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. 908-7129
Mfr. Part No.OPB750T
BrandOptek
TWD161.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 729-5117
BrandRS PRO
TWD2,632.00
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - - - 30V - LED IP67 100 mA -
RS Stock No. 170-0724
Mfr. Part No.OPB704W-Z
BrandOptek
TWD132.30
Each (In a Bag of 100)
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - - - Infrared - - -
RS Stock No. 714-1666
Mfr. Part No.M100/MV100-RT/76a/103/115
TWD4,140.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m PNP Cable - - - 30V - LED IP67 100 mA -
RS Stock No. 909-2881
Mfr. Part No.Q4XTBLAF300-Q8
BrandBanner
TWD14,734.00
Each
units
Barrel Diffuse 25 → 300 mm Bipolar NPN/PNP M12 Connector - - - 30V M12 Laser Light IP67, IP68, IP69K - -
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
TWD1,180.00
Each
units
Block Retroreflective 1 → 5 mm NPN - - - - 24V - Infrared IP50 100 mA -
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
TWD5,765.00
Each
units
Barrel Retroreflective 3.2 m PNP 4-Pin M12 Connector - - - 30V - LED IP67 200 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. 403-963
Mfr. Part No.GLV18-6-S/59/102/115
TWD2,230.00
Each
units
Barrel Retroreflective 5.5 m NPN Cable - - - 30V - LED IP67 100 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. 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. 425-8411
Mfr. Part No.OJ5036
TWD7,516.00
Each
units
Block Retroreflective 8 m PNP M8 Connector - - - 30V - LED IP67 200 mA -
RS Stock No. 909-2869
Mfr. Part No.Q3XTBLD-Q8
BrandBanner
TWD8,649.00
Each
units
Barrel Diffuse 0 → 300 mm Bipolar NPN/PNP M12 Connector - - - 30V M12 Laser Light IP67, IP68, IP69K 28 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. 125-4551
Mfr. Part No.PM-F45
BrandPanasonic
TWD705.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 1m Cable - - - 24V Cable Infrared IP64 50 mA -
RS Stock No. 818-1722
Mfr. Part No.EE-SX670-WR 1M
BrandOmron
TWD1,239.00
Each
units
Fork Through Beam (Fork) 5 mm NPN - - - - 24V Pre-Wired Infrared IP50 35 mA -
RS Stock No. 902-7186
Mfr. Part No.BOS 21M-PA-PK10-S4
BrandBALLUFF
TWD8,800.00
Each
units
Block Retroreflective 0 → 4 m PNP M12 Connector - - - 30V Connector LED IP67 100 mA -
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
TWD5,690.00
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw - 250V - 5V - LED IP66 3 A -
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
TWD784.00
Each
units
Fork Through Beam (Fork) 5 mm PNP 4-Pin Connector - - - 24V Connector Infrared IP50 12 mA -
RS Stock No. 125-4533
Mfr. Part No.PM-R25-C3
BrandPanasonic
TWD927.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 3m Cable - - - 24V Cable Infrared IP64 50 mA -