DETECTOR FOR DEFINITION OF TOXIC IMPURITIES IN A GAS

FIELD: definition of physical and chemical properties of gases. ^ SUBSTANCE: the invention presents a detector for definition of toxic impurities in a gas and is dealt with a field of definition of physical and chemical properties of gases. The technical result is prevention of penetration of high concentrations of parasitic impurities into a continuous-flow ionic-drift chamber; reduction of an effect on the detector; increase of reliability of the detector operation. The essence of the invention consists in the following: the detector for definition of toxic impurities concentration in the gases, containing a continuous-flow ionic-drift chamber (1) with located in it at its opposite butts two basic electrodes (2) and (3), electric shutters in the form of grids (4) and (5), located between the basic electrodes (2) and (3), ring protection electrodes (6) located along the walls of the continuous-flow ionic-drift chamber (1), a source of ionization (7), a branch pipe for a supply of an analyzed gas (8), a branch pipe for a supply of a drift gas (9) and a branch pipe for the gases withdrawal (10). The detector is supplied with a unit of selection of a signal received from ions-reactants (11), a filter for clearing a gas (12) and a valve distributor of a gas (13). At that the branch pipe for a supply of an analyzed gas (8) is connected to the inlet (14) of valve distributor of a gas (13), the first output (15) of which and the outlet (16) of the filter for clearing a gas (12) are connected to a pneumatic inlet (17) of the continuous-flow ionic-drift chamber (1). An inlet (18) of the filter for clearing a gas (12) is connected to the second outlet (19) of the valve distributor of a gas (13), and one of the basic electrodes (3) of the continuous-flow ionic-drift chamber (1), being a collector of ions, is connected to an inlet (20) of the unit of selection of a signal received from ions-reactants (11)and the outlet (21) of which is connected to an electric managing input(entrance) (22) of the valve distributor of a gas (13). ^ EFFECT: the invention allows to prevent of high concentrations of parasitic impurities in a continuous-flow ionic-drift chamber, to increase reliability of the detector operation. ^ 1 dwg