Gas analysis device i.e. ion mobility spectrometer, for detecting smallest concentration of e.g. drug, has dosing unit operable in dilution operation in which dilution ratio of through flow resistance takes finite value different from zero

摘要

The device i.e. ion mobility spectrometer (1), has a carrier gas circuit (5) guiding from a carrier gas outlet (7) of a dosing unit (6) to a carrier gas inlet (3) of an analysis unit (2) and guiding from a carrier gas outlet (4) of the analysis unit to a carrier gas inlet (8) of the dosing unit. The dosing unit is operable in a dilution operation in which a dilution ratio of a through flow resistance (R2) takes a finite value different from zero for summing of an outflow resistance (R1), through flow resistance and an inflow resistance (R3).