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. 714-1612
Mfr. Part No.42JS-E2EZB1-F4
£25.20
Each
Units
Block Through Beam (Emitter) 10 m - 4-Pin Connector - 30V - LED IP67 - - 1 ms ABS
RS Stock No. 714-1587
Mfr. Part No.42JS-P2MPB1-F4
£42.50
Each
Units
Block Retroreflective 0.025 → 3.5 m PNP 4-Pin Connector - 30V - - IP67 - - 1 ms ABS
RS Stock No. 714-1583
Mfr. Part No.42JS-D2MPA1-F4
£41.90
Each
Units
Block Diffuse 0.003 → 0.8 m PNP 4-Pin Connector - 30V - - IP67 - - 1 ms ABS
RS Stock No. 714-1596
Mfr. Part No.42JS-R9MPA1-F4
£34.20
Each
Units
Block Through Beam (Receiver) 10 m PNP 4-Pin Connector - 30V - LED IP67 - - 1 ms ABS
RS Stock No. 714-1599
Mfr. Part No.42JS-R9MPA2-F4
£34.20
Each
Units
Block Through Beam (Receiver) 10 m PNP 4-Pin Connector - 30V - Infrared IP67 - - 1 ms ABS
RS Stock No. 714-1616
Mfr. Part No.42JS-E1EZB1-F4
£25.20
Each
Units
Block Through Beam (Emitter) 10 m - 4-Pin Connector - 30V - Infrared IP67 - - 1 ms ABS
RS Stock No. 714-1565
Mfr. Part No.42CSS-B2MPA1-D4
£97.50
Each
Units
Barrel Diffuse 100 mm PNP - - 30V - LED IP69K 100 mA - 1.25 ms Stainless Steel
RS Stock No. 714-1577
Mfr. Part No.42CSS-C2MPA1-D4
£69.90
Each
Units
Barrel Clear Object Detection 1 m PNP - - 30V - LED IP69K 100 mA - 1 ms Stainless Steel
RS Stock No. 134-8352
Mfr. Part No.42JT-D2LAT1-P4
£65.30
Each
Units
Block Diffuse 3 → 800 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect LED IP67, IP69K 30 mA IO-Link 0.5 ms ABS
RS Stock No. 134-8360
Mfr. Part No.42JT-E8EZB1-P4
£66.90
Each
Units
Block Through Beam (Emitter) 0 → 18 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect Laser Light IP67, IP69K 30 mA IO-Link 0.25 ms ABS
RS Stock No. 134-8353
Mfr. Part No.42JT-B2LAT2-P4
£102.00
Each
Units
Block Background Suppression 3 → 400 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect LED IP67, IP69K 30 mA IO-Link 0.5 ms ABS
RS Stock No. 134-8368
Mfr. Part No.42EF-P2MPB-F4
£46.80
Each
Units
Block Retroreflective 3 m PNP 4-Pin Connector - 30V 4-Pin Micro Quick Disconnect LED IP67 100 mA IO-Link 1 ms Polymer
RS Stock No. 134-8358
Mfr. Part No.42JT-B8LAT1-P4
£138.00
Each
Units
Block Background Suppression 4 → 120 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect Laser Light IP67, IP69K 30 mA IO-Link 0.5 ms ABS
RS Stock No. 134-8366
Mfr. Part No.42EF-D2MPAK-Y4
£22.47
Each
Units
Block Diffuse 500 mm PNP 4-Pin Connector - 30V 4-Pin Pico Quick Disconnect LED IP67 100 mA IO-Link 1 ms Polymer
RS Stock No. 134-8361
Mfr. Part No.42JT-R8LAT1-P4
£56.60
Each
Units
Block Through Beam (Receiver) 0 → 18 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect Laser Light IP67, IP69K 30 mA IO-Link 0.25 ms ABS
RS Stock No. 134-8354
Mfr. Part No.42JT-P2LAT1-P4
£67.60
Each
Units
Block Retroreflective 0.1 → 6 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect LED IP67, IP69K 30 mA IO-Link 0.5 ms ABS
RS Stock No. 134-8369
Mfr. Part No.42EF-P2MPB-Y4
£47.40
Each
Units
Block Retroreflective 3 m PNP 4-Pin Connector - 30V 4-Pin Pico Quick Disconnect LED IP67 100 mA IO-Link 1 ms Polymer
RS Stock No. 134-8359
Mfr. Part No.42JT-P8LAT1-P4
£106.00
Each
Units
Block Retroreflective 0.05 → 13 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect Laser Light IP67, IP69K 30 mA IO-Link 0.25 ms ABS
RS Stock No. 134-8367
Mfr. Part No.42EF-P2MPB-A2
£47.40
Each
Units
Block Retroreflective 3 m PNP Pre-Wired - 30V Cable LED IP67 100 mA IO-Link 1 ms Polymer
RS Stock No. 134-8357
Mfr. Part No.42JT-D8LAT1-P4
£102.00
Each
Units
Block Diffuse 5 → 250 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Pico Quick Disconnect Laser Light IP67, IP69K 30 mA IO-Link 0.33 ms ABS