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

#CMT# #/CMT# 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). #CMT#USE : #/CMT# Gas analysis device i.e. ion mobility spectrometer (claimed), for detecting smallest concentrations of a gaseous substance of an explosive, drug, chemical agent and a toxic industrial gas. #CMT#ADVANTAGE : #/CMT# The dosing unit is operable in the dilution operation in which the dilution ratio of the through flow resistance takes the finite value different from zero for summing of the outflow resistance, through flow resistance and the inflow resistance, so that fast detection of smallest concentrations of gaseous substances can be achieved. The device can be operated in an optimized operating condition. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic circuit diagram of an ion mobility spectrometer that is provided with a dosing unit for feeding sample gas. R1 : Outflow resistance R2 : Through flow resistance R3 : Inflow resistance 1 : Ion mobility spectrometer 2 : Analysis unit 3 : Carrier gas inlet 4 : Carrier gas outlet 5 : Carrier gas circuit 6 : Dosing unit 7 : Carrier gas outlet 8 : Carrier gas inlet.