The sensing door refers to a door that opens automatically when anyone or an object approaches. How does the sensing door recognize people or objects, and what is the underlying principle? In fact, the opening signal of the sensing door is a contact signal, and microwave radar and infrared sensors are two commonly used signal sources. Microwave radar reacts to the position of objects, making it suitable for areas where people walk quickly or at a normal pace. Its characteristic is that once a person near the door does not want to exit and remains still, the radar will not respond, and the automatic door will close, serving a maintenance function for the door.

　　The infrared sensor stops responding to objects, regardless of whether a person is moving. As long as they are within the scanning range of the sensor, it will react and emit a contact signal. The drawback is that the infrared sensor has a slow response speed, making it suitable for areas where people move slowly.

　　Additionally, if the sensing door receives a contact signal for too long, the controller may interfere with the signal input system. Moreover, even if the automatic moving door is open for too long, it can be harmful to the electrical components. Microwave radar and infrared sensors do not understand whether a person approaching the automatic door can actually enter, which is why some places tend to use key switches.

　　The button switch is a capacitive button known as an elbow touch switch. The elbow touch switch is very useful and can be operated with the elbow. There are also foot-operated switches, but they require high waterproof standards and can be easily rendered ineffective due to the force applied by the foot. Additionally, there is a handle that provides a contact signal for the door machine when pushed into position (or pulled in the opposite direction).

    Nowadays, building automation sometimes presents other requirements, such as using a Tel line to open the door. To meet this requirement, the signal should be a passive contact signal.

    Considerations for purchasing automatic sensing doors

　　1. Pay attention to sensor sensitivity

　　When purchasing automatic sensing doors, it is essential to focus on the sensitivity of the sensors, especially in areas like hotels and office buildings where the volume of claims is relatively high and automatic sensors are frequently used. Therefore, it is recommended to choose high-sensitivity sensors. Banks or stores located along sidewalks can use narrow area sensors to prevent false detections.

　　2. Confirm whether there are safety auxiliary devices

　　Safety issues are something we cannot overlook when purchasing automatic sensing doors. To avoid accidents involving people getting caught, it is important to check whether there are infrared safety auxiliary devices when buying automatic sensing doors. Installing such devices can effectively prevent such situations.

　　3. Check for a backup power supply

　　Power outages are also events we frequently experience. Since sensing doors cannot open without power, it is important to carefully observe whether there is a power supply when purchasing, so that the sensing door can function normally even during a power outage.