| sec.sys. |
BMS (Balanced Magnetic Switch (BMS) – The magnetic switches are the most ubiquitous security devices in the world, used for Both doors and windows protection. They consist of a magnet, which is installed on a door or window, and a switch unit, which is installed on the frame or jamb. When the door or window is in the closed position, the created circuit is closed; when the door or window is opened, the circuit is open, which causes an alarm to be initiated. A Balanced Magnetic Switch (BMS) employs a magnet in both the switch and magnet units. The switch unit, which contains a magnetic reed switch, a bias magnet, and tamper/supervisory circuitry, is mounted on the stationary part of the door or window unit. The component containing the larger permanent magnet is mounted on the movable part of the door or window, adjacent to the switch unit installed on the frame or jamb when the door is closed. With the door or window closed, the magnets are adjusted to create a magnetic loop, causing the reed switch to experience a magnetic field of essentially zero.: Магнитоконтактный датчик (геркон) может срабатывать на открывание и на закрывание дверей или окон. eugene12345) |
