Continuous blending for gas analyzer calibration
First Claim
1. A method for calibrating a plurality of gas analyzers, comprising:
- providing a first gas analyzer that measures a first concentration of a first gas;
providing a second gas analyzer that measures a second concentration of a second gas;
providing a span gas that includes a mixture of said first gas and said second gas;
supplying a calibration mixture to both said first gas analyzer and said second gas analyzer, wherein said calibration mixture includes said span gas and a non-reactive zero gas; and
varying at least one of a third concentration of said non-reactive zero gas and a fourth concentration of said span gas in said calibration mixture as a function of time, wherein at least one of said third concentration and said fourth concentration is varied as a linear function of time.
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Accused Products
Abstract
A method for calibrating a plurality of gas analyzers includes providing gas analyzers that measure the concentrations of gases. A span gas includes a mixture of the gases. A calibration mixture is supplied to the gas analyzers that includes the span gas and a non-reactive zero gas. At least one of a concentration of the non-reactive zero gas and a concentration of the span gas is varied in the calibration mixture as a function of time. The gas analyzers generate sets of readings of the concentrations of the gases. A controller generates response functions of the gas analyzers based on the sets of readings. The controller determines exact concentrations of the gases in the calibration mixture based on a set of readings from a gas analyzer with a predetermined response to a gas. The controller calibrates the gas analyzers based on the response functions and the exact concentrations.
2 Citations
20 Claims
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1. A method for calibrating a plurality of gas analyzers, comprising:
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providing a first gas analyzer that measures a first concentration of a first gas; providing a second gas analyzer that measures a second concentration of a second gas; providing a span gas that includes a mixture of said first gas and said second gas; supplying a calibration mixture to both said first gas analyzer and said second gas analyzer, wherein said calibration mixture includes said span gas and a non-reactive zero gas; and varying at least one of a third concentration of said non-reactive zero gas and a fourth concentration of said span gas in said calibration mixture as a function of time, wherein at least one of said third concentration and said fourth concentration is varied as a linear function of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for calibrating a plurality of gas analyzers, comprising:
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providing a first gas analyzer that measures a first concentration of a first gas and that generates a first set of readings of said first concentration; providing a second gas analyzer that measures a second concentration of a second gas and that generates a second set of readings of said second concentration; providing a span gas that includes a mixture of said first gas and said second gas; supplying a calibration mixture to both said first gas analyzer and said second gas analyzer, wherein said calibration mixture includes said span gas and a non-reactive zero gas; varying at least one of a third concentration of said non-reactive zero gas and a fourth concentration of said span gas in said calibration mixture as a function of time; increasing said third concentration as a function of time to generate a first decreasing set of readings of said first concentration and a second decreasing set of readings of said second concentration; and decreasing said third concentration as a function of time to generate a first increasing set of readings of said first concentration and a second increasing set of readings of said second concentration. - View Dependent Claims (15)
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16. A method for calibrating a plurality of gas analyzers, comprising:
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providing a span gas supply that includes a mixture of a first gas and a second gas; providing a diluent gas supply that includes a non-reactive zero gas; providing at least one diluent flow controller that controls a first concentration of said non-reactive zero gas in a calibration mixture of said first gas, said second gas, and said non-reactive zero gas; and providing at least one span gas flow controller that controls a second concentration of said mixture in said calibration mixture, wherein at least one of said first concentration and said second concentration is varied in said calibration mixture as a function of time and wherein said at least one of said first concentration and said second concentration is varied at a rate that is slower than a decay rate of said calibration mixture.
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17. A method for calibrating a plurality of gas analyzers, comprising:
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providing a span gas supply that includes a mixture of a first gas and a second gas; providing a diluent gas supply that includes a non-reactive zero gas; providing at least one diluent flow controller that controls a first concentration of said non-reactive zero gas in a calibration mixture of said first gas, said second gas, and said non-reactive zero gas; and providing at least one span gas flow controller that controls a second concentration of said mixture in said calibration mixture, wherein at least one of said first concentration and said second concentration is varied in said calibration mixture as a function of time, wherein said function of time is linear. - View Dependent Claims (18, 19)
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20. A method for calibrating a plurality of gas analyzers, comprising:
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providing a first gas analyzer that measures a first concentration of a first gas and that generates a first set of readings of said first concentration; providing a second gas analyzer that measures a second concentration of a second gas and that generates a second set of readings of said second concentration; providing a span gas that includes a mixture of said first gas and said second gas; supplying a calibration mixture to both said first gas analyzer and said second gas analyzer, wherein said calibration mixture includes said span gas and a non-reactive zero gas; varying at least one of a third concentration of said non-reactive zero gas and a fourth concentration of said span gas in said calibration mixture as a function of time; and mathematically compensating for a time delay in acquiring at least one reading in said first set of readings and said second set of readings.
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Specification