Dust monitors and dust monitoring

Details Dust monitors and dust monitoring Dust monitors and dust monitoring

1989-12-01

1991-10-15

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

73 2406, 73 2805, G01N 1502, G01N 2902

Patent

active

050563556

ABSTRACT:
A dual monitor comprises a piezoelectric sensor in the form of a quartz crystal and an electrode system thereon. An exposure device in the form of a dust discriminator is provided to expose the piezoelectric sensor at least periodically to a stream of a gas which may contain dust or other organic or inorganic particulate material whose presence in or absence from the gas is to be monitored. The gas of said stream consists primarily of air. An electronic monitoring device is provided coupled to the electrode system of said piezoelectric sensor to monitor variations in the resonant frequency of said piezoelectric sensor induced by the aggregation of dust or other particulate material on said piezoelectric sensor.

REFERENCES:
patent: 3164004 (1965-01-01), King, Jr.
patent: 3260104 (1966-07-01), King, Jr.
patent: 3561253 (1971-02-01), Dorman
patent: 3653253 (1972-04-01), Olin
patent: 3715911 (1973-02-01), Chuan
patent: 4561286 (1985-12-01), Sekler et al.

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