The invention presents a hydrocarbon sensor excellent in yield and high in detection precision. In an embodiment of the office information system, a path record storage device stores a plurality of path records related to components of the system, each path record indicating a locating path needed to reach a location of a specific one of the components in the system when a failure related to the specific one of the components occurs. The embedded processor is debugged using information from the configuration file. The cavity is configured to minimize the quantity of air between the fuse and the fuse housing to facilitates heat transfer. The baffle element is removable together with the filter element from the filter housing and has at least one baffle surface that is slanted relative to the longitudinal axis.