Abstract: A measuring device for measuring a concentration of a gas component in a gas includes a flow generating device, a first conduit, a second conduit, and an electrochemical detector configured for sensing the gas component concentration in the gas. The first and second conduits are arranged in parallel, and the flow generating device is connected with an inlet of the first conduit and an inlet of the second conduit. The flow generating device is arranged for generating a gas flow in each of the conduits. The measuring device is arranged to alternately couple either an outlet of the first conduit or an outlet of the second conduit to an inlet of the detector, wherein the first conduit is provided with a reactant for absorbing or stripping the gas component.

Abstract: A measuring device for measuring a concentration of a gas component in a gas includes a flow generating device, a first conduit, a second conduit, and an electrochemical detector configured for sensing the gas component concentration in the gas. The first and second conduits are arranged in parallel, and the flow generating device is connected with an inlet of the first conduit and an inlet of the second conduit. The flow generating device is arranged for generating a gas flow in each of the conduits. The measuring device is arranged to alternately couple either an outlet of the first conduit or an outlet of the second conduit to an inlet of the detector, wherein the first conduit is provided with a reactant for absorbing or stripping the gas component.

Abstract: Method and assembly for determining the presence of soot particles in a gas stream such as in the air. To prevent the disturbing effect of salts and the like that may be deposited on soot particles, it is proposed to introduce the soot particles into water as a suspension. The salts concerned dissolve in the water and have no effect when determining the change in optical properties resulting from the presence of the soot particles. This determination comprises in particular a light transmittance measurement. The presence of the soot particles can be determined after the gas stream is first passed through a filter, as a result of which a particle size distribution can be determined. Suspension of the soot particles can be achieved by subjecting these to a stream of steam, whereby the steam condenses on the soot particles and then causes these to precipitate out of the gas. The various processes can be expedited by using a cyclone.

Abstract: Method and assembly for determining the presence of soot particles in a gas stream such as in the air. To prevent the disturbing effect of salts and the like that may be deposited on soot particles, it is proposed to introduce the soot particles into water as a suspension. The salts concerned dissolve in the water and have no effect when determining the change in optical properties resulting from the presence of the soot particles. This determination comprises in particular a light transmittance measurement. The presence of the soot particles can be determined after the gas stream is first passed through a filter, as a result of which a particle size distribution can be determined. Suspension of the soot particles can be achieved by subjecting these to a stream of steam, whereby the steam condenses on the soot particles and then causes these to precipitate out of the gas. The various processes can be expedited by using a cyclone.