Blackness index according to Bosch

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The Bosch blackening number is a measure for assessing the smoke density of diesel engine exhaust gases .

background

To determine the smoke density of exhaust gases, a defined exhaust gas volume flow , which was taken from the exhaust pipe of the engine, is passed through a filter paper . The gray coloring on the filter paper is then evaluated. With the help of a reflection photometer, the gray value is recorded and then assigned to a blackening scale. 100% reflection corresponds to a blackening number 0, the blackening number 10 is assigned 0% reflection. Values ​​in between are interpolated linearly . The evaluation of the blackening on the filter has to be carried out electro-optically, since the resolution of optical comparison cards is insufficient, as is the case with the determination of the soot number .

Both the TRGS 554 and the VDI guideline VDI 2511 refer to the Bosch blackening number .

The blackening number correlates with the mass of the soot deposited on the filter , but the relationship is not linear.

literature

  • Franz Joseph Dreyhaupt (Ed.): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf 1994, ISBN 3-18-400891-6 , p. 1050.

Individual evidence

  1. ↑ Valerie Wilms: The current TRGS 554 - module for assessing and minimizing exposure to diesel engine emissions at the workplace. In: Hazardous substances - cleanliness. Air . 62, No. 1/2, 2002, ISSN  0949-8036 , pp. 30-36.
  2. ↑ TRGS 554, October 2008 edition, exhaust gases from diesel engines, pp. 17–18.
  3. ↑ VDI 2511: 2018-06 industrial trucks; Regular checking, minimum requirements. Beuth Verlag, Berlin, p. 15.
  4. ↑ J. Winckler: Specific problems with sampling and measurement of diesel exhaust gases. In: VDI Commission for keeping the air clean, VDI Society for Vehicle Technology: Reducing emissions from automobile exhaust gases - diesel engines. VDI-Verlag Düsseldorf 1985, ISBN 3-18-090559-X , pp. 355-384.