The elevator will often open again when there is a foreign object in the elevator to cover the door. The opening and closing of the floor door and locking is to ensure that the elevator operates in the first condition, only the elevator locking elevator will run which protects the elevator door from closing when the elevator does not appear to run vertically, and secondly, the elevator is equipped with safety sensing devices such as safety touch panel or infrared light curtain and other sensing devices to ensure that the elevator door in the presence of a foreign body when opened again, this system ensures that the elevator to prevent the clamping of people.

A safety light curtain is a kind of anti-intrusion detection with safety devices, commonly used in industrial automation production and safety manufacturing, but also in the life of some special environment is useful. For example, the elevator, but in the elevator generally used safety of light curtain belongs to the ordinary type of light curtain, while the industry is more often uses with a certain level of safety safety light curtain. Safety light curtains utilize the principle of photoelectric sensing to work and usually consist of multiple pairs of infrared sensors with transmitting and receiving functions to form the physical part of its detection.

Elevator Light Curtain Working Principle

An elevator light curtain is a kind of light-type elevator door safety protection device, applicable to passenger elevators, and freight elevators, to protect the safety of passengers. Elevator safety light curtain practical applications do not need a controller, only transmitters and receivers, when used through the aviation plug socket or cable connection, the output can be directly connected to external relays or various types of computer digital interface.

Safety light curtains to detect objects (such as hands) into the test principle structure, the light curtain on one side of the equally spaced installation of several infrared transmitting tubes, the other side of the corresponding number of the same arrangement of infrared receiving tubes, each infrared transmitting tubes correspond to a corresponding infrared receiving tube and is installed in the same straight line. Under the control of the MCU, the transmitter-receiver tubes are turned on sequentially, scanning the door area continuously from top to bottom, forming a dense infrared protection light curtain.

When there is no obstacle between the infrared transmitter tube and the infrared receiver tube on the same straight line, the modulation signal (light signal) from the infrared transmitter tube can reach the infrared receiver tube smoothly.

The infrared receiver tube receives the modulation signal, and the corresponding internal circuit outputs low level, while in the case of obstacles, the modulation signal issued by the infrared transmitter tube (light signal) can not reach the infrared receiver tube, then the infrared receiver tube can not receive the modulation signal, the corresponding internal circuit output is high level.

When there is no object through the light curtain, all the modulation signals (light signals) from the infrared transmitter tube can reach the corresponding infrared receiver tube on the other side, so that all the internal circuit output is low, by analyzing the state of the internal circuit can be detected by the presence or absence of the object information. When any of the light is blocked, the control system immediately outputs the open signal, and the car door stops closing and reverse open, until the passengers or blocking objects out of the warning area of the elevator door can be closed normally, to achieve the purpose of safety protection, to avoid elevator pinch accidents.

LSE Series Economic Light Curtain Features: 

（1）Easy mounting 
Optical synchronous communication makes the wiring and mounting easy.
（2）Strong light resistance
Special optical design to effectively eliminate light interference.
（3）Slim shape 
Ultra-thin design, suitable for installation in limited space.
（4）High-cost performance
Optimize production process and material cost to provide cost-effective products.
（5）Integrated molding
Integrated molding process increases waterproof performance.IP67 protection rating ensures outdoor application.

Hope the above information can help you choose the right Elevator light curtain. If you are still not sure which product to choose, you can also contact us by email. G-TEK has the most professional technical service team and sales service team to provide you with the most professional sensor product solutions.