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. 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 Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
HK$1,315.60
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
HK$819.12
Each
units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
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 ABS
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 - Infrared IP50 100 mA - - PBT
RS Stock No. 768-5881
Mfr. Part No.E3FARP21
BrandOmron
HK$503.67
Each
units
Barrel Retro-Reflective 0.1 → 4 m PNP 4-Pin M12 Connector - 30V - LED IP67, IP69K 25 mA - 0.5 ms ABS
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 Connector Infrared IP50 12 mA - - PBT
RS Stock No. 374-2072
Mfr. Part No.E3ZD822MOMS
BrandOmron
HK$874.00
Each
units
Block Diffuse 1 m PNP 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
HK$212.45
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
HK$172.04
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 778-8704
Mfr. Part No.E3JK-RR11 2M
BrandOmron
HK$922.59
Each
units
Block Retroreflective 7 m, 100 mm Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
HK$793.80
Each
units
Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - 26.4V - LED IP69K 100 mA - 1 ms PBT
RS Stock No. 617-0666
Mfr. Part No.E3ZLR86
BrandOmron
HK$1,257.02
Each
units
Block Retroreflective 0.2 → 7 m PNP 4-Pin M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 420-473
Mfr. Part No.E3SAR86
BrandOmron
HK$1,503.61
Each
units
Block Retroreflective 0.1 → 2 m PNP M12 Connector - 30V - LED IP67 100 mA - 0.5 ms PBT
RS Stock No. 818-4103
Mfr. Part No.E3Z-T61 2M
BrandOmron
HK$1,054.35
Each
units
Block Through Beam (Emitter and Receiver) Maximum of 15 mm NPN Cable - 26.4V Pre-Wired LED IP67 100 mA - 1 ms Polybutylene Terephthalate
RS Stock No. 818-1520
Mfr. Part No.EE-SPY411
BrandOmron
HK$388.19
Each
units
Block Convergent 2 → 5 mm NPN - - 24V Connector Infrared IP50 50 mA - - PC
RS Stock No. 818-1558
Mfr. Part No.E3JM-DS70M4T-US
BrandOmron
HK$2,096.13
Each
units
Block Diffuse Maximum of 700 mm Relay 5-Terminal Screw 250V 5V - Infrared IP66 3 A - 30 ms ABS
RS Stock No. 198-0553
Mfr. Part No.E3SGS3E4
BrandOmron
HK$2,534.64
Each
units
Fork Through Beam (Fork) 30 mm NPN Pre-Wired Cable - 24V - Infrared IP67 80 mA - 1 ms Metal
RS Stock No. 818-1674
Mfr. Part No.E3T-ST13
BrandOmron
HK$1,252.85
Each
units
Block Through Beam (Emitter and Receiver) Maximum of 1 m PNP - - 26.4V Pre-Wired LED IP67 50 mA - 1 ms PBT
RS Stock No. 729-9070
Mfr. Part No.E3Z-G82 (HK)
BrandOmron
HK$930.54
Each
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Fork Through Beam 25 mm PNP Pre-Wired Cable - 26.4V - Infrared IP64 100 mA - 1 ms ABS