Conimeter

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A Konimeter or Koniometer (from the Greek "kónis" dust) is a device for measuring the dust content in the air . The measurement result is output as the number of particles per volume unit. Konimeters can be operated both continuously and discontinuously.

background

The measuring principle is based on the fact that a defined amount of air is conveyed through a narrow gap, with a glass plate coated with an adhesive (e.g. glycerine or glucose ) under the opening on which the dust particles adhere. This measuring principle thus corresponds to that of a single-stage impactor . After the gap has been closed, the amount and size of the adhering particles can be determined on the glass plate with the aid of a microscope . It is important that the adhesive is transparent.

Conimeters are used in places where it is important to determine the air quality, for example in mines, mills, paint shops, cement works, weather monitoring stations and health resorts. Today, however, they are mostly replaced by automatically working measuring devices. For use in mines, special mining conimeters have been developed that contain a sedimentation chamber in order to only measure fine dust .

An apparatus called the “aeroscope” comparable to the later Konimeter was developed in 1878 by P. Miquel . A decisive improvement for finer particles was then achieved by Robert Kotzé in 1919 . In the Federal Republic of Germany, conimeters were used to determine the proportion of dust with a diameter of less than 5 µm until the 1970s. A VDI guideline from 1968 on measuring the dust concentration with a conimeter was withdrawn in August 2010.

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Individual evidence

  1. ↑ a b D. Hasenclever: Investigations into the suitability of various dust measuring devices for the operational measurement of mineral dusts. In: dust . No. 41, 1955, pp. 388-435.
  2. ↑ VDI 2266 sheet 2: 1968-08 Measurement of the dust concentration at the workplace; Measurement of particle number; Measure with the Konimeter. VDI publishing house, Düsseldorf. P. 2.
  3. ↑ Kvetoslav Spurny (Ed.): Analytical Chemistry of Aerosols: Science and Technology. CRC Press, Lewis Publishers, New York 1999, ISBN 1-56670-040-X , p. 6.
  4. ↑ Hans Breuer: Experimental investigations on the influence of the flow and suction speed on the measurement display of various dust measuring devices in coal mining. In: dust. 22, No. 3, 1962, pp. 91-95.
  5. ^ Gustav Kühnen, Wolfgang Pfeiffer, Edgar Rudolf: Development of the dust measurement technology at the workplace. In: Dust - cleanliness. Air . 46, No. 4, 1986, ISSN  0949-8036 , pp. 177-181.
  6. ^ Association of German Engineers : VDI guideline: VDI 2266 sheet 2 Measurement of the dust concentration at the workplace; Measurement of particle number; Measuring with the Konimeter , accessed on December 25, 2016