Method and system for error checking an electrochemical sensor
First Claim
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1. A method for error checking an electrochemical sensor having at least two electrodes comprising:
- applying a liquid measuring medium to the electrodes;
applying an alternating voltage to a first set of the electrodes of the sensor for a first period and measuring conductivity which is used to determine a first admittance;
waiting a waiting time after said first period;
after said waiting time, applying said alternating voltage to a second set of the electrodes of the sensor for a second period and measuring conductivity which is used to determine a second admittance;
determining a value using said first admittance and said second admittance; and
providing an error message if said value is out of tolerance.
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Abstract
A method and a corresponding system for error checking an electrochemical sensor having at least two electrodes and a liquid measuring medium applied thereto are disclosed. The method involves determining a first admittance between a first set of electrodes of the sensor; determining a second admittance between a second set of electrodes of the sensor; determining a value using the first admittance and the second admittance; and displaying an error message if the value is out of a predetermined tolerance.
29 Citations
18 Claims
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1. A method for error checking an electrochemical sensor having at least two electrodes comprising:
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applying a liquid measuring medium to the electrodes; applying an alternating voltage to a first set of the electrodes of the sensor for a first period and measuring conductivity which is used to determine a first admittance; waiting a waiting time after said first period; after said waiting time, applying said alternating voltage to a second set of the electrodes of the sensor for a second period and measuring conductivity which is used to determine a second admittance; determining a value using said first admittance and said second admittance; and providing an error message if said value is out of tolerance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for error checking an electrochemical sensor having at least two electrodes comprising:
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applying a liquid measuring medium to the electrodes; applying an alternating voltage to the electrodes; determining a first admittance between a first set of electrodes of the sensor; determining a second admittance between a second set of electrodes of the sensor; determining a value using said first admittance and said second admittance; providing an error message if said value is out of tolerance; and determining if a parasitic contact resistance is out of a predetermined tolerance using a value in a target range correlated against a contact resistance between a connector in a measuring instrument checking said sensor and at least one of the electrodes of the sensor, and displaying an error message when said value is out of said predetermined tolerance for said contact resistance.
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16. A method for error checking an electrochemical sensor having at least two electrodes comprising:
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applying a liquid measuring medium to the electrodes; applying an alternating voltage to the electrodes; determining a first admittance between a first set of electrodes of the sensor; determining a second admittance between a second set of electrodes of the sensor; determining a value using said first admittance and said second admittance; providing an error message if said value is out of tolerance; and determining if a parasitic contact resistance is out of a predetermined tolerance by making a relative deviation of a coagulation time as a function of contact resistance between a connector in a measuring instrument checking the sensor and at least one of the electrodes of the sensor, and displaying an error message if said relative deviation of the coagulation time is out of said predetermined tolerance for said contact resistance.
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17. A measuring instrument for error checking an electrochemical sensor having at least two electrodes with a liquid measuring medium applied thereto, the instrument comprising:
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contacts which electrically connect to the electrodes of the sensor; electronics which generate test voltages and detect sensor signals from the electrodes; a processor programmed to; apply an alternating voltage to a first set of the electrodes of the sensor for a first period and measure conductivity which is used to determine a first admittance; wait a waiting time after said first period; and after said waiting time, apply said alternating voltage to a second set of the electrodes of the sensor for a second period and measure conductivity which is used to determine a second admittance; determine a value using said first admittance and said second admittance; and provide an error message if said value is out of tolerance; and an output unit which provides said error message.
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18. A system comprising:
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at least one electrochemical sensor with at least two electrodes; and a measuring instrument for error checking said electrochemical sensor when having a liquid measuring medium applied thereto, said instrument having; contacts which electrically connect to the electrodes of the sensor, electronics which generate test voltages and detect sensor signals from the electrodes, a processor programmed to; apply an alternating voltage to a first set of the electrodes of the sensor for a first period and measure conductivity which is used to determine a first admittance; wait a waiting time after said first period; and after said waiting time, apply said alternating voltage to a second set of the electrodes of the sensor for a second period and measure conductivity which is used to determine a second admittance; determine a value using said first admittance and said second admittance; and provide an error message if said value is out of tolerance, and an output unit which provides said error message.
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Specification