Method and apparatus for the analysis of gas in a medium

Measuring and testing – Sampler – sample handling – etc. – Withdrawing through conduit or receptacle wall

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7386481, G01N 100, G01N 114

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active

053796543

ABSTRACT:
A method for determining the concentration of a monitored gas in the head space of a confined space containing a medium material at a given temperature (T.sub.1), includes the steps of: (a) providing an extracting apparatus having a chamber for receiving a sample volume of the material to be extracted from the confined space; (b) controlling the temperature of the chamber such that the temperature of the chamber is maintained at the given temperature (T.sub.1) of the confined space; (c) withdrawing a sample volume of the material from the confined space and into the chamber; (d) feeding a volume of inert gas into the chamber and mixing the inert gas with the material to form a mixture; (e) allowing the mixture to reach equilibrium wherein a head space of gas is formed in the chamber over the material; (f) withdrawing a first gas sample from the head space of the chamber; (g) determining the concentration of the monitored gas in the first gas sample; (h) expelling the gas from the head space of the chamber; (i) repeating steps (d)-(g) so as to determine the concentration of the monitored gas in at least a second gas sample; (j) determining the equilibrium constant of the material at the given temperature (T.sub.1) in accordance with a specified formula; and (k) determining the concentration of the monitored gas in the head space of the confined space in accordance with another specified formula.

REFERENCES:
patent: 3357232 (1967-12-01), Lauer
patent: 4403517 (1983-09-01), Thomte
patent: 4527436 (1985-07-01), Jones
patent: 5248616 (1993-09-01), Beckman et al.
Penther et al., "New Liquid-Sampling Valve Extends Usefulness of Process Chromatographs", The Oil and Gas Journal, May 15, 1961, pp. 130-133.
Warren, "Don't Sell Sampling Short-Continuous Automatic Sampling-2", The Oil and Gas Journal, vol. 54, No. 49, pp. 93-97.

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