In recent years, a number of incidents have occurred around the world in which passengers blocked elevator doors for a long period of time with thin objects such as wooden boards, iron plates, and tiles. The elevator started the forced closing function, resulting in serious damage to the floor door (car door), and door machine system of the accident. Condemn such uncivilized use of the elevator behavior at the same time, as elevator manufacturers and suppliers must also be the elevator door anti-clamping protection device as well as the forced closing protection function re-improvement. So how should we pick the elevator door anti-pinch sensor?

We all know that the elevator door is equipped with a protective device, when there is an object blocking the elevator door closure, the elevator door will automatically open. But many people do not know the principle, sometimes blindly blocking the elevator door closing instead will lead to dangerous situations. There are three main types of elevator door protection devices: touch plate elevator door, light curtain elevator door, and light curtain touch plate integrated elevator door, the principles of these three types of elevator door protection devices are also different.

Touch plate elevator door: with a kind of electromechanical integrated door closing anti-pinch safety protection device, protected by a protruding movable contact plate, when the two elevator doors are running in the process of the movable contact plate contacting the object or human body and applying a certain amount of resistance, it triggers the electrical switch action of the contact plate, controlling the elevator door to stop closing and open in the opposite direction.
Note: If a soft object (e.g. rope, skirt, scarf, etc.) is caught by the elevator door, the resistance of the object is small, and it will not necessarily trigger the electrical switch of the contact plate, that is to say, the contact plate type elevator door protection device will sometimes be "ineffective".

Light curtain elevator door: The elevator light curtain installed on both sides of the elevator car door by the infrared transmitter and receiver, installed on the roof of the power box and special flexible cable four major components, forming a dense infrared protection light curtain, when the person or object through the light curtain, will block the receiver to receive infrared light, triggering the electrical switch action to control the elevator door to stop closing and reverse open, to avoid pinching the passenger.

Light curtain and touch plate two-in-one elevator door: both light curtain and touch plate two kinds of protection device function, can rely on infrared sensing, also can rely on contact and apply resistance to block the door closing.
Note: Although this two-in-one protection device is more comprehensive, there is still a certain "blind spot" position, the market light curtain elevator in the door at the bottom of the blind spot of ten centimeters, touch plate elevator can not cover the entire range.
 

Application: 

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     

PT12T/V Miniature Counterpoise Sensor Features
1. Compact design and mini shape make it easier to install in miniaturized equipment.
2. The "snap" design and 45° exit mode allow for quick mounting in 12.5-13.5 mm diameter mounting holes
3. The secondary safety circuit is designed for the fault detection of the sensor. A high level of safety protection is designed to reduce accidents for your gates.
4.IP65 grade protective shell design, epoxy resin seal suitable for harsh environment.
5. 10m detection distance, to meet the need of turnstile gate induction distance. 
Optical cells provide accurate pedestrian detection for your brakes.

I hope the above information can help you select the appropriate sensor protection products for your elevator door. If you are still not sure which guard 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.