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. 786-5908
Mfr. Part No.WL11G-2B2531
BrandSick
SGD217.60
Each
units
Block Retroreflective 0 → 4 m NPN/PNP 5-Pin M12 Connector - - 30V - LED IP66, IP67, IP69K 100 mA - 330 μs
RS Stock No. 361-5554
Mfr. Part No.EX-14A-PN
BrandPanasonic
SGD112.67
Each
units
Block Retroreflective 2 → 25 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS Stock No. 784-6692
Mfr. Part No.DT50-P1123
BrandSick
SGD560.00
Each
units
Block Background Suppression 200 → 10000 mm Analogue 5-Pin M12 Connector - - 30V - Laser Light IP65 100 mA - 20 ms, 30 ms
RS Stock No. 399-1959
Mfr. Part No.FPDK14P5101/S35A
BrandBaumer
SGD166.32
Each
units
Block Retroreflective 7.2 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <1 ms
RS Stock No. 123-4133
Mfr. Part No.OADM 20I5460/S14C
BrandBaumer
SGD2,376.63
Each
units
Block Background Suppression 30 → 130 mm Analogue 5-Pin M12 Connector - - 28V 5-Pin Connector Laser Light IP67 120 mA - <10 ms
RS Stock No. 891-9514
Mfr. Part No.RLK31-8-2500-IR/31/115
SGD105.00
Each
units
Block Diffuse 0 → 2500 mm Relay 5-Wire Cable 2m 240V - 240V - Infrared IP67 40 mA - 25 ms
RS Stock No. 909-2869
Mfr. Part No.Q3XTBLD-Q8
BrandBanner
SGD315.88
Each
units
Barrel Diffuse 0 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 374-2066
Mfr. Part No.E3ZD86
BrandOmron
SGD200.70
Each
units
Block Diffuse 5 → 100 mm PNP 4-Pin M8 Connector - - 26.4V - Infrared IP69K 100 mA - 1 ms
RS Stock No. 303-2139
Mfr. Part No.E3TST122M
BrandOmron
SGD140.85
Each
units
Block Through Beam (Emitter and Receiver) 1 m NPN Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 361-5510
Mfr. Part No.EX-13A-PN
BrandPanasonic
SGD178.08
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. 194-4018
Mfr. Part No.OPB608A
BrandOptek
SGD2.35
Each
units
Block Retroreflective 1.27 → 9.525 mm NPN - - - - Wire Lead Infrared - - - -
RS Stock No. 510-3255
Mfr. Part No.RLK29-55/25/116-SET
SGD174.00
Each
units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V - 230V - LED IP67 2 A - 50 ms
RS Stock No. 375-6302
Mfr. Part No.WT12L-2B510
BrandSick
SGD761.60
Each
units
Block Diffuse 20 → 50 mm PNP 5-Pin M12 Connector - - 30V - Laser Light IP69K 100 mA - <=200 μs
RS Stock No. 219-2303
Mfr. Part No.EE-SX673
BrandOmron
SGD51.80
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
RS Stock No. 256-433
Mfr. Part No.E3JMR4M4G
BrandOmron
SGD231.35
Each
units
Block Retro-Reflective 4 m Relay Terminal Block 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 444-3518
Mfr. Part No.XUM0AKSAM8T
SGD106.21
Each
units
Block Through Beam (Emitter) 10 m Relay 4-Pin M8 Connector - - 24V - Infrared IP67 100 mA - <2 ms
RS Stock No. 818-1548
Mfr. Part No.E3JM-R4M4-US
BrandOmron
SGD252.88
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
SGD231.83
Each
units
Block Diffuse, Retro-Reflective, Through Beam (Receiver) 1.3 m, 2 m, 11 m, 40 m Relay Screw Clamp 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 306-2152
Mfr. Part No.E3TFD132M
BrandOmron
SGD187.87
Each
units
Block Diffuse 5 → 30 mm PNP 3-Wire Cable 2m - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 908-7110
Mfr. Part No.OPB745
BrandOptek
SGD4.40
Each
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