Method and device for determining the concentration of a substan

Measuring and testing – Gas analysis – With compensation detail

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G01N 27416

Patent

active

058803521

ABSTRACT:
A method for determining the concentration of a substance in a gaseous medium using a chemical sensor is disclosed. To ensure that the concentration is within the nominal measuring range of the sensor, the sample gas stream is mixed with a diluting gas stream in a mixing device to form a measured gas stream. This mixing process involves setting an adjustable dilution ratio and alternately supplying the sample gas stream and diluting gas stream to the mixing device. By adjusting the amount of time each gas is supplied to the mixing device the dilution ration can be varied to thereby maintain the concentration of the substance detected by chemical sensor within the nominal measuring range of the sensor. Calculation of the concentration of the substance is thus simplified since the dilution ration is automatically a known quantity since the sample gas stream and diluting gas stream are supplied cyclically alternately and in succession with a definite volume flow to measuring device.

REFERENCES:
patent: 3923461 (1975-12-01), Barden
patent: 4565086 (1986-01-01), Orr, Jr.
patent: 5569838 (1996-10-01), Broedel et al.
patent: 5691464 (1997-11-01), Cao
patent: 5756360 (1998-05-01), Harvey et al.

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