PURPOSE: A fluid analyte measuring system, a remote fluid analyte measuring system, an inflammable fuel pollutant measuring system, a fluid analyte measuring method, and an In-Line membrane filtering probe are provided to be appropriate for an industrial application. CONSTITUTION: A fluid flow path(20) includes a fluid inflow port(24) and a fluid outflow port(26). An extracted fluid flow path(22) includes an extracted fluid inflow port(28) and an extracted fluid outflow port(30). An extracting part(12) extracts an analyte from a fluid flow(32) provided into the fluid flow path(20) by sticking an extracted fluid flow(34) fast to a fluid flow(32) provided into the extracted fluid inflow path(22). A sample head vessel(14) is combined with the extracted fluid outflow port(30) by a pipe. At least one probe(16) combining with the sample head vessel(14), generates signal presenting a characteristic of fluid analyte. A circuit(18) combining with at least one probe(16), measures the signal generated from at least one probe(16).
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