Abstract
ABSTRACT TESTS were conducted to eval-uate the response of ionization-type detectors and combustible gas detectors to invisible aerosols and gases evolved from heated grain dust at temperatures below the igni-tion temperature. The concentration of aerosol particles as a func-tion of temperature and dust layer thickness was determined. The aerosol concentration from a heated surface is sensitive to dust layer thickness and at a given temperature and heating rate, it decreases quite rapidly for thicknesses greater than 0.03 cm. Thin dust layers heated at 24 C/min triggered a Pyr-A-Larm detector unit (set to respond at (2-3) x 105 particles/cm3) when the dust reached a temperature of 200 C, and at 225 C when the aerosol was drawn through a fiberglass filter. A combustible gas detector could be set to respond at temperatures well below the ignition temperature and did not appear to be sensitive to dust layer thickness of up to 0.64 cm. The potential application of such detectors in an early warning system to detect hot spots approaching dust ignition temperatures in a grain elevator or feed mill environment is dis-cussed.
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