Photoelectric switch sensor is the abbreviation of photoelectric proximity switch. It uses the shielding or reflection of the light beam by the detected object, and the gate circuit of the synchronous loop is used to detect the presence or absence of the object. Objects are not limited to metals, all objects that can reflect light can be detected. The photoelectric switch sensor converts the input current into a light signal on the transmitter, and then the receiver detects the target object according to the intensity or presence of the received light. The common photoelectric switch sensor smoke alarm in the security system is often used in the industry to count the number of movements of the robotic arm.

The photoelectric switch sensor is a member of the sensor family. It converts the change in the intensity of light between the transmitting end and the receiving end into a change in current to achieve the purpose of detection. Since the output circuit and input circuit of the photoelectric switch sensor are electrically isolated (ie, electrical insulation), it can be used in many occasions. The photoelectric switch sensor is a new generation of photoelectric switch sensor devices manufactured by using integrated circuit technology and SMT surface mounting technology. It has intelligent functions such as delay, widening, external synchronization, anti-interference, high reliability, stable working area and self-diagnosis. This novel photoelectric switch sensor is an active photoelectric detection system electronic switch that uses pulse modulation. The cold light source it uses includes infrared light, red light, green light, and blue light. It can be contactless and damage-free. Quickly and control the state and action of various solid, liquid, transparent, black, soft, smoke and other substances.
The contact type travel switch has the disadvantages of low response speed, poor accuracy, easy damage to the detected object and short life span in contact detection, while the transistor proximity switch has a short operating distance and cannot directly detect non-metallic materials. However, the new photoelectric switch sensor overcomes their above-mentioned shortcomings, and is small in size, multi-functional, long-life, high-precision, fast response, long detection distance, and strong resistance to light, electrical, and magnetic interference.
This new type of photoelectric switch sensor has been used for level detection, level control, product counting, width discrimination, speed detection, fixed-length cutting, hole recognition, signal delay, automatic door sensing, color mark detection, punching And shears and safety protection and many other fields. In addition, the use of infrared concealment can also be used as an anti-theft warning in banks, warehouses, shops, offices and other occasions where it is needed.