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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Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 818-1548
Mfr. Part No.E3JM-R4M4-US
BrandOmron
TWD6,348.00
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
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 - <=1.5 ms
RS Stock No. 908-7087
Mfr. Part No.OPB700ALZ
BrandOptek
TWD311.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 198-0480
Mfr. Part No.E3SCT61
BrandOmron
TWD11,786.00
Each
units
Block Through Beam (Emitter and Receiver) 30 m PNP Pre-Wired Cable - - 30V - Infrared IP67 100 mA - 1 ms
RS Stock No. 307-913
Mfr. Part No.OPB704
BrandOptek
TWD83.00
Each
units
Block Retroreflective 3.8 mm NPN - - - - Wire Lead Infrared - - - -
RS Stock No. 425-8146
Mfr. Part No.OJ5026
TWD5,208.00
Each
units
Block Retroreflective 2 m PNP M8 Connector - - 30V - LED IP67 200 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 - 20 ms
RS Stock No. 403-963
Mfr. Part No.GLV18-6-S/59/102/115
TWD1,967.00
Each
units
Barrel Retroreflective 5.5 m NPN Cable - - 30V - LED IP67 100 mA - <=1 ms
RS Stock No. 714-1666
Mfr. Part No.M100/MV100-RT/76a/103/115
TWD4,083.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m PNP Cable - - 30V - LED IP67 100 mA - 0.5 ms
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 - 100 μs
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
TWD7,057.00
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 908-7110
Mfr. Part No.OPB745
BrandOptek
TWD97.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
TWD933.00
Each
units
Fork Through Beam (Fork) 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
RS Stock No. 326-7240
Mfr. Part No.E3TSL132M
BrandOmron
TWD2,906.00
Each
units
Block Retroreflective 5 → 15 mm PNP Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 902-7186
Mfr. Part No.BOS 21M-PA-PK10-S4
BrandBALLUFF
TWD8,376.00
Each
units
Block Retroreflective 0 → 4 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 0.5 ms
RS Stock No. 763-7889
Mfr. Part No.VTF18-3F1412
BrandSick
TWD3,826.00
Each
units
Barrel, Elbow Background Suppression 3 → 100 mm PNP 3-Wire Cable 2m - - 30V - Infrared IP67 100 mA - 2 ms
RS Stock No. 729-5117
BrandRS PRO
TWD2,668.00
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 786-5933
Mfr. Part No.WL27-3P2451
BrandSick
TWD6,784.00
Each
units
Block Retroreflective 0.1 → 15 m PNP 4-Pin M12 Connector - - 30V - LED IP69K 100 mA - 500 μs
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
TWD15,293.00
Each
units
Block Background Suppression 50 → 3100 mm NPN/PNP 5-Pin M12 Connector - IO-LINK 30V M12 Connector Laser Light IP65, IP67 - IO-Link 2.5 ms, 6.5 ms, 12.5 ms, 24.5 ms, 96.5 ms
RS Stock No. 741-7613
Mfr. Part No.VTE18-4P4240V
BrandSick
TWD3,702.00
Each
units
Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP67, IP68, IP69K 100 mA - <=1 ms