E3SDBP21T Photoelectric sensor 4.5m
- availability: in stock
- Manufacturer: Omron
Photoelectric sensors , also called optical sensors, detect objects through a light beam. They are sensors that use energy transmission to detect transparent and opaque objects. They are made of a light source emitter and its receiver. The photoelectric sensor reacts to a change in the intensity of the light beam reaching it. It can be visible as well as infrared or laser, so the term photocell is often used for them. When the optical sensor has a built-in VR sensitivity regulator this allows for excellent detection performance.
Photoelectric sensors are often classified as proximity sensors, due to the similarity of their functions, such as detection, determination of features and condition of objects. The principle of operation differs in that they use energy transmission, not detection of field changes. Some photoelectric sensors have a built-in timer feature that allows time delay , power off or one time delay.
Thanks to their properties, photoelectric sensors are used on automated technological lines and in packaging machines. Unlike proximity sensors, they have a much longer service life and can be used in places where it is not possible to use mechanical sensors.
The most common application is the detection of a foreign body in a certain area. The device then acts as a photo switch. We find photoelectric sensors in the engineering, automotive, pharmaceutical, food and many other industries. The use of photoelectric sensors allows for more precise work, e.g. accurate positioning in steel processing .
The basic principle of a photoelectric sensor is to detect objects through a beam of light emitted by the transmitter, incident on the photosensitive element of the receiver. The sensor is connected with a light source (often integrated in one housing) which is a transmitter. When any object is in the optical path between the transmitter and the receiver, the light intensity changes.
Different types of sensors are available depending on the application. The most frequently used are:
Photoelectric sensors can be differentiated according to their operating logic: NO (Normally Open) or NC (Normally Close).
The sensors are selected according to the working conditions and we follow:
An important criterion is the type of object (or objects) to be detected. Some photoelectric sensors even react to transparent films. Others, in turn, require almost complete opacity of the object. You should choose a model with a sensitivity adjustment potentiometer. This will allow you to precisely set the sensor threshold.