System for introducing gas specimens into reduced pressure type analysers

摘要

1,059,755. Sampling gases. SOC. NATIONALE DES PETROLES D'AQUITAINE. July 19, 1965 [July 23, 1964], No.30648/65. Heading G1B. A device for introducing a gas sample into an analyzer, e.g. a mass spectrometer 6 comprises a capillary 8 connecting a source of the gas with a single intermediate chamber 9 which chamber is connected both to a vacuum pump 12 by way of a needle valve 11, and to the spectrometer 6 by way of a second capillary 10. A gauge 13 may be provided for monitoring the pressure in the chamber 9 and the spectrometer 6 is provided with its own pump 7 to draw the sample through the second capillary 10. The capillary 8 is of larger diameter than the capillary 10 and may be a metal tube, whereas the capillary 10 is preferably of molybdenum glass. The pressures in the capillaries and the chamber 9 are so arranged that the gas flow is turbulent and this ensures representative sampling. A practical construction of sampling device is described in the Specification.