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 Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 908-7163
Mfr. Part No.OPB829DZ
BrandOptek
MYR19.31
Each
units
Block Through Beam (Fork) 3.18 → 8 mm Phototransistor Wire - 1.7V Wire Lead LED - 50 mA - - Plastic
RS Stock No. 306-2152
Mfr. Part No.E3TFD132M
BrandOmron
MYR581.78
Each
units
Block Diffuse 5 → 30 mm PNP 3-Wire Cable 2m - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 822-4670
Mfr. Part No.EE-SX870A
BrandOmron
MYR185.05
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN Pre-Wired Cable - 24V - Infrared IP60 35 mA - - Polybutylene Phthalate
RS Stock No. 447-137
Mfr. Part No.GL50-RT/32/40A/98A
MYR1,046.48
Each
units
Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - 1 ms Aluminium
RS Stock No. 488-138
Mfr. Part No.O5S200
MYR437.51
Each
units
Block Through Beam (Emitter) 20 m - M12 Connector - 36V - LED IP67 200 mA - - Polyamide
RS Stock No. 860-1320
Mfr. Part No.S18SN6FF100Q
BrandBanner
MYR691.39
Each
units
Barrel Diffuse Maximum of 100 mm NPN 4-Pin M12 Connector - 30V - LED IP69K 35 mA - 3 (OFF) ms, 3 (ON) ms PBT Polyester
RS Stock No. 729-5110
BrandRS PRO
MYR428.08
Each
units
Barrel Retroreflective 0.05 → 7 m NPN 4-Wire Cable 2m - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 425-8146
Mfr. Part No.OJ5026
MYR659.49
Each
units
Block Retroreflective 2 m PNP M8 Connector - 30V - LED IP67 200 mA - - ABS
RS Stock No. 860-1291
Mfr. Part No.S18MBQ
BrandBanner
MYR1,984.69
Each
units
Barrel - - Bipolar NPN/PNP 5-Pin M12 Connector - 30V - LED IP67 43 mA - 20 ms Thermoplastic Polyester
RS Stock No. 768-5923
Mfr. Part No.E3FA-DP12 2M
BrandOmron
MYR332.30
Each
units
Barrel Diffuse 300 mm PNP 4-Wire Cable 2m - 30V - LED IP67, IP69K 25 mA - 0.5 ms ABS
RS Stock No. 218-923
Mfr. Part No.WT100L-E2241
BrandSick
MYR734.93
Each
units
Block Diffuse 450 mm NPN 4-Pin M8 Connector - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 185-2212
Mfr. Part No.FHDM 16P5001/S14
BrandBaumer
MYR1,322.19
Each
units
Block Diffuse 20 → 450 mm PNP 4-Pin M12 Connector - 30V - LED IP67 200 mA - <1 ms Die Cast Zinc
RS Stock No. 901-2771
Mfr. Part No.CX-412-P-Z
BrandPanasonic
MYR607.60
Each
units
Block Through Beam (Emitter and Receiver) Maximum of 15 m PNP 4-Pin M8 Connector - 24V - Infrared IP67 - - 1 ms PBT
RS Stock No. 856-8605
Mfr. Part No.PH18CNP50PASA
MYR252.36
Each
units
Block Retro-Reflective Maximum of 5 m PNP NO/NC Cable - 30V - LED IP66, IP69K ≤20 mA - ≤1 ms ABS
RS Stock No. 288-9805
Mfr. Part No.WT150-P460
BrandSick
MYR658.57
Each
units
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <=0.5 ms ABS, PC
RS Stock No. 891-9505
Mfr. Part No.RL28-8-H-2000-IR/105/110
MYR1,598.48
Each
units
Block Background Suppression 20 → 2000 mm Push Pull 5-Pin M12 Connector - 30V M12 Connector Infrared IP67 40 mA - 2 ms ABS Plastic
RS Stock No. 463-8390
Mfr. Part No.RLK39-54-Z/31/40A/116
MYR941.80
Each
units
Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V 240V - LED IP67 3 A - <=20 ms PBT
RS Stock No. 908-7110
Mfr. Part No.OPB745
BrandOptek
MYR11.53
Each
units
- - - - - - - - - - - - - -
RS Stock No. 530-0917
Mfr. Part No.WTB27-3S1511
BrandSick
MYR1,266.54
Each
units
Block Diffuse 30 → 1600 mm Relay 4-Wire Cable 2m 250V 24V - Infrared IP66, IP67 3 A ac, 32 A dc - <=10 ms ABS
RS Stock No. 328-1527
Mfr. Part No.GLV12-8-200/36/40B/115
MYR561.71
Each
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Barrel Diffuse 200 mm NPN 4-Wire Cable 2m - 30V - LED IP67 300 mA - <=0.7 ms Nickel Plated Brass
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