Wireless door magnetism uses the design that omit report commonly, when the door is shut it does not transmit radio signal, right now bad news report has a few microamper only, when the instant that the door is opened, transmit the wireless alarm signal that 1 second controls instantly, stop by oneself next, calculate the door to be opened all the time at this moment also won't blast off again, this is to prevent catapult to blast off continuously cause in-house batteries n extinct and the influence calls the police, wireless door magnetism returns a design to batteries low voltage detects circuit, the voltage when batteries is low at 8 bend over, the LP glow diode of lower part can illume, need to change instantly at this moment A23 warning apparatus is special batteries, can affect the reliability that call the police otherwise.
Sensor of wireless door magnetism installs the upper part in door inside or edge to go up commonly, it divides composition by two: Minor part is permanent magnet, interior has a permanent magnet, use the magnetic field with constant generation, bigger is main body of wireless door magnetism, its interior has to often leave model canal striking spring, when leaning very nearly with canal striking spring when permanent magnet (be less than 5 millimeter) , sensor of wireless door magnetism is in working expect condition, it is certain to leave valve striking spring when permanent magnet after the distance, sensor of wireless door magnetism blasts off instantly include address encode and oneself identification code (namely data is piled up) the signal of high frequency radio of 315MHZ, receive board whether is passing the address code that identifies this radio signal to judge namely same call the police of the system, next according to oneself identification code (namely data is piled up) , it is magnetism of which wireless door calls the police certainly. Door magnetism detector is by transmission means cent wired and wireless two kinds; By its installation means cent is inside embed the outfit outside mixing to wait a moment, although the exterior is different, its principle and function are same. 　 Use door magnetism detector alive: Installation of door magnetism detector is on the door, the door is opened to exceed 1CM, detector can inform lead plane is opened alarm date calls the police;
Installation of door magnetism detector is on the window, the window is pulled open to exceed 1CM, detector is opened with respect to meeting drive lead plane alarm date calls the police;
Install door magnetism detector on the drawer, the drawer is pulled open to exceed 1CM, detector is opened with respect to meeting drive lead plane alarm date calls the police;
Internet bar or office install door magnetism detector on computer box or monitor, somebody opens computer box or mobile monitor, detector is opened with respect to meeting drive lead plane alarm date calls the police;
From inside door magnetism detector dry spring is in charge of (also call reed the canal) two termination give a fine copper cash, will fine copper cash is bound or twine the object that defends in need to go up, if somebody attempts to move,the object that is defended causes fine copper cash to disconnect, lead plane can be opened alarm date calls the police;
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