Smart determination of dissolved oxygen probe operating bias
First Claim
1. A method for determining dissolved oxygen utilizing an oxygen probe, said method comprising the steps of:
- passing a constant current though a working electrode to establish a reference electrode voltage relative to said working electrode;
measuring said reference electrode voltage at a first current level and at a second current level utilizing said oxygen probe, wherein said first and second current levels define limitations of oxygen electrochemistry; and
calculating an optimum electrode bias voltage based on said reference electrode voltage measured at said first current level and said second level to thereby indicate dissolved oxygen thereof.
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Abstract
A method and system for determining dissolved oxygen is disclosed. One or more constant currents are driven through amperometric-type dissolved oxygen probes to develop reference electrode potentials defining the envelope of oxygen electrochemistry. The reference electrode voltage is generally measured at a first current level and at a second current level utilizing the oxygen probe, wherein the first and second current levels define limitations of oxygen electrochemistry. An optimum electrode bias voltage can thereafter be automatically calculated based the reference electrode voltage measured at the first current level and the second level to thereby provide accurate indications of dissolved oxygen thereof.
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Citations
32 Claims
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1. A method for determining dissolved oxygen utilizing an oxygen probe, said method comprising the steps of:
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passing a constant current though a working electrode to establish a reference electrode voltage relative to said working electrode;
measuring said reference electrode voltage at a first current level and at a second current level utilizing said oxygen probe, wherein said first and second current levels define limitations of oxygen electrochemistry; and
calculating an optimum electrode bias voltage based on said reference electrode voltage measured at said first current level and said second level to thereby indicate dissolved oxygen thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for determining dissolved oxygen utilizing a dissolved oxygen probe, said method comprising the steps of:
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passing a constant current though a working electrode to establish a reference electrode voltage relative to said working electrode, wherein said constant current level comprises at least one predefined current level;
measuring said reference electrode voltage at a first current level and at a second current level utilizing said dissolved oxygen probe, wherein said first and second current levels define limitations of oxygen electrochemistry; and
calculating an optimum electrode bias voltage based on said reference electrode voltage measured at said first current level and said second level to thereby provide accurate indications of dissolved oxygen thereof;
configuring said dissolved oxygen probe to include at least one amplifier, which provides a constant current source sufficient to place said dissolved oxygen probe in said constant current mode, wherein said at least one amplifier comprises a transconductance amplifier; and
adjusting said constant current level to account for temperature effects associated with said dissolved oxygen probe and a constant current selection value.
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17. A system for determining dissolved oxygen utilizing an oxygen probe, said system comprising:
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a current mechanism for passing a constant current though a working electrode to establish a reference electrode voltage relative to said working electrode;
a measurement mechanism for measuring said reference electrode voltage at a first current level and at a second current level utilizing said oxygen probe, wherein said first and second current levels define limitations of oxygen electrochemistry; and
a calculating mechanism for calculating an optimum electrode bias voltage based on said reference electrode voltage measured at said first current level and said second level to thereby provide accurate indications of dissolved oxygen thereof. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for determining dissolved oxygen utilizing a dissolved oxygen probe, said system comprising:
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a current device, wherein said current device passes a constant current though a working electrode to establish a reference electrode voltage relative to said working electrode, wherein said constant current level comprises at least one predefined current level;
a measuring device, wherein said measuring device measures said reference electrode voltage at a first current level and at a second current level utilizing said dissolved oxygen probe, wherein said first and second current levels define limitations of oxygen electrochemistry; and
a calculating device, wherein said calculating device calculates an optimum electrode bias voltage based on said reference electrode voltage measured at said first current level and said second level to thereby provide accurate indications of dissolved oxygen thereof;
said dissolved oxygen probe comprising at least one amplifier, which provides a constant current source sufficient to place said dissolved oxygen probe in said constant current mode, wherein said at least one amplifier comprises a transconductance amplifier; and
an adjusting mechanism for adjusting said constant current level to account for temperature effects associated with said dissolved oxygen probe and a constant current selection value.
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Specification