The course covers the principles of early fire detection and fire hazardous situations and principles of the function of various detectors and complete fire detection and alarm systems (FDAS). The problems how to determine the time of fire detection are also discussed. Particular attention is paid to effective automatic fire detection in different spaces using FDAS and the cooperation of FDAS with other fire-safety devices (FSD) and the inclusion of FSD to the fire safety of buildings and technologies.