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. 170-0724
Mfr. Part No.OPB704W-Z
BrandOptek
TWD136.90
Each (In a Bag of 100)
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - - Infrared - - - -
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. 530-0866
Mfr. Part No.WTB27-3P2411
BrandSick
TWD9,750.00
Each
units
Block Diffuse 30 → 1600 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP69K 100 mA - <=1.5 ms
RS Stock No. 818-1501
Mfr. Part No.EE-SX770
BrandOmron
TWD1,313.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -
RS Stock No. 745-2186
Mfr. Part No.E3ZLS66
BrandOmron
TWD5,329.00
Each
units
Block Background Suppression 20 → 200 mm NPN M8 Connector - - 24V - LED IP67 100 mA - 1 ms
RS Stock No. 218-923
Mfr. Part No.WT100L-E2241
BrandSick
TWD6,300.00
Each
units
Block Diffuse 450 mm NPN 4-Pin M8 Connector - - 30V - Laser Light IP65 100 mA - <0.25 ms
RS Stock No. 701-8783
Mfr. Part No.WL4S-3F2130V
BrandSick
TWD4,812.00
Each
units
Block Retroreflective 4 m PNP 3-Pin M8 Connector - - 30V - LED IP69K 100 mA - <0.5 ms
RS Stock No. 818-1504
Mfr. Part No.EE-SX872
BrandOmron
TWD1,448.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -
RS Stock No. 256-433
Mfr. Part No.E3JMR4M4G
BrandOmron
TWD3,732.00
Each
units
Block Retro-Reflective 4 m Relay Terminal Block 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 909-2881
Mfr. Part No.Q4XTBLAF300-Q8
BrandBanner
TWD14,734.00
Each
units
Barrel Diffuse 25 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K - - 50 ms
RS Stock No. 125-4543
Mfr. Part No.PM-L45
BrandPanasonic
TWD685.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 1m Cable - - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 909-2869
Mfr. Part No.Q3XTBLD-Q8
BrandBanner
TWD8,540.00
Each
units
Barrel Diffuse 0 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 609-0813
Mfr. Part No.XUX1ARCNT16
TWD4,953.00
Each
units
Block Retroreflective 14 m Relay 5-Terminal Screw 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
TWD1,156.00
Each
units
Block Retroreflective 1 → 5 mm NPN - - - 24V - Infrared IP50 100 mA - -
RS Stock No. 818-1722
Mfr. Part No.EE-SX670-WR 1M
BrandOmron
TWD925.00
Each
units
Fork Through Beam (Fork) 5 mm NPN - - - 24V Pre-Wired Infrared IP50 35 mA - -
RS Stock No. 903-3942
BrandRS PRO
TWD805.00
Each
units
Fork Through Beam (Fork) 7 mm PNP Cable - - 30V Pre-Wired Infrared IP64 15 mA - 1 ms
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,377.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 812-8395
Mfr. Part No.PM2-LH10-C1
BrandPanasonic
TWD2,963.00
Each
units
Block Diffuse 2.5 → 8 mm NPN Cable - - 24V Wire Lead LED - 80 mA - 0.8 ms
RS Stock No. 821-0163
Mfr. Part No.EE-SX871
BrandOmron
TWD952.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -
RS Stock No. 219-011
Mfr. Part No.WL100L-E1131
BrandSick
TWD6,300.00
Each
units
Block Retroreflective 0.08 → 12 m NPN Cable - - 30V - Laser Light IP65 100 mA - <0.25 ms