Door magnetic switch installation and common fault introduction

China Security Network Xiaobian This article is to introduce you to the installation of the magnetic switch and the introduction of common faults.

Principle of magnetic switch

The magnetic switch is generally designed to save power. 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 opened, it immediately transmits a wireless alarm signal for about 1 second, and then stops by itself. At this time, even if the door is always open, it will not be fired again. This is to prevent the internal battery from running out due to continuous transmitter emission, which affects the alarm. The wireless door magnet is also designed with a battery low voltage detection circuit. When the battery voltage is lower than 8 At the time of volts, the LP LED below will illuminate. In this case, the A23 alarm battery must be replaced immediately, otherwise the reliability of the alarm will be affected. The wireless 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 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, and although its appearance is different, its principle and effect are the same.

Door magnetic switch installation

The magnetic switch detector is installed on the movable door and window. Firstly, clean the corresponding position of the door and window, and stick it with double-sided tape. Or remove the cover of each of the magnetic detectors A and B of the door and window, fix it with screws and fix it with screws. , then install the board. The door and window magnetic detector installation should pay attention to the following points: the wireless door detector A (transmitter) and the wireless door detector B (magnet) should be installed separately, that is, the transmitter is mounted on a fixed door frame or window frame, and the magnet It should be installed on the active doors and windows.

Common faults of magnetic switches

A, the host can not receive the alarm signal of the door magnet (1) check whether the door magnet IC code is correct (2) check the distance between the door magnet and the host (3) check whether the battery has electricity or the battery button connection is paragraph (4) Check the surrounding environment where the door magnet is installed. (5) Check if the circuit board of the door magnet is damaged. B. The indicator light of the door magnet is not bright or long. (1) Check if the solder joints on the board are loose or loose. 2) Check the battery power (3) Check the circuit board for damage C, install the transmitter on the door frame as much as possible, and mount the magnet on the door to reduce the vibration of the transmitter.

Application of magnetic switch

Magnetic switches are widely used in measuring instruments, office automation equipment, household goods, security and safety equipment, and transportation equipment.