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 847-0331
製造零件編號13104RQD07
BrandEaton
HK$1,492.60
單位
Block Diffuse Maximum of 50 mm NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms Polyurethane
RS庫存編號 847-0236
製造零件編號11102AQD07
BrandEaton
HK$988.51
單位
Block Through Beam (Emitter) Maximum of 24 m NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 3.5 ms Polyurethane
RS庫存編號 847-0343
製造零件編號13105AQD07
BrandEaton
HK$1,492.60
單位
Block Diffuse Maximum of 50 mm NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms Polyurethane
RS庫存編號 847-0766
製造零件編號E65-SMTS15-HA
BrandEaton
HK$637.11
單位
Block Through Beam (Emitter) Maximum of 15 m NPN/PNP Cable - 30V - LED IP68 100 mA - 1 ms Cycoloy
RS庫存編號 847-0700
製造零件編號E65-SMPP050-HL
BrandEaton
HK$859.39
單位
Block Diffuse Maximum of 50 mm NPN, PNP Cable - 30V - LED IP68 100 mA - 1 ms Cycoloy
RS庫存編號 847-0319
製造零件編號13104A6517
BrandEaton
HK$1,319.52
單位
Block Diffuse Maximum of 50 mm NPN/PNP Cable - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms Polyurethane
RS庫存編號 847-0249
製造零件編號12100AQD07
BrandEaton
HK$1,093.18
單位
Block Through Beam (Receiver) Maximum of 6 m NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 3.5 ms Polyurethane
RS庫存編號 847-0371
製造零件編號13108AQD07
BrandEaton
HK$1,492.60
單位
Block Diffuse Maximum of 150 mm NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms Polyurethane
RS庫存編號 847-0567
製造零件編號E58-18DP100-HL
BrandEaton
HK$2,909.62
單位
Barrel Diffuse Maximum of 100 mm NPN/PNP Cable - 30V - LED - 250 mA - 1 ms Stainless Steel
RS庫存編號 847-0261
製造零件編號13100A6517
BrandEaton
HK$1,109.82
單位
Block Diffuse Maximum of 610 mm NPN/PNP Cable - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms Polyurethane
RS庫存編號 847-0255
製造零件編號12102A6517
BrandEaton
HK$1,174.53
單位
Block Through Beam (Receiver) Maximum of 24 m NPN/PNP Cable - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 3.5 ms Polyurethane
RS庫存編號 847-0252
製造零件編號12102AQD07
BrandEaton
HK$1,310.31
單位
Block Through Beam (Receiver) Maximum of 24 m NPN/PNP 4-Pin Connector - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 3.5 ms Polyurethane