr. Part No.GTB10-N4211
BrandSick
TWD3,057.00
Each
units
Block Background Suppression 20 → 950 mm NPN Male Connector M12 - - - 30V 4-Pin Red Light IP67 100 mA -
New
RS Stock No. 205-4854
Mfr. Part No.WL4S-3F3132
BrandSick
TWD4,615.00
Each
units
Rectangular Retro Reflective 5 m PNP Cable with connector - - - 30V 3-pin PinPoint LED IP66, IP67 - -
New
RS Stock No. 210-3797
Mfr. Part No.WTV2S-2P3225
BrandSick
TWD4,635.00
Each
units
Block Background Suppression 1 → 36 mm PNP Cable with M8 Male Connector - - - 30V Cable 200 mm, 4-Pin Red Light IP67 500 mA -
New
RS Stock No. 205-4940
Mfr. Part No.WL2S-2E1330
BrandSick
TWD4,363.00
Each
units
Rectangular Retro Reflective 1.2 m NPN Cable - - - 30V 3-pin PinPoint LED IP67 - -
RS Stock No. 184-6318
Mfr. Part No.1084109
BrandSick
TWD7,118.00
Each
units
Block Through Beam 0 → 10 m PNP M8-4 Pin Connector - - - 30V M8 LED IP67 30 mA -