Abstract: A device for determination of solid particle concentration includes a primary diluter (6), a downstream heated evaporator (7), a secondary diluter (8) downstream of the evaporator (7) and a particle counter (5). The secondary diluter (8) is a porous tube diluter and is mounted between the outlet of the evaporator (7) and a stabilization chamber (14), from which the sample flow is diverted to the particle counter (5).

Abstract: A rotating disc diluter (1) has a rotatable rotary element (4) which carries surface-accessible transfer volumes (9, 10) which along their common path of movement alternately glide over feed and discharge ports (11-18) for an undiluted fluid flow on the one hand and for a dilution fluid flow on the other hand. For the simple widening of the usable dilution rate range, the rotary element (4) has at least two rows of transfer volumes (9, 10) on different paths of movement, the associated feed ports (11-14) of which for the undiluted fluid flow and/or for the dilution fluid flow can be separately controlled.

Abstract: A reservoir (4) for the working fluid of the saturation unit (3) is connected with a sampling section (1) by a pressure equalization line (9) of the gas that is loaded with solid particles, as a result of which a sucking back of the working fluid from the reservoir (4) into the sampling section (1) and other sections of the measurement environment that are connected with such are prevented, even in the presence of unfavorable pressure conditions.

Abstract: A reservoir (4) for the working fluid of the saturation unit (3) is connected with a sampling section (1) by a pressure equalization line (9) of the gas that is loaded with solid particles, as a result of which a sucking back of the working fluid from the reservoir (4) into the sampling section (1) and other sections of the measurement environment that are connected with such are prevented, even in the presence of unfavorable pressure conditions.

Abstract: A device for determination of solid particle concentration includes a pre-diluter (6), a downstream heated evaporator (7), a secondary diluter (8) downstream of the evaporator (7) and a particle counter (5) connected to such. The secondary diluter (8) is a porous tube diluter and mounted between the outlet of the evaporator (7) and a stabilization chamber (14), from which the sample flow is branched off for the particle counter (5). With it, the concentration of the solid particles can be measured easily and controllably within a wide range without any corruption as a result of volatile aerosol particles.

Abstract: Abstract A rotating disc diluter (1) has a rotatable rotary element (4) which carries surface-accessible transfer volumes (9, 10) which along their common path of movement alternately glide over feed and discharge ports (11-18) for an undiluted fluid flow on the one hand and for a dilution fluid flow on the other hand. For the simple widening of the usable dilution rate range, the rotary element (4) has at least two rows of transfer volumes (9, 10) on different paths of movement, the associated feed ports (11-14) of which for the undiluted fluid flow and/or for the dilution fluid flow can be separately controlled.