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. 908-4035
Mfr. Part No.HG-C1200
BrandPanasonic
TWD18,063.00
Each
units
Block Background Suppression 200 mm NPN Cable - - 24V - Laser Light IP67 40 mA - 10 ms
RS Stock No. 741-7613
Mfr. Part No.VTE18-4P4240V
BrandSick
TWD3,702.00
Each
units
Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP67, IP68, IP69K 100 mA - <=1 ms
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
TWD933.00
Each
units
Fork Through Beam (Fork) 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
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. 818-1501
Mfr. Part No.EE-SX770
BrandOmron
TWD1,378.00
Each
units
- - - NPN - - - - - GaAs Infrared LED IP60 - - -
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. 908-7110
Mfr. Part No.OPB745
BrandOptek
TWD97.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 463-8384
Mfr. Part No.RLK39-54/31/40A/116
TWD8,769.00
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units
Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V - 240V - LED IP67 3 A - <=20 ms
RS Stock No. 745-2186
Mfr. Part No.E3ZLS66
BrandOmron
TWD5,329.00
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Block Background Suppression 20 → 200 mm NPN M8 Connector - - 24V - LED IP67 100 mA - 1 ms
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
TWD5,846.00
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Barrel Retroreflective 3.2 m PNP 4-Pin M12 Connector - - 30V - LED IP67 200 mA - <1 ms
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,377.00
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Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 902-7186
Mfr. Part No.BOS 21M-PA-PK10-S4
BrandBALLUFF
TWD8,376.00
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Block Retroreflective 0 → 4 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 500 μs
RS Stock No. 289-0158
Mfr. Part No.VT18-2T1410
BrandSick
TWD4,900.00
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Barrel Diffuse 2 → 100 mm Triac 4-Pin M12 Connector 253V - - - Infrared IP67 300 mA - <=20 ms
RS Stock No. 219-2404
Mfr. Part No.EE-SY671
BrandOmron
TWD1,313.00
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Block Retroreflective 1 → 5 mm NPN Non-Solder Connector - - 24V - Infrared IP50 100 mA - -
RS Stock No. 768-5863
Mfr. Part No.E3FATP112M
BrandOmron
TWD3,485.00
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Barrel Through Beam (Emitter and Receiver) 20 m PNP 4-Wire Cable 2m - - 30V - LED IP67, IP69K 40 mA - 0.5 ms
RS Stock No. 860-1620
Mfr. Part No.SM312CV2
BrandBanner
TWD5,021.00
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Block Convergent 43 mm NPN/PNP Cable - - 30V - LED IP67 25 mA - 1 ms
New
RS Stock No. 203-1357
Mfr. Part No.SOOD-BS-L-PN-50
BrandFesto
TWD5,015.00
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Block Diffuse 50 mm NPN, PNP Cable With Plug - - - - - - - - -
New
RS Stock No. 204-7582
Mfr. Part No.OHDM 12P6901/S35A
BrandBaumer
TWD22,168.00
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Block Background Suppression 120 mm PNP 4-Pin M8 Connector - - - - - - - - -
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
TWD2,695.00
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Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - - 26.4V - LED IP69K 100 mA - 1 ms
RS Stock No. 841-1732
Mfr. Part No.E3SLS20XB4
BrandOmron
TWD10,421.00
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Barrel Diffuse 50 → 250 mm PNP Pre-Wired - - 24V - Infrared IP67 100 mA - 1 ms