The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1999
Filed:
Oct. 29, 1997
Reinhold Muench, Freiburg, DE;
Testo GmbH & Co., Lenzkirch, DE;
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.