Measuring and testing – Gas analysis – Solid content of gas
Patent
1979-03-19
1981-05-26
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Solid content of gas
G01N 124
Patent
active
042690595
ABSTRACT:
An improved dosimeter designed for individual use that has a filter for collecting particles or vapors present in an air stream being pumped through the dosimeter, a variable drive pump that draws the air stream through the filter, an electric motor coupled to the variable drive pump, an electric power source for the motor, an air reservoir connected to the pump, an orifice position in a tube attached to the air reservoir which creates a pressure drop in the air stream, a differential pressure switch positioned before the orifice that is activated by a change in air pressure and creates a low voltage electrical input signal; an integrator circuit that uses the low voltage input signal of the pressure switch and integrates this signal, an amplifier circuit which amplifies the signal from the integrator circuit and feeds the signal to the electric motor thereby controlling the speed of the motor driving the pump in relationship to the signal generated by the pressure switch to maintain the air stream at a constant flow rate; the improvement that is used therewith is as follows:
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E. I. Du Pont de Nemours and Company
Kreitman Stephen A.
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