Method of measuring oxygen using a membrane covered polarographic electrode
First Claim
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1. A method for detecting the level of oxygen in a fluid stream which includes(a) placing an electrode in electrolytic communication with a fluid stream containing oxygen;
- (b) energizing the electrode for a first duration of time (d);
(c) preventing energization of the electrode for an interval of time (i), which is longer than the duration time (d) the electrode providing a signal corresponding to the level of the oxygen in the fluid stream to be measured;
(d) sampling repeatedly the signal generated from the electrode, which signal corresponds to time (d) at a rate and within a predetermined time such that the sampled signal when averaged produces an average signal substantially free of drift;
(e) averaging the signal so sampled;
(f) storing the signals so averaged;
(g) calculating temperature and salinity correction factors and applying said factors to the averaged signals;
(h) providing data corresponding to the level of oxygen in the fluid stream; and
(i) controlling the energization of the electrode and the sampling, averaging and storing of the signal and the application of the correction factors to the averaged signal in timed sequence.
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Abstract
An oxygen analyzer which measures the level of dissolved oxygen in a liquid stream. The measuring process embodies chronoamperoemetry of pulsed potential voltammetry. The signal from the electrode is real time averaged. The analyzer does not require temperature, salinity or pressure compensation circuitry and does not have to be calibrated repeatedly.
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Citations
7 Claims
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1. A method for detecting the level of oxygen in a fluid stream which includes
(a) placing an electrode in electrolytic communication with a fluid stream containing oxygen; -
(b) energizing the electrode for a first duration of time (d); (c) preventing energization of the electrode for an interval of time (i), which is longer than the duration time (d) the electrode providing a signal corresponding to the level of the oxygen in the fluid stream to be measured; (d) sampling repeatedly the signal generated from the electrode, which signal corresponds to time (d) at a rate and within a predetermined time such that the sampled signal when averaged produces an average signal substantially free of drift; (e) averaging the signal so sampled; (f) storing the signals so averaged; (g) calculating temperature and salinity correction factors and applying said factors to the averaged signals; (h) providing data corresponding to the level of oxygen in the fluid stream; and (i) controlling the energization of the electrode and the sampling, averaging and storing of the signal and the application of the correction factors to the averaged signal in timed sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification