SECURITY ALARM DEVICE Russian patent published in 1999 - IPC

FIELD: security and fire protection equipment. SUBSTANCE: Goal of invention is achieved by introduced second signal continuity selector, relative pulse duration generator, electronic gate, second integrator and second threshold gate. Device provides possibility to separate fire detection function in order to generate Fire signal sent through separate communication line and to turn on built-in illumination indicator. EFFECT: increased reliability of operations. 3 cl, 3 dwg