Rugged dissolved carbon dioxide monitor for high purity water
First Claim
1. A method of determining dissolved carbon dioxide concentration in a sample, comprising the steps of:
- (a) measuring a first cation conductivity in the sample at a first temperature;
(b) measuring a second cation conductivity in the sample at a second temperature different from the first temperature; and
(c) determining an actual concentration of carbon dioxide in the sample in dependence upon the first and second measured cation conductivities.
1 Assignment
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Accused Products
Abstract
A continuous on-line monitor of carbon dioxide dissolved in high purity water includes a cation conductivity cell and associated bridge for measuring first and second cation conductivities at first and second temperature and a heater for heating the sample from the first to the second temperature. A microcomputer calculates first and second concentrations of a fully dissociated acid alone and carbon dioxide alone, respectively, which will produce the first measured cation conductivity at the first temperature and then determines the actual carbon dioxide concentration from the first and second concentrations and the second measured cation conductivity.
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Citations
10 Claims
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1. A method of determining dissolved carbon dioxide concentration in a sample, comprising the steps of:
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(a) measuring a first cation conductivity in the sample at a first temperature; (b) measuring a second cation conductivity in the sample at a second temperature different from the first temperature; and (c) determining an actual concentration of carbon dioxide in the sample in dependence upon the first and second measured cation conductivities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A methodf for determining carbon dioxide concentration in a sample of water used for electrical power generation, comprising the steps of:
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(a) measuring a first cation conductivity of the sample at a first temperature; (b) determining a first concentration of sulfate which alone will produce the first measured cation conductivity at the first temperature; (c) determining a second concentration of carbon dioxide which alone will produce the first measured cation conductivity at the first temperature; (d) heating the sample to a second temperature different from the first temperature; (e) measuring a second cation conductivity of the sample at the second temperature; (f) determining first and second predicted cation conductivities of the first and second concentrations of sulfate alone and carbon dioxide alone, respectively, at the second temperature; and (g) determining the actual carbon dioxide concentration in dependence upon the second concentration of carbon dioxide and differences between the second measured and first and second predicted cation conductivities.
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Specification