Security alarm system. Security magnetocontact announcers
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Now in systems of protection of objects, magnetocontact announcers on the basis of gerkon which are used for blocking of various door, window openings, and other designs working for opening, shift and movement were widely adopted. Broad application of such announcers is caused by their low cost, high reliability and durability, simplicity of application and the widest nomenclature of standard sizes. High reliability and durability of these products is caused by properties of a gerkon as basic element of a design. Gerkon represents the contact group pressurized in a glass flask which parameters are provided with the environment of gas filling and a covering of contact surfaces, operated by an external magnetic field. This design provides the following parameters of gerkon, low transitional resistance in the range of 0,05 - 0,15 Ohms, high wear resistance - an operating time of 1 000 000 and more operations, switching of currents in the range from 5 ma to 1 A.
Gerkon is ideally suited for needs of protection during the work with a permanent magnet, provides protection against a sjem of information as is a gap in an alarm system loop in the opened state and part of this loop in closed.
The principle of work of magnetocontact announcers is based on interaction of two elements: the element setting (with a magnet) and an element sensitive (with gerkony).
On nature of application there are following types of announcers:
- announcers for superficial installation on not steel structures (IO 102 - 2, IO 102 - 4, IO 102 - 16/1, IO 102 - 16/2);
- announcers for the hidden installation on not steel structures (IO 102 - 5, IO 102 - 15/1, IO 102 - 15/2).
Announcers security on the basis of the pressurized contacts are certified and included in "The bulletin of the technical means of safety recommended for use by private security" to Research Center OHRANA.