Abstract: A detected information display system in a fire detecting system of the present invention which is equipped with detectors arranged in a warning area and a control panel and achieves a specified information display on a physical quantity detected by the detectors, includes a secondary conversion part to convert the physical quantity detected by the detector to the specified level, a conversion level storage part to store the converted level, an extraction part to extract the maximum level from the levels stored in the conversion level storage part, and a display part which is equipped with level display parts, and keeps the level display part corresponding to the converted level and the level display part corresponding to the maximum extracted level in a visually different condition from each other. The maximum detected physical quantity and the set value to indicate the abnormal level can be rapidly grasped, and the displays of a plurality of detectors can be displayed in an integrated and related manner.

Abstract: A fire sensing method and apparatus for detecting a fire based on the detection of a hydrocarbon gas produced before fire ignition and the detection of a second fire indicating phenomenon. Such other phenomenon may comprise the detection of temperature, radiation or combustion product gases. The detection of hydrocarbon gas may generate a pre-alarm condition which permits the use of higher sensitivity conditions for the second fire indicating phenomenon.