The device and principle of work of the security alarm system of the house

Devices of the security alarm system of the newest generation allow to secure house weak spots optimum. Thus considerable works on installation are not necessary.

In contrast to separate small signalling devices, devices of the security alarm system form interdependent system. They consist of three components.

One of them - gauges which as sensitive elements - sensor controls - perceive physical changes, such as fluctuations; noise or changes of temperature and then transfer them to the central board. This transfer can be made on a wire or through an aether. In the central board arriving impulses are processed, the alarm signal which moves further to executive devices joins. The alarm can move opticheski - a light signal or light flashes; acoustically - sirens or other noise devices; or electronic devices which again include devices or carry out other functions. Gauges work at magnetic field interruption (priotkryvanie doors or windows), arising at razbivanii glasses of frequencies, press contact, the slightest concussions, interruption of an infra-red beam or other changes in protected object. Movement gauges react to moving infra-red radiation of a human body. On pressing under a floor covering, contact plates react to furniture moving - the gauges reacting to change of the site in space.

EXECUTIVE DEVICES

For external and internal application there are such typical executive devices, as sirens and strong svetovspyshki (stroboscopes). For facades of houses is klimaticheski the steady combined devices. For protection maintenance indoors there are devices of the smaller sizes, but also these models not less bright and loud.

Executive devices can be also relays which are included by more powerful consumers of a current, as for example projectors or the telephone device (with a TV set-admission) which dials under numbers brought in memory in corresponding services. To you on a pager or on a mobile phone.

RADIO DEVICES

The house equipped with all listed gauges, it is undesirable to entangle wires. Though cables thin enough also can be easily laid, an expense for it will not name insignificant. To each gauge there is a conducting which has also the special resistance excluding short circuit of a line. It transfers an alarm signal if near the security device any manipulations are made. Easier installation of the device with a broadcast: freely established gauges of movement with the built in batteries transfer an alarm signal to the central board without means of wires. Irrespective of a network of power supply of a building and by radio contact gauges to which it is possible to carry many gauges connected through tips razbivanija glasses or magnitno-contact gauges work. Works on their establishment the minimum.

The combination of both systems is possible also: on a wire there where it is easy for spending, and by radio for remote objects. At small security devices the system of the notification of alarm is in the central board. Sirens being out of a board and stroboscopes are connected to it.

ACCESSORIES OF SECURITY DEVICES

The major knot of any device of the security alarm system is the central board. In it the impulses transferred on wires or on a radio communication from gauges (sensor controls) are accepted and processed. In it corresponding executive devices join.

The alarm signal can be distributed at once or with some time lag that owners had possibility, having entered into a premise, to disconnect the security device by means of the keyboard controller which is intellectual analogue of the coded lock. Deaktivizatsija (switching-off) can be done also by means of a manual radio transmitter. The security device manually by means of the keyboard controller (with some time lag), through the electromechanical lock, and also outside by radio again joins. For all systems of the security alarm system the emergency electrical supply which should be built in in the central board is important. It ensures functioning of system by means of the charged accumulators or batteries when giving of a current suddenly stops or it disconnect. The central boards of the security alarm system are delivered ready in the form of compact devices. They can be collected also from separate knots or to order such service as the husband on hour, and to ask the master to make it for you. Thus boards can be designed individually, proceeding from features of a kind and size of protected objects and from local features. Thus it is necessary to use the recommendations, containing in brochures and prospectuses of manufacturers and senders of devices of the security alarm system. Private security at the Department of Internal Affairs, and also specialised firms can give inquiries on use of the security alarm system and at its choice.

EXECUTIVE DEVICES

Separate electric schemes of security system can consist of several lines. They function by a principle "there is a current in a chain" or by a principle "there is no current in a chain", that is on rupture and on short circuit in a chain. The majority of gauges of security devices can be connected both in the first, and in the second mode. The mode "is a current in a chain" means that the network at influence on the gauge becomes isolated. The mode "is not present a current in a chain" means that at rest all contacts are closed, and at influence on the gauge are disconnected. The combination of both modes on one line is possible.

The scheme is resulted in a working condition by the switch which operates by the principle opposite to connected gauges. If to build in special resistance conclusion possibility out of operation separate lines which inform at once on any attempts to disconnect the device is excluded.