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 Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
New
RS Stock No. 201-0798
Mfr. Part No.MPF2-912RSL
TWD3,477.00
Each
units
Barrel Through Beam 15 m Relay Screw Terminal - - - - - - - - -
RS Stock No. 859-3024
Mfr. Part No.ET1820PPAS-1
TWD4,231.00
Each
units
Barrel Through Beam (Receiver) 20 m PNP M12 Connector - - 40V M12 LED IP67 12 mA - 1.6 (ON) ms, 4.2 (OFF) ms
New
RS Stock No. 201-0799
Mfr. Part No.PA18CLD01TC
TWD2,368.00
Each
units
Barrel Diffuse 100 mm SCR Cable - - - - - - - - -
New
RS Stock No. 201-0809
Mfr. Part No.PE12CNT15NO
TWD1,685.00
Each
units
Barrel Through-Beam 1.5 m NPN, PNP Cable - - - - - - - - -
New
RS Stock No. 201-0800
Mfr. Part No.PA3PNPA
TWD6,997.00
Each
units
Rectangular Retroreflective 3 m NPN Cable - - - - - - - - -
New
RS Stock No. 201-0810
Mfr. Part No.PE12CNT15PO-15M
TWD2,506.00
Each
units
Barrel Through-Beam 1.5 m NPN, PNP Cable - - - - - - - - -
RS Stock No. 188-5211
Mfr. Part No.PA18CAT20M1
TWD863.00
Each
units
Miniature Through-Beam 20 m - M12 x 4 Pin Connector - - 30V M12 LED IP67, IP69K 25 mA - 1 (On-Off) ms
New
RS Stock No. 201-0801
Mfr. Part No.PB18CNT15
TWD1,463.00
Each
units
Barrel Through-Beam 15 m NPN, PNP Cable - - - - - - - - -
RS Stock No. 188-5203
Mfr. Part No.PD30ETD10PAM5SA
TWD3,076.00
Each
units
Miniature Diffuse-Reflective 1 m PNP NO/NC M8 x 4 Pin Connector - - 30V M8 LED IP68, IP69K 25 mA - 0.5 (On-Off) ms
New
RS Stock No. 201-0803
Mfr. Part No.PD112CNB25BPM1
TWD5,906.00
Each
units
Rectangular Retroreflective 500 → 2500 mm NPN Plug - - - - - - - - -
RS Stock No. 188-5200
Mfr. Part No.PD30CTB20PAIS
TWD1,949.00
Each
units
Miniature Diffuse-Reflective 200 mm PNP NO/NC Cable - - 30V Cable - IP67 40 mA - 1 (On-Off) ms
RS Stock No. 857-7848
Mfr. Part No.PA18CAD10NAM1SA
TWD2,689.00
Each
units
Barrel Diffuse 1 m NPN/PNP M12 Connector - - 30V M12 LED IP66, IP69K <20 mA - >1 ms
New
RS Stock No. 201-0793
Mfr. Part No.MPFR-4
TWD1,525.00
Each
units
Barrel Through Beam 15 m Relay Screw Terminal - - - - - - - - -
RS Stock No. 188-5221
Mfr. Part No.PC50CNT20BAM1
TWD2,956.00
Each
units
Block Through-Beam 20 m PNP/NPN NO/NC M12 x 1 Connector - - 30V M12 - IP67 50 mA - 1 (On-Off) ms
New
RS Stock No. 201-0804
Mfr. Part No.PD140FNT60QMU-02C
TWD5,144.00
Each
units
Block Through-Beam 60 m Relay Screw Terminal - - - - - - - - -
RS Stock No. 188-5202
Mfr. Part No.PD30ETR60PAM5SA
TWD3,230.00
Each
units
Miniature Retro-Reflective 6 m PNP NO/NC M8 x 4 Pin Connector - - 30V M8 - IP68, IP69K 25 mA - 0.5 (On-Off) ms
New
RS Stock No. 201-0811
Mfr. Part No.PMD8RG
TWD5,304.00
Each
units
Block Diffuse 800 mm NC, NO Screw Terminal - - - - - - - - -
New
RS Stock No. 201-0794
Mfr. Part No.MPFR-4-25M
TWD1,728.00
Each
units
Barrel Through Beam 25 m Relay Screw Terminal - - - - - - - - -
RS Stock No. 859-3301
Mfr. Part No.MOFT20-M12-5
TWD6,492.00
Each
units
Barrel Through Beam (Emitter) 20 m NPN/PNP Cable - - 3V - LED IP66, IP67 15 mA - -
RS Stock No. 188-5204
Mfr. Part No.PD30ETB20PAM5SA
TWD3,915.00
Each
units
Miniature Diffuse-Reflective 200 mm PNP NO/NC M8 x 4 Pin Connector - - 30V M8 - IP68, IP69K 40 mA - 1 (On-Off) ms