Method and apparatus for determining the charging of charcoal fi

Details Method and apparatus for determining the charging of charcoal fi Method and apparatus for determining the charging of charcoal fi

1987-01-02

1989-02-28

Levy, Stewart J.

Measuring and testing

With fluid pressure

Porosity or permeability

73599, G01N 2900

Patent

active

048074667

ABSTRACT:
For determining the charging of a charcoal filter with gases and vapors the acoustical and the electrical impedance of the charcoal layer are measured. The more the filter is charged the greater will be the density of the charcoal layer and therewith its acoustical conductivity. The charging of a charcoal layer with water vapor results in an increase of the acoustical as well as of the electrical conductivity. By comparing the acoustical impedance and the electrical impedance respectively of a partially charged charcoal layer with the impedance of a non-charged charcoal layer and by subsequent comparison of the impedance changes caused by such charging the influence of water vapor can be eliminated. A signal is generated corresponding to the charging of the charcoal filter with other vapors and gases which signal may be used for indicating the condition of the filter and for generating an alarm if the filter becomes exhausted.

REFERENCES:
patent: 4111034 (1978-09-01), Hubner
patent: 4237726 (1980-12-01), Peterson et al.
patent: 4472356 (1984-09-01), Kolesar
patent: 4481820 (1984-11-01), Thomann
patent: 4530706 (1985-07-01), Jones
Longstaff, B. G. et al., Measurement of Acoustic Absorption by Means of Twin Impedance Tubes, in Noise, Shock & Vibration Conference, Melbourne, Aust., May 1974, pp. 154-160.

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