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. 891-9501
Mfr. Part No.ML7-8-H-350-IR/59/65a/136/143
TWD8,711.00
Each
units
Block Background Suppression 10 → 350 mm Push Pull 4-Pin M8 Connector - - 30V M8 Connector Infrared IP67, IP69K <20 mA - 2 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. 463-8384
Mfr. Part No.RLK39-54/31/40A/116
TWD8,769.00
Each
units
Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V - 240V - LED IP67 3 A - <=20 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. 124-0334
Mfr. Part No.OBT300-R101-2EP-IO-V31-L
TWD5,019.00
Each
units
Block Background Suppression 7 → 300 mm NPN/PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector Laser Light IP67, IP69, IP69K 100 mA IO-Link 300 μs
RS Stock No. 714-1622
Mfr. Part No.ML100-55/103/115
TWD3,072.00
Each
units
Block Retroreflective 5 m PNP 3-Wire Cable 2m - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 891-9472
Mfr. Part No.GLV18-8-450/25/102/115
TWD2,199.00
Each
units
Block Diffuse 0 → 450 mm NPN Cable - - 30V - LED IP67 <20 mA - ≤1 ms
RS Stock No. 781-5957
Mfr. Part No.ML300-55-6m-RT/25/95/120
TWD5,409.00
Each
units
Block Retroreflective 0 → 6 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 714-1625
Mfr. Part No.ML100-55/95/103
TWD3,058.00
Each
units
Block Retroreflective 5 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 714-1650
Mfr. Part No.ML100-8-H-350-RT/102/115
TWD4,398.00
Each
units
Block Diffuse 5 → 350 mm NPN Cable - - 30V - LED IP67 100 mA - 1 ms
RS Stock No. 781-5963
Mfr. Part No.ML300-55-2m-RT/59/103/115
TWD3,116.00
Each
units
Block Retroreflective 0 → 2 m PNP Cable - - 30V - LED IP65 100 mA - 0.5 ms
RS Stock No. 510-3249
Mfr. Part No.RLK29-55/59/116-SET
TWD4,339.00
Each
units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V - 230V - LED IP67 2 A - 50 ms
RS Stock No. 714-1653
Mfr. Part No.ML100-8-H-350-RT/95/102
TWD4,398.00
Each
units
Block Diffuse 5 → 350 mm NPN 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 1 ms
RS Stock No. 891-9476
Mfr. Part No.GLV18-8-H-120/115/120
TWD3,035.00
Each
units
Block Background Suppression 15 → 120 mm PNP 4-Wire Cable 2m - - 30V - LED IP67 <15 mA - ≤1 ms
RS Stock No. 297-5805
Mfr. Part No.RLK39-8-800/31/40A/116
TWD8,711.00
Each
units
Block Diffuse 800 mm Relay 4-Terminal Screw 240V - 240V - Infrared LED IP67 3 A - <=20 ms
RS Stock No. 229-119
Mfr. Part No.GLV18-55/115/120
TWD2,154.00
Each
units
Barrel Retroreflective 4 m PNP 4-Wire Cable 2m - - 30V - LED IP67 100 mA - <=1 ms
RS Stock No. 817-1554
Mfr. Part No.RL31-54/73c/136
TWD3,059.00
Each
units
Block Retroreflective 9000 mm Push Pull 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=1 ms
RS Stock No. 714-1628
Mfr. Part No.ML100-55/95/102
TWD3,058.00
Each
units
Block Retroreflective 5 m NPN 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 891-9505
Mfr. Part No.RL28-8-H-2000-IR/105/110
TWD11,705.00
Each
units
Block Background Suppression 20 → 2000 mm Push Pull 5-Pin M12 Connector - - 30V M12 Connector Infrared IP67 40 mA - 2 ms
RS Stock No. 714-1669
Mfr. Part No.M100/MV100-RT/76a/95/103
TWD4,083.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 0.5 ms