G - Physics – 01 – N
Patent
G - Physics
01
N
73/97
G01N 1/22 (2006.01) G01N 33/00 (2006.01) G05D 7/06 (2006.01) G01N 1/24 (2006.01)
Patent
CA 1116434
ABSTRACT OF THE DISCLOSURE An improved dosimeter having a low air flow rate for monitoring working areas in which air is pumped through the dosimeter at a controlled constant low rate of flow and any particles or vapors in the air are collected on a filter, a variable drive pump having an inlet and an outlet is con- nected to the filter and is driven by an electric motor and controlled by a feed back circuit of an integrator and an amplifier and the pump maintains a constant flow of air through the dosimeter; in operation of the dosimeter the integrator receives a signal from a pressure switch that detects changes in the flow for the air stream through the dosimeter by a change in a pressure drop of the air which is being pumped through an orifice; the improvement is the use of an adjustable by- pass valve connected in parallel with the variable drive pump in such a manner that regulated quantities of air from the outlet of the pump are recycled to the inlet of the pump thereby allowing the pump to provide a constant low flow rate of air; in utilization of the dosimeter. the dosimeter is placed in a work area or worn by an individual and at the termination of a period of time, such as a work day, the fil- ter is removed and the contents collected are analyzed by conventional techniques such as gas chromatography to deter- mine a level of exposure of individuals working in that area.
336388
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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