BURGLAR ALARM DEVICE Russian patent published in 1995 - IPC

FIELD: burglar alarm. SUBSTANCE: burglar alarm device functions to send alarm messages to receiving monitors over alarm loop in case of destruction of glass pane in window and other openings of guarded premises and to store these messages. Device has sensing element with movable contacts connected through communicating line with one contact to first input of integrator and with its second contact, to common power bus of device, actuating element whose input is connected to integrator output, first current-setting element whose first lead is connected to first lead of display, first polarity selector connected through voltage source to actuating element supply lead, storage capacitor connected to actuating element supply lead, second polarity selector whose input is connected to power supply; in addition, it is provided with voltage regulator, second and third current-setting elements, energy storage unit, unidirectional current regulator, filter, safety element connected to actuating element input; voltage regulator input is connected to storage capacitor and its output is connected through second current-setting element to second input of integrator and to energy storage unit; first lead of unidirectional current regulator is connected to actuating element output and to second lead of display; control input is connected via third current-setting element to first lead of display; filter output is connected to second lead of display and its input, to output of second polarity selector. EFFECT: improved validity of detection of destructed glass pane in guarded premises. 4 cl, 1 dwg