Warning aspirant and method of operating the same fire.

摘要

Method for recognizing blockages and interruptions in the tube system of a warning suction fire inhales air, through the tube system, the air of one or more local or appliances under surveillance which monitors said air concerning characteristic quantities fire and, compared to specified limit values, monitors a mass flow rate and / or volume flow obtained with a sensor airflow and / or on the basis of current data of a fan, characterized in that a value is obtained correction representing variations in properties of the system comprising the tube and the fan, which are based on variations in air density and / or at least one environmental parameter which causes a variation in air density, and which is used for correcting the measured value of mass flow and / or volume flow and / or adaptation of limit values.