Photoelectric Sensors | Optical Sensor | RS Components
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    Photoelectric Sensors

    What are Photoelectric Sensors?

    Photoelectric sensors determine the distance, absence, or presence of physical objects by emitting a field or beam of electromagnetic radiation. An object is detected by measuring alterations in the return signal, this is achieved as sensors have an Emitter for emitting light and a Receiver for receiving light. There are 3 main types of photoelectric sensors, through-beam, retro-reflective and diffuse, which vary slightly in the way they function.

    The basic function of each is to detect the presence or absence of objects or measure the distance to the object. You can learn more in our complete guide to photoelectric sensors.

    Types of Photoelectric Sensors:

    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 can detect 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 must 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 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.

    Applications of Photoelectric Sensors

    Photoelectric Sensors can be used in various settings, some of which include:

    • Food Industry
    • Pharmaceutical Industry
    • Packaging Plants
    • Automotive Industry
    • Doors & Gates

    Browse the broad range of Photoelectric Sensors RS Components have to offer and order today for next day delivery.

    5732 표시되는 제품 Photoelectric Sensors

    Omron
    Compact
    Diffuse with Background Suppression
    10 mm → 80 mm
    NPN
    M8 Connector
    -
    -
    IO-LINK
    30V
    M8 Connector
    LED
    IP67, IP67G, IP69K
    35 mA
    IO-Link
    1 ms
    -
    Stainless Steel SUS316L
    +55°C
    -25°C
    -
    E3AS-L
    SICK
    Block
    Retroreflective
    4.5 m
    PNP
    M8 4 Pin Connector
    Dark Switching
    -
    -
    30V
    4 Pin Connector
    Laser Light
    IP66, IP67, IP68, IP69K
    100 mA
    -
    0.5 ms
    -
    Stainless Steel, Stainless Steel V4A
    +50°C
    -10°C
    Threaded
    W4SLG-3H
    Omron
    Block
    Retro-Reflective
    4 m
    Relay
    Terminal Block
    Light / Dark switching
    240V
    -
    240V
    -
    LED
    IP66
    3 A
    -
    30 ms
    -
    ABS
    +55°C
    -25°C
    Flange Mount
    E3JM
    Banner
    Rectangular
    Opposed
    60 m
    NPN/PNP
    Integral QD
    Light / Dark switching
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    SICK
    Block
    Retroreflective
    6 m
    PNP
    Cable with connector
    -
    -
    -
    30V
    4 Pin Connector
    PinPoint LED
    IP67
    -
    -
    650 μs
    -
    Plastic
    +55°C
    -25°C
    -
    G6
    SICK
    Barrel
    Retroreflective
    60 mm → 6 m
    PNP
    M12 4 Pin Connector
    -
    -
    -
    30V
    M12 Connector
    LED
    IP67
    30 mA
    -
    <500 μs
    -
    ABS, Brass, Metal
    +55°C
    -25°C
    Threaded
    GR18S
    SICK
    Block
    Retroreflective
    0.08 → 12 m
    PNP
    M12 4 Pin Connector
    Light / Dark switching
    -
    -
    30V
    4 Pin Connector
    Laser Light
    IP65
    100 mA
    -
    0.25 ms
    -
    ABS/PC/POM, Plastic
    +50°C
    -10°C
    Flange Mount
    W100
    SICK
    Fork
    Fork Sensor
    2.6 mm
    PNP/NPN
    M12 Connector
    Light / Dark switching
    -
    IO-LINK
    30V
    M12 Connector
    -
    IP65
    100 mA
    IO-Link
    440 μs
    -
    Glass Fiber Reinforced Plastic, Metal, Plastic, Zamak
    +55°C
    -5°C
    -
    UFS3
    Panasonic
    Fork
    Through Beam
    6 mm
    PNP
    Cable 3 m
    -
    -
    -
    24V
    Cable
    Infrared
    IP64
    50 mA
    -
    20 μs, 80 μs
    -
    PBT (Enclosure), Polycarbonate (Display Section)
    +55°C
    -25°C
    Chassis Mount
    PM-45
    SICK
    Miniature
    Through Beam
    10 m
    PNP/NPN
    3-pin connector, M8
    Light / Dark switching
    -
    -
    30V
    M8 Connector
    LED
    IP66, IP67
    25 mA
    -
    = 500 μs
    UL
    Plastic
    +60°C
    -40°C
    Wall Mount
    WSE4FP
    Telemecanique Sensors
    Compact
    Retroreflective
    5 m
    PNP
    4-Pin M12 Connector
    -
    -
    -
    24V
    -
    LED
    IP65
    100 mA
    -
    <2 ms
    -
    PBT
    +55°C
    -25°C
    -
    -
    Banner
    Block
    Background Suppression
    100-1000 mm
    NPN/PNP, Analog 0-10V
    M12 Connector
    Light, Dark and Window switching
    -
    -
    12 - 30V
    M12 Connector
    Laser Red
    IP67
    -
    -
    1 ms
    -
    Die-Cast Zinc
    +55°C
    -20°C
    Flat Mount
    LE
    SICK
    Block
    Energetic
    250 mm → 300 mm
    Light/Dark Switching, NPN
    M8 Connector
    -
    -
    -
    30V
    4 Pin Connector
    -
    IP67
    100 mA
    -
    0.00125 seconds
    -
    Plastic
    +55°C
    -25°C
    -
    G6
    SICK
    Barrel
    Background Suppression
    3 mm → 300 mm
    PNP
    Cable
    -
    -
    -
    30V
    4 Wire
    Red Light
    IP67
    100 mA
    -
    0.0005 seconds
    -
    Metal
    +55°C
    -25°C
    -
    GR18S
    SICK
    Long Distance
    Distance
    0.15 → 100 m
    Digital
    M12 Male Connector
    Light Switching
    -
    Profinet
    30V
    M12 Male Connector
    Laser Light
    IP65
    100 mA
    PROFINET
    2 ms
    -
    Die Cast Aluminium
    +55°C
    -40°C
    Panel Mount
    Dx100
    Omron
    Block
    Background Suppression
    35 mm → 500 mm
    NPN
    Pre-Wired Cable
    -
    -
    IO-LINK
    -
    Cable
    LED
    -
    -
    -
    -
    -
    Stainless Steel
    -
    -
    -
    E3AS
    Telemecanique Sensors
    Barrel
    Diffuse
    0.1 m
    PNP
    4-Pin M12 Connector
    -
    -
    -
    24V
    -
    Infrared
    IP65, IP67
    100 mA
    -
    <1 ms
    -
    PBT
    +55°C
    -25°C
    -
    -
    SICK
    Block
    Background Suppression
    4 mm → 120 mm
    PNP
    M8 Connector with cable
    -
    -
    -
    30V
    3 Pin Connector
    Red Light
    IP66, IP67
    100 mA
    -
    0.0005 seconds
    -
    Plastic
    +60°C
    -40 °C
    -
    W4S-3
    Banner
    Rectangular
    Retroreflective
    5 m
    PNP
    Cable
    Light / Dark switching
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Omron
    Block
    Diffuse
    700 mm
    NPN/PNP
    Pre-Wired Cable
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    E3S-C
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