Chemical dosimeter having a constant flow air sampling pump

Details Chemical dosimeter having a constant flow air sampling pump Chemical dosimeter having a constant flow air sampling pump

G - Physics

01

N

73/104, 73/97

G01N 1/18 (2006.01) G01N 1/24 (2006.01)

Patent

CA 1077740

Abstract of the Disclosure An improved chemical dosimeter for individual use which collects on a filter particles or vapors present in an air stream which is being pumped through the dosimeter at a constant rate, the improvement is the use of a variable drive pump that is connected to the filter and that is driven by an electric motor and is controlled by a feed back circuit of an integrator and an amplifier and maintains a constant flow of air through the dosimeter; the integrator receives a signal from a pressure switch that detects changes in the flow of the air stream through the dosimeter by a change in a pressure drop of the air which is being pumped through an orifice; the dosimeter is worn by an individual and at the termination of a period of time, such as a work day, the filter is removed and the collected contents are analyzed by conventional techniques such as gas chromatography to deter- mine a level of exposure of the individual using the dosimeter.

288159

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