Apparatus for measuring charge on, and density of, airborne part

Details Apparatus for measuring charge on, and density of, airborne part Apparatus for measuring charge on, and density of, airborne part

1977-07-05

1978-10-03

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Solid content of gas

324 32, G01N 3100, G01R 528

Patent

active

041177150

ABSTRACT:
A simple, inexpensive, hand-held and operated apparatus for providing a substantially immediate indication of the density of, and charge on, airborne particulate contaminants of a predetermined size or within a predetermined size range includes a first filter for removing particulate contaminants having a size greater than the maximum size of the range, and a second filter for passing all particulate contaminants having size smaller than the minimum size of the range. The two filters are arranged in series in a housing, and a hand-operated pump having a known capacity is used to draw contaminant-laden air through the series filters. A conductive screen is placed against the second filter to provide an electrical indication of the polarity of the charge on the contaminants trapped by the second filter.

REFERENCES:
patent: 1517144 (1924-11-01), Anderson
patent: 2129527 (1938-09-01), Fassin
patent: 3605485 (1971-09-01), Badzioch et al.
patent: 3753102 (1973-08-01), Beck

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