Dosimeter for detecting chemical substances

申请公布号：CH628439(A5)

申请号：CH19770012969

申请日期：1977.10.25

申请公布日期：1982.02.26

申请人：

DU PONT DE NEMOURS (E.I.) & CO.

发明人：WILLIAM BARRY BAKER;DONALD GLENN CLARK

分类号：G01N1/24;G01N33/00;(IPC1-7):G01N35/00

主分类号：G01N1/24

摘要：The dosimeter is used to detect chemical substances from an air stream which is conveyed through the dosimeter at a constant flow rate. In order to be able to maintain a constant air flow rate, independently of the loading of the filter, there are arranged, downstream of the pump (3) having a controllable electrical drive (9), an air equalisation container (4) and an orifice plate (5) whose pressure drop is measured by means of a differential pressure switch (6). It generates an electrical signal which is fed, via an integrating circuit (7), to an amplifier circuit (8) so that it alters the speed of the motor (9) in such a way that the pump generates a constant flow velocity. <IMAGE>

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