Method and apparatus for calibrating a dissolved oxygen analyzer
First Claim
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1. A method for calibrating a dissolved oxygen analyzer comprising the steps of:
- setting a zero point on the analyzer by filling said analyzer with a saturated aqueous solution of an oxidizer that contains 0 ppb oxygen, setting a span point on the analyzer by first filling a sample solution in said analyzer and then flowing a cell current through a Faraday electrode until a quantity of oxygen that is not more than 10 ppb higher than an estimated oxygen content of the sample solution is obtained, and calculating a slope from said zero point and said span point.
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Abstract
A method and an apparatus for calibrating a dissolved oxygen analyzer are disclosed. In the method, a zero point is first determined and set on the analyzer by filling into the analyzer a saturated aqueous solution of an oxidizer that contains 0 ppb oxygen. A span point is then set on the analyzer by filling a sample solution in the analyzer and flowing a cell current through a Faraday electrode until a 20 ppb oxygen is produced and then setting the point as a span point for completing a two-point calibration process. A slope for calibration can be obtained between the zero point and the span point.
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10 Claims
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1. A method for calibrating a dissolved oxygen analyzer comprising the steps of:
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setting a zero point on the analyzer by filling said analyzer with a saturated aqueous solution of an oxidizer that contains 0 ppb oxygen, setting a span point on the analyzer by first filling a sample solution in said analyzer and then flowing a cell current through a Faraday electrode until a quantity of oxygen that is not more than 10 ppb higher than an estimated oxygen content of the sample solution is obtained, and calculating a slope from said zero point and said span point. - View Dependent Claims (2, 3, 4, 5)
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6. A method for calibrating a dissolved oxygen analyzer comprising the steps of:
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providing a dissolved oxygen analyzer equipped with an oxygen electrode, a Faraday electrode, a sample inlet valve, an oxidizer solution inlet valve, a reservoir for said oxidizer solution, and a sample outlet valve, closing said sample inlet valve, opening said oxidizer solution inlet valve, flowing a saturated aqueous solution of said oxidizer into said analyzer, closing said sample outlet valve, setting a reading on said analyzer to zero when said reading is established and thus establishing a zero point, flowing a sample solution into said analyzer, and flowing a current to said Faraday electrode until a 20 ppb oxygen is produced and setting said point as a span point for completing a two-point calibration process. - View Dependent Claims (7, 8, 9, 10)
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Specification