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The principle and daily maintenance of the wireless door magnetic sensor

250 Published by xia, Crystal May 10,2019

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The wireless door magnetic sensor is used to monitor the opened and closed state of the door. When the door is opened for whatever reason, the wireless door magnetic sensor immediately transmits a specific radio wave and sends an alarm signal to the host from a long distance. The wireless door alarm signal can transmit 150 meters in open areas and 20-50 meters in general residential homes, because the wireless door magnetic sensor transmission distance is closely related to the surrounding environment.

Principle and use of wireless door magnetic sensor

Wireless door magnetic sensor

Wireless door magnets generally use a power-saving design. When the door is closed, it does not transmit radio signals. At this time, the power consumption is only a few microamps. When the door is open, the wireless alarm signal is immediately transmitted for about 1 second and then automatically stopped. At this time, even if the door is always open, it will not ignite again. This is to prevent the internal battery from being exhausted due to continuous transmitter emissions, which can affect the alarm. The wireless door magnet is also designed with a battery low voltage detection circuit. When the battery voltage is below 8 volts, the lower LP LED will illuminate. In this case, the special battery of the alarm should be replaced immediately, otherwise the reliability of the alarm will be affected.

The wireless door magnetic sensor is generally mounted on the upper side or the side of the door. It consists of two parts: the smaller part is a permanent magnet, the inside has a permanent magnet to generate a constant magnetic field, and the larger is the wireless magnetic body. It has a normally open reed switch inside. When the permanent magnet and the reed switch are close together (less than 5 mm), the wireless door magnetic sensor is in the working state. When the permanent magnet leaves the reed pipe for a certain distance. The wireless magnetic sensor immediately transmits a 315 MHz high frequency radio signal including an address code and a self identification code (that is, a data code), and the receiving board determines whether the same alarm system is by identifying the address code of the radio signal, and then based on the own identification code (ie, the data code), it is determined which wireless door magnetic alarm. The door magnetic detector is divided into wired and wireless according to the transmission mode; it is divided into embedded and externally installed according to its installation mode, although the appearance is different, but the principle and effect are the same.

Effective use of door magnetic detectors

The door magnetic detector is installed on the door, the door is opened more than 1CM, the detector will inform the host to open the alarm;

The door magnetic detector is installed on the window, the window is pulled more than 1CM, and the detector will drive the host to open the alarm;

The door magnetic detector is installed on the drawer, the drawer is pulled more than 1CM, and the detector will drive the host to open the alarm;

The Internet cafe or office installs the door magnetic detector on the computer case or display. When someone opens the computer case or moves the display, the detector will drive the host to turn on the alarm;

A thin copper wire is connected from both ends of the reed switch (also called a reed pipe) in the door magnetic detector to bundle or wrap the thin copper wire on the object to be protected if someone attempts to move the protected object. When the thin copper wire is disconnected, the host will turn on the siren and alarm;

In actual use, you can find more ways to use according to the above tips.

Door magnetic detector installation method

The wireless door magnetic sensor is installed on the movable door and window. Firstly, wipe the corresponding position of the door and window, and use double-sided tape to fix it; or remove the cover of each of the door and window magnetic detectors A and B, fix it with screws and fix it with screws. Reload the board. Door and window magnetic detector installation should pay attention to the following points: wireless door detector A (transmitter) and wireless door detector B (magnet) should be installed separately, that is, the transmitter is installed on a fixed door frame or window frame, and the magnet should be installed on the active doors and windows.

The magnet and the emitter are centered up and down, and the distance between the two should not exceed 10 mm.

When the door magnetic detector is used in other places, you can use it according to the specific situation.

Installation tips

If you buy a wired door magnetic sensor, the installation method is basically the same. The only difference is that the output signal line of the wired door magnetic sensor can be connected to the host. For the door magnetic sensor, the signal output generally does not distinguish between positive and negative, and is directly connected to the input end of the host. (Refer to the instructions). The appearance of the door magnetic detectors varies from manufacturer to manufacturer, but the principle and method of use are the same. You only need to pay attention to the transmission distance of the wireless door magnetic sensor.

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