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, these are: through beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects, or measure distance to the object.
Through beam Sensors
Through beam sensors 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 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 reflect materials is different to that from the reflector.
Diffuse Sensors
Diffuse sensors 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.

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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. 455-4983
Mfr. Part No.XUK0ARCTL2
HK$1,295.57
Each
units
Compact Diffuse, Retro-Reflective, Through Beam (Receiver) 0.28 m, 0.8 m, 4 m, 30 m Relay Cable 240V 240V - - Infrared LED IP65 3 A - <25 ms
RS Stock No. 800-4031
Mfr. Part No.OD1-B100H50I14
BrandSick
HK$11,278.95
Each
units
Block Background Suppression 50 → 150 mm Analogue 4-Pin M8 Connector - 24V Laser - Laser Light IP67 20 mA - 2 ms, 4 ms, 8 ms, 16 ms
RS Stock No. 609-9056
Mfr. Part No.EQ511
BrandPanasonic
HK$1,763.69
Each
units
Block Diffuse 0.1 → 2.5 m PNP Terminal Block - 24V Phototransistor Screw Infrared LED IP67 100 mA - 2 ms
RS Stock No. 778-8700
Mfr. Part No.E3JK-DR12 2M
BrandOmron
HK$810.15
Each
units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V 240V LED Wire Lead Red LED IP64 - - 20 ms
RS Stock No. 256-411
BrandRS PRO
HK$708.46
Each
units
Barrel Retro-Reflective 4 m NPN & PNP-NC\NO M12 Connector - 30V Phototransistor - Infrared LED IP67 100 mA - 6 ms
RS Stock No. 444-3401
Mfr. Part No.XUB0APSNM12
HK$722.48
Each
units
Barrel Diffuse, Retro-Reflective, Through Beam (Receiver) 0.12 m, 0.3 m, 2 m, 15 m PNP 4-Pin M12 Connector - 24V Phototransistor - Infrared LED IP65, IP67 100 mA - <2 ms
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
HK$1,333.08
Each
units
Long Distance Diffuse, Retro-Reflective, Through Beam (Receiver) 1.3 m, 2 m, 11 m, 40 m Relay Screw Clamp 240V 240V - - Infrared LED IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 444-3530
Mfr. Part No.XUK0AKSAM12
HK$955.50
Each
units
Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m PNP 4-Pin M12 Connector - 24V Phototransistor - Infrared LED IP65 100 mA - <2 ms
RS Stock No. 768-9461
Mfr. Part No.WL9-3P2430
BrandSick
HK$1,000.45
Each
units
Block Retro-Reflective 0 → 4 m PNP-NO/NC 4-Pin M12 Connector - 30V Phototransistor - LED IP66, IP67, IP69K 100 mA - <0.5 ms
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
HK$1,315.60
Each
units
Block Retro-Reflective 4 m Relay 5-Terminal Screw 250V 5V - - LED IP66 3 A - 30 ms
RS Stock No. 219-2274
Mfr. Part No.EE-SX670
BrandOmron
HK$186.57
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - 24V Phototransistor - Infrared LED IP50 100 mA - -
RS Stock No. 256-433
Mfr. Part No.E3JMR4M4G
BrandOmron
HK$1,023.88
Each
units
Block Retro-Reflective 4 m Relay Terminal Block 250V 5V - - LED IP66 3 A - 30 ms
RS Stock No. 493-7316
Mfr. Part No.WF2-40B410
BrandSick
HK$1,418.63
Each
units
Fork Through Beam (Fork) 2 mm NPN & PNP-NC\NO 4-Pin M8 Connector - 30V Phototransistor - Infrared LED IP65 100 mA - 100 μs
RS Stock No. 219-005
Mfr. Part No.DT20-P214B
BrandSick
HK$7,382.48
Each
units
Block Background Suppression 100 → 600 mm Analogue 5-Pin M12 Connector - 30V Laser, Phototransistor - Laser Light IP65 100 mA - 2.8 ms
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
HK$810.15
Each
units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V 240V LED Wire Lead Red LED IP64 - - 20 ms
RS Stock No. 814-0361
Mfr. Part No.OID200
HK$1,478.99
Each
units
Barrel Background Suppression 0.03 → 2 m NPN & PNP-NC\NO M12 Connector - 30V Laser Wire Lead LED IP65, IP67 <75 mA @ 24 V dc IO-Link -
RS Stock No. 458-828
Mfr. Part No.WL12-3P2431
BrandSick
HK$1,721.47
Each
units
Block Retro-Reflective 7 m PNP-NO/NC 4-Pin M12 Connector - 30V Phototransistor - LED IP69K 100 mA - <=330 μs
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
HK$196.32
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Phototransistor Connector Infrared LED IP50 12 mA - -
RS Stock No. 358-7926
Mfr. Part No.WL260-R270
BrandSick
HK$1,251.84
Each
units
Block Retro-Reflective 0.01 → 15 m Relay Cable 240V 30V - - LED IP67 3 A - <=20 ms
RS Stock No. 817-1557
Mfr. Part No.RL31-8-1200-RT/73c/136
HK$580.85
Each
units
Block Diffuse 1200 mm Push Pull 4-Pin M12 Connector - 30V LED - LED IP67 100 mA - <=1 ms
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