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. 818-1554
Mfr. Part No.E3JM-R4M4T-US
BrandOmron
MYR967.68
Each
units
Block Retroreflective Maximum of 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 786-5936
Mfr. Part No.WTB140-P430
BrandSick
MYR922.46
Each
units
Block Background Suppression 2 → 500 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PBT
RS Stock No. 729-5117
BrandRS PRO
MYR455.22
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 831-5971
Mfr. Part No.E3S-DBP22 OMS
BrandOmron
MYR774.60
Each
units
Block Retroreflective 0 → 700 mm PNP 4-Pin M12 Connector - 30V Cable LED IP67, IP69 100 mA - 0.5 ms ABS, PBT
RS Stock No. 450-2948
Mfr. Part No.OBT200-18GM60-E5
MYR493.31
Each
units
Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 326-7240
Mfr. Part No.E3TSL132M
BrandOmron
MYR557.14
Each
units
Block Retroreflective 5 → 15 mm PNP Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 842-8585
Mfr. Part No.WTB2S-2P1360
BrandSick
MYR474.04
Each
units
Block Background Suppression 1 → 66 mm PNP 3-Wire Cable 2m - 30V - LED IP67 20 mA - 0.5 ms ABS/PC, Plastic
RS Stock No. 493-7322
Mfr. Part No.WF15-40B410
BrandSick
MYR811.28
Each
units
Fork Through Beam (Fork) 15 mm NPN/PNP 4-Pin M8 Connector - 30V - Infrared IP65 100 mA - 100 μs Aluminium
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
MYR821.38
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 818-1716
Mfr. Part No.EE-SX675
BrandOmron
MYR110.63
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 219-2397
Mfr. Part No.EE-SPY402 JPN
BrandOmron
MYR226.28
Each
units
Block Retroreflective 5 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 901-2780
Mfr. Part No.CX-422-P-J
BrandPanasonic
MYR464.13
Each
units
Block Diffuse Maximum of 800 mm PNP M12 Connector - 24V - Infrared IP67 - - 1 ms PBT
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
MYR702.10
Each
units
Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 45 mA - <0.49 ms ASA, PMMA
RS Stock No. 303-2195
Mfr. Part No.E3TSL212M
BrandOmron
MYR559.12
Each
units
Block Retroreflective 5 → 30 mm NPN Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 542-5145
Mfr. Part No.FPDK 20P 5101 S35A
BrandBaumer
MYR571.28
Each
units
Block Retroreflective 4.5 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <0.5 ms ABS, PBT
RS Stock No. 821-0066
Mfr. Part No.E3Z-T81-M1J-1 0.3M
BrandOmron
MYR504.06
Each
units
Block Through Beam (Emitter and Receiver) 15 m PNP Pre-Wired Cable - 24V Wire Lead Infrared IP67 35 mA - 1 ms PBT
RS Stock No. 842-3350
Mfr. Part No.Q60VR3AF2000
BrandBanner
MYR1,548.02
Each
units
Block Diffuse 200 → 2000 mm Relay Cable 250V 250V - LED IP67 50 mA - 15 ms ABS Polycarbonate
RS Stock No. 817-1554
Mfr. Part No.RL31-54/73c/136
MYR368.89
Each
units
Block Retroreflective 9000 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms Plastic
RS Stock No. 361-5526
Mfr. Part No.EX-13B-PN
BrandPanasonic
MYR481.77
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 488-132
Mfr. Part No.O5P200
MYR576.43
Each
units
Block Retroreflective 0.1 → 7 m PNP M12 Connector - 36V - LED IP67 200 mA - - Polyamide
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