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(a) Gas reservoir; (b) mass flowmeters; (c) bubbler; (d) stainless steel measurement chamber; (e) array of eight sensors; (f,h) signal connection cables; (g) heater drivers; (i) NI-PXI (PXI System-National Instruments) for real-time application; (l) ethernet link; (m) host computer with NI Labview Software for automated tests; (n) serial link; (o) extractor hood; (p) alumina substrate; (q) temperature sensor; (r) screen-printed sensing material.
