Method of controlling an oxygen analyzer of the Hersch galvanic type
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United States of America Patent
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Feb 15, 2000
Grant Date -
N/A
app pub date -
Jul 25, 1996
filing date -
Jan 26, 1994
priority date (Note) -
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Abstract
The claimed invention provides an improved oxygen analyzer of the Hersch galvanic type that is suitable for measuring oxygen concentrations of 1 part per million (ppm) or less in a feed gas, as well as, methods of regulating said analyzer. Modifications have been made to the instrument, or its attendant supporting structures, that reduce or eliminate problems associated with the back flow of gas due to pressure differences between pipes for entrance and egress gases, problems associated with dead zones in the apparatus, or problems associated with dissolved oxygen present in water supplied to the detector. These problems have been addressed by modifying the instrument and its attendant structures, inter alia, to include a bypass pipe coupling between a pipe for gas supply to a detector and a pipe at gas outlet, including a check valve halfway between said bypass coupling, and providing means for detecting the pressure differential between a gas supply pipe and gas outlet pipe. Methods for regulating the flow of atmospheric oxygen into the analyzer, regulating the water level in the analyzer, and performing automatic zero and gain adjustments are also provided.
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