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.


...
Voir plus Voir moins

Filtres

Afficher 1 - 20 des 243 produits
Nombre de résultats par page
Description Prix Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface
N° de stock RS 764-3907
Référence fabricantT18SP6DQ
MarqueBanner
99,62 €
Each
Unité
Barrel Diffuse 500 mm PNP 4-Pin M12 Connector - - 30V - - Infrared IP69K 150 mA -
N° de stock RS 847-9384
Référence fabricantQS18VP6LPQ8
MarqueBanner
107,49 €
Each
Unité
Barrel Retroreflective 3.5 m PNP 4-Pin M12 Connector - - 30V - - LED IP67 25 mA -
N° de stock RS 405-7280
Référence fabricantT30SP6RQ
MarqueBanner
93,52 €
Each
Unité
Barrel Through Beam (Receiver) 60 m PNP M12 Connector - - 30V - - Infrared IP69K 150 mA -
N° de stock RS 405-7375
Référence fabricantQS18VP6LP
MarqueBanner
84,29 €
Each
Unité
Block Retroreflective 3.5 m PNP 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
N° de stock RS 847-9312
Référence fabricantQS18VP6FF100Q8
MarqueBanner
120,92 €
Each
Unité
Barrel Diffuse 100 mm PNP 4-Pin M12 Connector - - 30V - - LED IP67 25 mA -
N° de stock RS 842-3127
Référence fabricantQ40SP6FF200Q
MarqueBanner
127,51 €
Each
Unité
Block Diffuse 200 mm PNP 4-Pin Connector - - 30V - - LED IP67, IP69K 35 mA -
N° de stock RS 265-9222
Référence fabricantT18SP6LPQ
MarqueBanner
117,60 €
Each
Unité
Barrel Retroreflective 50 mm → 2 m PNP M12 Connector - - 30V - - LED IP69K 150 mA -
N° de stock RS 405-7268
Référence fabricantT18SP6RQ
MarqueBanner
63,24 €
Each
Unité
Barrel Through Beam (Receiver) 20 m PNP M12 Connector - - 30V - - Infrared IP69K 150 mA -
N° de stock RS 847-9182
Référence fabricantQS18VN6FF100
MarqueBanner
110,28 €
Each
Unité
Barrel Diffuse 100 mm NPN Cable - - 30V - - LED IP67 25 mA -
N° de stock RS 842-2899
Référence fabricantQ12AB6FF30Q
MarqueBanner
110,58 €
Each
Unité
Block Diffuse 30 mm NPN/PNP Cable - - 30V - - LED IP67 20 mA -
N° de stock RS 860-1626
Référence fabricantSM312CV
MarqueBanner
187,58 €
Each
Unité
Block Convergent 16 mm NPN/PNP Cable - - 30V - - LED IP67 25 mA -
N° de stock RS 847-9426
Référence fabricantQS18VP6RQ8
MarqueBanner
89,96 €
Each
Unité
Barrel Through Beam (Receiver) 20 m PNP 4-Pin Connector - - 30V - - LED IP67 25 mA -
N° de stock RS 847-9075
Référence fabricantQS186EQ8
MarqueBanner
67,48 €
Each
Unité
Barrel Through Beam (Emitter) 20 m - 4-Pin M12 Connector - - 30V - - LED IP67 25 mA -
N° de stock RS 764-3900
Référence fabricantT186EQ
MarqueBanner
54,06 €
Each
Unité
Barrel Through Beam (Emitter) 20 m - 4-Pin M12 Connector - - 30V - - Infrared IP69K 150 mA -
N° de stock RS 847-9164
Référence fabricantQS18VN6D
MarqueBanner
105,62 €
Each
Unité
Barrel Diffuse 450 mm NPN Cable - - 30V - - LED IP67 25 mA -
N° de stock RS 847-9300
Référence fabricantQS18VP6FF100
MarqueBanner
101,25 €
Each
Unité
Barrel Diffuse 100 mm PNP Cable - - 30V - - LED IP67 25 mA -
N° de stock RS 842-3108
Référence fabricantQ25SP6FF100Q
MarqueBanner
127,51 €
Each
Unité
Block Diffuse 100 mm PNP 4-Pin M12 Connector - - 30V - - LED IP69K 35 mA -
N° de stock RS 847-9372
Référence fabricantQS18VP6LPQ5
MarqueBanner
104,61 €
Each
Unité
Barrel Retroreflective 3.5 m PNP 4-Pin Connector - - 30V - - LED IP67 25 mA -
N° de stock RS 842-3408
Référence fabricantQ85VR3LP-T9
MarqueBanner
175,22 €
Each
Unité
Block Retroreflective 80 mm → 4.6 m Relay Cable 240V - 240V - - LED IP67 - -
N° de stock RS 842-3329
Référence fabricantQ60BB6AF2000Q
MarqueBanner
217,28 €
Each
Unité
- - - NPN, PNP - - - - - - Infrared IP67 - -