Humidity monitor and method

Measuring and testing – Gas analysis – Moisture content or vapor pressure

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G01N 3100

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active

045051470

ABSTRACT:
Methods and apparatus for determining water content of gases and vapors. The primary sensing device is a fluidic oscillator through which a sample of gas is passed. It is primarily useful in systems where the moisture content is large and there is a small difference between the molecular weight of water and the average molecular weight of the other components of the gas (or vapor) or systems where there is a large difference between the molecular weight of water and the average molecular weight of the other components.

REFERENCES:
patent: 3273377 (1966-09-01), Testerman et al.
patent: 3554004 (1971-01-01), Rauch et al.
patent: 3665748 (1972-05-01), Mator
patent: 3756068 (1973-09-01), Villarroel et al.
patent: 4150561 (1979-04-01), Zupanick
NASA TM X-1939, "Sensing Molecular Weights of Gases with a Fluidic Oscillator" by M. J. LeRoy Jr. and S. H. Gorland.
Fossil Energy I & C Briefs, Nov. 1981, vol. 2, No. 6, "Fluidic Oscillator Sensors" by Trevor Sutton.
Instruments and Control Systems, Jan. 1971, pp. 81-82, "Molecular Weight Sensor" by M. J. LeRoy Jr. and S. H. Gorland.
NASA TM X-52780, "Evaluation of a Fluidic Oscillator as a Molecular-Weight Sensor of Gases" by M. J. LeRoy Jr. and S. H. Gorland.
Ind. Eng. Chem. Fundam., vol. 11, No. 3, 1972, pp. 407-409, "A Fluidic-Electronic Hybrid System for Measuring the Composition of Binary Mixtures" by C. Anderson et al.
NASA TM X-1269, "Use of a Fluidic Oscillator as a Humidity Sensor for a Hydrogen-Steam Mixture" by P. R. Prokopius.
NASA TM X-3068, "Use of Fluidic Oscillator to Measure Fuel-Air Ratios of Combustion Gases" by S. M. Riddlebaugh.
NASA Report No. L0341, 04-16-76, "Fluidic Hydrogen Detector Production Prototype Development" by G. W. Roe and R. E. Wright, (Sections 4 and 5 and Appendices have been omitted).

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