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庫存編號 817-1560
製造零件編號RL31-8-2500-IR/73c/136
HK$610.69
單位
Block Diffuse 2500 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS庫存編號 450-2954
製造零件編號OBT200-18GM60-E5-V1
HK$777.61
單位
Barrel Diffuse 200 mm PNP 4-Pin M12 Connector - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS庫存編號 817-1557
製造零件編號RL31-8-1200-RT/73c/136
HK$625.69
單位
Block Diffuse 1200 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS庫存編號 450-2904
製造零件編號OBS4000-18GM60-E5
HK$849.58
單位
Barrel Retroreflective 4 m PNP Cable - 30V - LED IP67 100 mA - 1 ms Nickel Plated Brass
RS庫存編號 450-2897
製造零件編號OBS4000-18GM60-E4-V1
HK$849.58
單位
Barrel Retroreflective 4 m NPN 4-Pin M12 Connector - 30V - LED IP67 100 mA - 1 ms Nickel Plated Brass
RS庫存編號 124-0330
製造零件編號OBE20M-R101-S2EP-IO-V31-L
HK$1,140.43
單位
Block Through Beam (Emitter and Receiver) 0 20 m NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Connector Laser Light IP67, IP69, IP69K 100 mA IO-Link 0.4 ms PC
RS庫存編號 891-9514
製造零件編號RLK31-8-2500-IR/31/115
HK$579.71
單位
Block Diffuse 0 2500 mm Relay 5-Wire Cable 2m 240V 240V - Infrared IP67 40 mA - 25 ms PC
RS庫存編號 450-2948
製造零件編號OBT200-18GM60-E5
HK$777.61
單位
Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS庫存編號 510-3255
製造零件編號RLK29-55/25/116-SET
HK$964.52
單位
Block Retroreflective 12 m Relay 6-Terminal Screw 230V 230V - LED IP67 2 A - 50 ms ABS
RS庫存編號 714-1669
製造零件編號M100/MV100-RT/76a/95/103
HK$907.55
單位
Block Through Beam (Emitter and Receiver) 10 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PC
RS庫存編號 383-7669
製造零件編號KS11/KSE11/59/98A/102
HK$1,437.09
單位
Barrel Through Beam (Emitter and Receiver) 250 mm NPN 3-Pin M8 Connector - 30V - Infrared IP67 100 mA - <=3 ms Stainless Steel
RS庫存編號 817-1545
製造零件編號RL31-54/25/73c/136
HK$676.66
單位
Block Retroreflective 9000 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms Plastic
RS庫存編號 714-1638
製造零件編號ML100-8-1000-RT/95/102
HK$669.66
單位
Block Diffuse 1000 mm NPN 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PC
RS庫存編號 817-1551
製造零件編號RL31-8-2500-IR/59/73c/136
HK$610.69
單位
Block Diffuse 2500 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS庫存編號 780-0046
製造零件編號OBT50-R2-E2
HK$906.55
單位
Block Background Suppression 3 50 mm PNP - - 30V Cable LED IP67 50 mA - 600 μs ABS, ABT, PC
RS庫存編號 229-068
製造零件編號GD18/GV18/73/120
HK$629.68
單位
Barrel Through Beam (Emitter and Receiver) 20 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS庫存編號 714-1640
製造零件編號ML100-8-1000-RT/102/115
HK$669.66
單位
Block Diffuse 1000 mm NPN Cable - 30V - LED IP67 100 mA - 0.5 ms PC
RS庫存編號 891-9476
製造零件編號GLV18-8-H-120/115/120
HK$674.66
單位
Block Background Suppression 15 120 mm PNP 4-Wire Cable 2m - 30V - LED IP67 <15 mA - ≤1 ms PC
RS庫存編號 447-137
製造零件編號GL50-RT/32/40A/98A
HK$1,687.16
單位
Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - 1 ms Aluminium
RS庫存編號 297-5760
製造零件編號RLK39-8-2000-Z/31/40A/116
HK$2,110.94
單位
Block Diffuse 2000 mm Relay 4-Terminal Screw 240V 240V - Infrared LED IP67 3 A - <=20 ms PBT