1992 - 2016 manufactured by Adolf Kuhner AG, Birsfelden, Switzerland
Apparatus for determining the minimum ignition energy of dust/air-mixturesFor an assessment of the hazard situation in dust-processing installations, knowledge of the minimum ignition energy is indispensable. This value can possibly determine the extent and hence the cost of protective measures.
A modified Hartmann tube made of glass with a volume of 1.2 liter is used as the explosion vessel. The dust dispersion system at the base of the tube is of the "mushroom-shaped" type around which the sample is loosely scattered. A blast of compressed air at 7 bar is used to disperse the dust in the glass cylinder where it is ignited by a spark between two electrodes.
Experiments have shown that dust/air mixtures can easily have MIE values less than 10 mJ. The measurement range of the MIKE 3 has thus been extended to lower energy values. The high-voltage component has been specially designed for the low ignition energies. Thanks to pneumatically actuated high-voltage switches, the parasitic capacitances have been reduced by an order of magnitude. Energy range: 1mJ ... 1000mJ