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What sensor does the automatic sensor door use?

April 07 , 2022

There are two main types of sensors for Automatic door opener, microwave sensors and infrared sensors.


1. Microwave sensor


      Microwave sensors, also known as "microwave radars", can respond to the movement of objects. Because the response speed of the microwave sensor is fast, it is very suitable for places where people with normal walking speeds pass through.

      However, the microwave sensor also has certain disadvantages, that is, once the people near the door do not want to go out and stay still, the radar will no longer respond, and the automatic door will be closed, so people may be trapped.

Microwave Sensor

2. Infrared sensor


      Infrared sensors sense certain characteristics of the surrounding environment by emitting or detecting infrared radiation, can measure the heat emitted by objects, and detect motion.

      The characteristic of the infrared sensor automatic sensing door is that no matter whether the person moves or not, it will respond as long as it is within the safe range of the sensor. However, the response speed of infrared sensors is slower than that of microwave sensors.

      The automatic door opener is mainly composed of the main controller, the induction detector, the powerful motor, the door leaf travel track, the door leaf spreader wheel system, the synchronous belt, the lower guide system, and the induction door operator, and other components. 

 Infrared Sensor

So what is the working principle of the automatic door sensor? 


1. The Automatic door opener is equipped with a microwave sensor or an infrared sensor. When the sensor detects that someone has entered, it will transmit a pulse signal to the main controller. After the main controller judges, it will notify the motor to run, and monitor the motor revolutions at the same time. Notifies the motor to add force and enter slow running at a certain time.


2. After the motor gets a certain running current, it will run forward, transmit the power to the synchronous belt, and then the synchronous belt will transmit the power to the spreader system to open the door leaf; after the door leaf is opened, the controller will make a judgment, and notify the motor if the door needs to be closed. Do the opposite movement to close the door.


3. During the use of the automatic door opener, it is necessary to regularly clean the oil, dust, etc. inside the chassis to prevent the automatic door from malfunctioning.

Automatic Door Operator


Author: Written by Ms.Anna Zhang from S4A INDUSTRIAL CO., LIMITED


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