Indicating system for atmospheric pump arrangement

Details Indicating system for atmospheric pump arrangement Indicating system for atmospheric pump arrangement

1981-05-04

1983-06-28

Swisher, S. Clement

Measuring and testing

Sampler, sample handling, etc.

Automatic control

7386323, 340529, 340607, G01N 124

Patent

active

043899030

ABSTRACT:
An atmospheric sampling pump arrangement employing a mass flow sensor which electronically monitors mass flow and compares it to a set-point value. The pump is then controlled in a manner that will minimize the difference between the measured flow and the set-point value. When the flow output drops below a predetermined value, a signal is energized to indicate the inability to maintain the desired flow. The system also incorporates a timer circuit which counts up the total amount of time that loss of flow regulation exists. After a predetermined period of cumulative loss of flow regulation, typically 30 minutes, a signal is energized to indicate this condition.

REFERENCES:
patent: 3855515 (1974-12-01), Hutchens, Jr.
patent: 3925773 (1975-12-01), Green
patent: 4067705 (1978-01-01), Kurz
patent: 4269059 (1981-05-01), Baker

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