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. 307-913
Mfr. Part No.OPB704
BrandOptek
TWD95.00
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. 818-1548
Mfr. Part No.E3JM-R4M4-US
BrandOmron
TWD4,658.00
Each
units
Block Retroreflective Maximum of 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 361-5532
Mfr. Part No.EX-13EA-PN
BrandPanasonic
TWD4,010.00
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS Stock No. 361-5554
Mfr. Part No.EX-14A-PN
BrandPanasonic
TWD3,511.00
Each
units
Block Retroreflective 2 → 25 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS Stock No. 818-1520
Mfr. Part No.EE-SPY411
BrandOmron
TWD1,492.00
Each
units
Block Convergent 2 → 5 mm NPN - - - 24V Connector Infrared IP50 50 mA - -
RS Stock No. 786-5851
Mfr. Part No.WL260-S270
BrandSick
TWD5,568.00
Each
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Block Retroreflective 0.01 → 15 m Relay 5-Terminal Screw 240V - 240V - LED IP67 3 A - 20 ms
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,377.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
TWD5,846.00
Each
units
Barrel Retroreflective 3.2 m PNP 4-Pin M12 Connector - - 30V - LED IP67 200 mA - <1 ms
RS Stock No. 786-5927
Mfr. Part No.WT24-2B410
BrandSick
TWD11,519.00
Each
units
Block Background Suppression 100 → 2500 mm NPN/PNP 4-Pin M12 Connector - - 30V - Infrared IP69K 100 mA - 500 μs
RS Stock No. 289-0158
Mfr. Part No.VT18-2T1410
BrandSick
TWD4,196.00
Each
units
Barrel Diffuse 2 100 mm Triac 4-Pin M12 Connector 253V - - - Infrared IP67 300 mA - <=20 ms
RS Stock No. 627-6556
Mfr. Part No.OPB704W-Z
BrandOptek
TWD142.00
Each
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - - Infrared - - - -
RS Stock No. 818-1501
Mfr. Part No.EE-SX770
BrandOmron
TWD1,412.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -
RS Stock No. 701-8783
Mfr. Part No.WL4S-3F2130V
BrandSick
TWD4,812.00
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units
Block Retroreflective 4 m PNP 3-Pin M8 Connector - - 30V - LED IP69K 100 mA - <0.5 ms
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 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 908-7129
Mfr. Part No.OPB750T
BrandOptek
TWD160.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
TWD5,769.00
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
TWD1,026.00
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
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. 818-1504
Mfr. Part No.EE-SX872
BrandOmron
TWD1,412.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -