A flat fuel cell assembly including a membrane electrode assembly, a cathode porous current collector, an anode porous current collector and a gas barrier material layer is provided. The second conduit has a seal seat and a compression member. The rotary-type partition can be easily moved from its rest position to its operating position, or vice versa, with single manual operation. The correlation function extraction unit extracts a correlation function from a plurality of candidates for a correlation function as a correlation function for each pair of metrics, on the basis of a detection sensitivity indicating a likelihood of correlation destruction caused at the time of abnormality of a metric associated with a correlation function.