The type KS-407-M automatic emission dust sampler measuring circuit and probe head have been developed for gravimetric determination of solid pollutants to be found in exhaust gases of motor vehicles and, testing of motor oils. It is well-known that the quality of motor oils used in diesel oil fuelled engines greatly influences – favourably or adversely – the quantity and quality of the solid pollutants that can be found in the exhaust gas. The known measurement methods do not facilitate formal, micro-probe measurement by weight of solid particles existing in the exhaust gas.

With use of the KS-407-M measuring circuit the dust concentration of the solid pollutants existing in the exhaust gases of various motors can be determined to unique accuracy by weight – gravimetrically – and, with an adequate impactor amendment, the fraction of the solid particles as well. Controlling of the isokinetic sampling and documenting of the measurement data is performed by a notebook or a personal computer with use of Window-based AR-IZO 407-M v3.3 software.

The construction of the measuring circuit is shown in Figure 1. The total quantity of the gas leaving the exhaust port of the motor vehicle is flowing, through a rectifying and low-drag pipe section of adequate length and a Venturi meter, into the measuring cell. The solid material sample taken isokinetically, at velocity practically identical to that of the gas, is depositing in a bag filter, shown in Figure 2. The isokinetic sampling is controlled by the differential pressure signal of the Venturi meter.