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. 898-6713
Mfr. Part No.115970 MV12-F1/82b/124/128
MYR646.23
Each
units
Block Through Beam (Receiver) 0 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V M12 LED IP67 45 mA - 0.5 ms Fibreglass Reinforced Plastic PC (Laterals)
RS Stock No. 898-6719
Mfr. Part No.115969 M12-F1/76b/124
MYR434.37
Each
units
Block Through Beam (Emitter) 0 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V M12 LED IP67 35 mA - 0.5 ms Fibreglass Reinforced Plastic PC (Laterals)
RS Stock No. 450-2926
Mfr. Part No.OBT200-18GM60-E4
MYR415.16
Each
units
Barrel Diffuse 200 mm NPN 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 891-9501
Mfr. Part No.ML7-8-H-350-IR/59/65a/136/143
MYR1,033.64
Each
units
Block Background Suppression 10 350 mm Push Pull 4-Pin M8 Connector - 30V M8 Connector Infrared IP67, IP69K <20 mA - 2 ms PC
RS Stock No. 447-131
Mfr. Part No.GL80-RT/32/40A/98A
MYR993.62
Each
units
Fork Through Beam (Fork) 80 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - 1 ms Aluminium
RS Stock No. 450-2948
Mfr. Part No.OBT200-18GM60-E5
MYR415.16
Each
units
Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 714-1622
Mfr. Part No.ML100-55/103/115
MYR362.87
Each
units
Block Retroreflective 5 m PNP 3-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms PC
RS Stock No. 817-1554
Mfr. Part No.RL31-54/73c/136
MYR361.27
Each
units
Block Retroreflective 9000 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms Plastic
RS Stock No. 510-3249
Mfr. Part No.RLK29-55/59/116-SET
MYR514.95
Each
units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V 230V - LED IP67 2 A - 50 ms ABS
RS Stock No. 297-5805
Mfr. Part No.RLK39-8-800/31/40A/116
MYR1,033.64
Each
units
Block Diffuse 800 mm Relay 4-Terminal Screw 240V 240V - Infrared LED IP67 3 A - <=20 ms PBT
RS Stock No. 817-1608
Mfr. Part No.RLK31-54/25/31/115
MYR361.27
Each
units
Block Retroreflective 9000 mm Push Pull 5-Wire Cable 2m 240V 240V - LED IP67 3 A - <=25 ms PC
RS Stock No. 780-0024
Mfr. Part No.OBE2000-R2-SE2
MYR683.05
Each
units
Block Through Beam (Emitter and Receiver) 0 2 m, 0 200 mm PNP - - 30V Cable LED IP67 50 mA - 600 μs ABS, ABT, PC
RS Stock No. 124-0317
Mfr. Part No.OBE12M-R100-S2EP-IO-V31
MYR397.55
Each
units
Block Through Beam (Emitter and Receiver) 0 12 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Connector LED IP67, IP69, IP69K 100 mA IO-Link 0.5 ms PC
RS Stock No. 714-1647
Mfr. Part No.ML100-8-1000-RT/103/115
MYR357.53
Each
units
Block Diffuse 1000 mm PNP 3-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms PC
RS Stock No. 447-147
Mfr. Part No.GL30-RT/32/40A/98A
MYR900.77
Each
units
Fork Through Beam (Fork) 30 mm PNP 3-Pin M8 Connector - 30V - LED IP67 100 mA - <=160 μs Die Cast Zinc
RS Stock No. 124-0329
Mfr. Part No.OBE12M-R101-S2EP-IO-V31
MYR397.55
Each
units
Block Through Beam (Emitter and Receiver) 0 12 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Connector LED IP67, IP69, IP69K 100 mA IO-Link 0.5 ms PC
RS Stock No. 714-1650
Mfr. Part No.ML100-8-H-350-RT/102/115
MYR521.89
Each
units
Block Diffuse 5 350 mm NPN Cable - 30V - LED IP67 100 mA - 1 ms PC
RS Stock No. 784-0000
Mfr. Part No.RL28-8-H-1500-LAS/47/105
MYR1,665.99
Each
units
Block Background Suppression 50 1500 mm PNP 5-Pin M12 Connector - 30V - Laser Light IP67 200 mA - 3.5 ms ABS Plastic
RS Stock No. 817-1605
Mfr. Part No.RLK31-54/31/115
MYR361.27
Each
units
Block Retroreflective 9000 mm Push Pull 5-Wire Cable 2m 240V 240V - LED IP67 3 A - <=25 ms PC
RS Stock No. 714-1631
Mfr. Part No.ML100-55/102/115
MYR362.87
Each
units
Block Retroreflective 5 m NPN 3-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms PC