Active infrared detector using principle and installation
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The principle and use of door magnetic detector
Wireless door magnets generally use power saving design. When the door is closed, it does not emit radio signals. At this time, the power consumption is only a few microamps. When the door is opened, it immediately emits a wireless alarm signal for about 1 second, and then stops automatically. At this time, even if the door is always open, it will not be fired again. This is to prevent the continuous emission of the transmitter causing the internal battery to be depleted and affect the alarm. The wireless door sensor is also designed with a battery low voltage detection circuit when the battery voltage is lower than 8 At the time of volt, the lower LP light-emitting diodes will light up. At this time, the A23 alarm battery must be replaced immediately. Otherwise, the reliability of the alarm will be affected.
The wireless door sensor is generally installed on the upper side or side of the inside of the door. It consists of two parts: the smaller part is a permanent magnet, and the inner one has a permanent magnet to generate a constant magnetic field. The larger one is a wireless door magnetic main body. It has a normally-open type reed pipe inside. When the permanent magnet and the reed switch are in close proximity (less than 5 mm), the wireless magnetic sensor is in working standby 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 containing the address code and its own identification code (ie, data code). The receiving board then determines whether the same alarm system is used by identifying the address code of the radio signal. According to its own identification code (ie, data code), it is determined which wireless door sensor alarm. The door magnetic detector is divided into wired and wireless according to the transmission mode; according to its installation mode, it is divided into inline and exterior, etc. Although the appearance is different, its principle and function are the same.
Utilizing a magnetic detector
The door magnetic detector is installed on the door of the room, the door is opened more than 1CM, the detector will inform the host to open the alarm and alarm;
Magnetic sensor installed on the window, the window was pulled more than 1CM, the detector will drive the host to open the alarm and alarm;
The door magnetic detector is installed on the drawer, the drawer is pulled more than 1CM, the detector will drive the host to open the alarm and alarm;
Internet cafes or offices install door magnetic detectors on computer cases or monitors. Someone opens the computer case or moves the monitor. The detectors will drive the host to open the alarm and alarm;
A thin copper wire is drawn from both ends of a reed switch (also known as a reed switch) in a door magnetic detector, and the thin copper wire is bundled or wound on an object to be protected, if an attempt is made to move the protected object. When the thin copper wire is disconnected, the host will open the siren and call the police;
In the actual use, we can find more ways to use according to the above tips...
Door magnetic detector installation method
Wireless door sensor installed in the active doors and windows, first wipe the corresponding position of the door, window, with double-sided adhesive; or remove the door and window magnetic detectors A, B each cover, fixed with screws, with screws , And then install the board. The following points should be noted in the installation of magnetic detectors for doors and windows: The wireless door magnetic detector A (transmitter) and the wireless door magnetic detector B (magnet) should be installed separately, ie, 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.
Magnets and emitters are centered up and down. The distance between the two should not exceed 10mm.
When the door magnetic detector used in other places, it can make flexible use <br> <br> installation prompts depending on the circumstances
If you purchase a wired door magnet, the installation method is basically the same. The only difference is that the output signal line of the wired door magnet can be connected to the host. For the door magnet, the signal output is generally not positive or negative, and it is directly connected to the input of the host computer. (Please refer to the host manual requirements). The appearance of the door magnetic detector manufacturers is not the same, but the principle and the use of the method is the same, as long as we pay attention to the wireless door magnetic transmission distance, to avoid the transmission distance is not enough.