Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses is evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: A device for generating soot particles with a reproducible and variable size distribution includes a combustion chamber (1), to which it is possible to supply fuel and oxidation gas and in which a flame may be formed, which is fed by the fuel and by the oxidation gas and which generates soot particles, and a soot removal conduit (3), which is coupled with the combustion chamber, in that, for example, it comprises an inlet from it, wherein the soot removal conduit in addition includes an inlet for a quenching gas. The combustion chamber and the soot removal conduit are part of a hollow space, which is capable of being decoupled from the ambient air in such a manner, that it is possible for it to be impinged by a pressure, which is different from the atmospheric pressure.

Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses is evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: The invention relates to the characterising, separating and/or elimination of suspended particles in a carrier gas of an aerosol. According to a first aspect of the invention volatile suspended particles are eliminated in that in a first step the aerosol is heated to a temperature at which the volatile suspended particles evaporate and in a second step the aerosol is diluted with a dilution gas. The sequence of the first and of the second step may be exchanged. According to a second aspect a dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a third aspect of the invention, in a condensation nucleus counter not only is the number of scatter light pulses evaluated but also their intensity in order to be able to draw conclusions on the reliability of the measurement.

Abstract: A method and a system for analyzing gas samples employ at least two semiconductor sensor sets, used alternately. The sensor output signals are time-differentiated. As a result of these features, the time required for analysis can be reduced considerably, especially with an uninterrupted sequence of analyses to be performed in succession.

Abstract: In order to increase the reliability of detection of gaseous contamination in containers, gas (G) from the container is subject to several different methods of analysis (54a to 54d), each of which emits differing output signal courses (I.sub.1 to I.sub.4), depending on the contaminants and their concentration. A vector of the state vector type (P.sub.GAS) is formed with the output signals (I.sub.1 to I.sub.4) as a state variable and checked to see whether it defines a permissible or an unacceptable state of contamination (56). On the basis of this examination the decision is taken whether a container is acceptably or unacceptably contamined.