Abstract: For a method for determining the concentration of aerosols in hot gases, particularly in exhaust gases of internal combustion engines, the removal of volatile and semi-volatile particles by heating the exhaust gas is provided, as well as the measurement of the concentration of the aerosols, optionally in a partial flow of an optionally diluted exhaust gas flow. In order to enable precise measurements of the aerosol concentration in the exhaust gas with lower energy consumption, the exhaust gas is divided in a first stage into two partial flows, both of which are heated, with one of the partial flows being filtered at least once, preferably before heating, and the two partial flows are subsequently recombined. In a second stage, the exhaust gas is again divided into two partial flows, with one of the partial flows being heated even further than in the first stage, and with the other partial flow being filtered at least once.

Abstract: For a method for determining the concentration of aerosols in hot gases, particularly in exhaust gases of internal combustion engines, the removal of volatile and semi-volatile particles by heating the exhaust gas is provided, as well as the measurement of the concentration of the aerosols, optionally in a partial flow of an optionally diluted exhaust gas flow. In order to enable precise measurements of the aerosol concentration in the exhaust gas with lower energy consumption, the exhaust gas is divided in a first stage into two partial flows, both of which are heated, with one of the partial flows being filtered at least once, preferably before heating, and the two partial flows are subsequently recombined. In a second stage, the exhaust gas is again divided into two partial flows, with one of the partial flows being heated even further than in the first stage, and with the other partial flow being filtered at least once.

Abstract: For a particularly compact device for removing the volatile particles from a sample gas with a simple design and a maximum of energy efficiency it is suggested to provide for a removal device (3) with an evaporator (7) and a catalyst (8), with the catalyst (8) being installed downstream of the evaporator (7), and furthermore to adjust the standard volumetric flow rate ({dot over (V)}) of the undiluted sample gas to a given catalytic efficiency of catalyst (8) by means of a flow limiting device (5).