Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1989-05-17
1991-03-19
Williams, Hezron E.
Measuring and testing
Sampler, sample handling, etc.
Automatic control
G01N 124
Patent
active
050000527
ABSTRACT:
The present invention is concerned with a controlled sampler device which draws a gas through a contaminant collection device. The controlled sampler comprises an inlet to the sampler; a pump adapted to draw a gas through the inlet; a reference element that provides a reference signal; a feedback element with an output; a differential pressure transducer to compare the reference signal with the feedback signal to provide an error signal that is linearly related to selected and measured values; an integrator with an input connected to the output of the differential pressure transducer and to a summer; and means between the differential pressure transducer and the summer to provide a signal to the summer which is proportional to the error signal, which is passed to a driver which regulates the speed of an electric motor to change the flow rate to reduce the error signal to a null.
REFERENCES:
patent: 3784902 (1974-01-01), Huber
patent: 3965748 (1976-06-01), Boubel et al.
patent: 4067705 (1978-01-01), Kurz
patent: 4237451 (1980-12-01), Hollenbeck
patent: 4432248 (1984-02-01), Lalin
patent: 4566342 (1986-01-01), Kurz
patent: 4569235 (1986-02-01), Conkle et al.
Roskos Joseph W.
Williams Hezron E.
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