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 Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 808-9121
Mfr. Part No.CX-411
BrandPanasonic
MYR559.74
Each
units
Block Through Beam (Emitter and Receiver) 10 m NPN 3-Wire Cable 2m - 24V Phototransistor - Red LED IP67 100 mA - 1 ms
RS Stock No. 361-5554
Mfr. Part No.EX-14A-PN
BrandPanasonic
MYR602.71
Each
units
Block Retro-Reflective 2 → 25 mm PNP-NO 3-Wire Cable 2m - 24V Phototransistor - LED IP67 50 mA - <=0.5 ms
RS Stock No. 361-5560
Mfr. Part No.EX-14B-PN
BrandPanasonic
MYR434.32
Each
units
Block Retro-Reflective 2 → 25 mm PNP Cable - 24V Phototransistor - LED IP67 50 mA - <=0.5 ms
RS Stock No. 808-9183
Mfr. Part No.CX-424
BrandPanasonic
MYR413.43
Each
units
Block Diffuse 100 mm NPN 2m Cable - 24V Phototransistor - Infrared LED IP67 100 mA - 1 ms
RS Stock No. 480-4985
Mfr. Part No.EQ501
BrandPanasonic
MYR748.78
Each
units
Block Diffuse 0.1 → 2.5 m Relay 4-Terminal Screw 250V 30V - Screw Infrared LED IP67 3 A - <=20 ms
RS Stock No. 808-9171
Mfr. Part No.CX-422
BrandPanasonic
MYR388.37
Each
units
Block Diffuse 800 mm NPN 2m Cable - 24V Phototransistor - Infrared LED IP67 100 mA - 1 ms
RS Stock No. 808-9159
Mfr. Part No.CX-491
BrandPanasonic
MYR397.55
Each
units
Block Retro-Reflective 3 m NPN 2m Cable - 24V Phototransistor - Red LED IP67 100 mA - 1 ms
RS Stock No. 361-5532
Mfr. Part No.EX-13EA-PN
BrandPanasonic
MYR447.05
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V Phototransistor - LED IP67 50 mA - <=0.5 ms
RS Stock No. 361-5526
Mfr. Part No.EX-13B-PN
BrandPanasonic
MYR458.83
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP-NO 3-Wire Cable 2m - 24V Phototransistor - LED IP67 50 mA - <=0.5 ms
RS Stock No. 877-7408
Mfr. Part No.HG-C1100
BrandPanasonic
MYR2,265.07
Each
units
Block Background Suppression 100 mm NPN Cable - 24V Laser - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS Stock No. 125-4525
Mfr. Part No.PM-U25-C3
BrandPanasonic
MYR139.40
Each
units
Fork Through Beam (Fork) 6 mm NPN 3m Cable - 24V Phototransistor Cable Infrared LED IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 901-2780
Mfr. Part No.CX-422-P-J
BrandPanasonic
MYR442.03
Each
units
Block Diffuse Maximum of 800 mm PNP M12 Connector - 24V LED - Infrared LED IP67 - - 1 ms
RS Stock No. 808-9130
Mfr. Part No.CX-412
BrandPanasonic
MYR424.45
Each
units
Block Through Beam (Emitter and Receiver) 15 m NPN 2m Cable - 24V Phototransistor - Infrared LED IP67 100 mA - 1 ms
RS Stock No. 810-2980
Mfr. Part No.NX5-D700A
BrandPanasonic
MYR387.19
Each
units
Block Diffuse 700 mm - Cable 240V 240V Phototransistor Cable Infrared LED IP66 1 A ac, 2 A dc - 10 ms
RS Stock No. 877-7389
Mfr. Part No.HG-C1030-P
BrandPanasonic
MYR2,314.80
Each
units
Block Background Suppression 30 mm PNP 5-Wire Cable 2m - 24V Laser - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS Stock No. 808-9199
Mfr. Part No.CX-442
BrandPanasonic
MYR494.46
Each
units
Block Diffuse 20 → 300 mm NPN 2m Cable - 24V Phototransistor - Red LED IP67 100 mA - 1 ms
RS Stock No. 812-8213
Mfr. Part No.CY-192A-P-Z-Y
BrandPanasonic
MYR119.05
Each
units
Barrel Retro-Reflective 4 m PNP M12 Connector - 24V Photoelectric Array - Infrared LED IP67 35 mA - 1 ms
RS Stock No. 812-8153
Mfr. Part No.CX-441
BrandPanasonic
MYR386.49
Each
units
Block Retro-Reflective 2 → 50 mm NPN 2m Cable - 24V LED - Red LED IP67 20 mA - 1 ms
RS Stock No. 125-4562
Mfr. Part No.PM-T65-P
BrandPanasonic
MYR90.54
Each
units
Fork Through Beam (Fork) 6 mm PNP 4-Pin Connector - 24V Phototransistor 4-Pin Connector Infrared LED IP40 50 (Source Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 808-9360
Mfr. Part No.CX-411A-C05
BrandPanasonic
MYR305.61
Each
units
Block Through Beam (Emitter and Receiver) 10 m NPN 2m Cable - 24V Phototransistor - Red LED IP67 100 mA - 1 ms