Measuring and testing – Gas analysis – Gas chromatography
Patent
1982-10-22
1984-09-11
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
G01N 3108
Patent
active
044702981
ABSTRACT:
Apparatus and method for analyzing gases, especially respiratory gases for oxygen and carbon dioxide content, and for measuring pulmonary functions; such comprising a detector employing thermistors forming parts of a Wheatstone bridge circuit, one of which is in contact with a carrier gas, the other with a sample of the gas to be analyzed sandwiched between carrier gas in advance of and trailing the sample, the output of the detector being sensed by a recorder and transduced into a tracing; the gas to be analyzed being passed through a column or columns of adsorbent material which selectively retains certain components of the gas and releases them in a time ordered sequence; the test thermistor having its temperature varied in accordance with the composition of the gas; the adsorptive material being selected as to its composition and geometry to bring about separation and release of components of the gas in a time ordered sequence and within a very short period of time; the gas circuit being adapted to minimize errors in the voltage peaks corresponding to components of the gas.
REFERENCES:
patent: 2837618 (1958-06-01), Gildart
patent: 3056277 (1962-10-01), Brenner
patent: 3080745 (1963-03-01), Jones
patent: 3091957 (1963-06-01), Hampton
patent: 3134257 (1964-05-01), Reinecke
patent: 3895630 (1975-07-01), Bachman
patent: 3927670 (1975-12-01), Turney et al.
R. E. Walker et al., "Precision Thermal-Conductivity Gas Analyzer Using Thermistors", Rev. of Scie. Instr., vol. 28, No. 10, pp. 789-792, Oct. 1957.
Thermal Conductivity Detector Elements for Gas Analysis from Gow-Mac, Bulletin SB-13, pp. 1-7, Jun. 1971.
Gregg Edward B.
Kreitman Stephen A.
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