Electrolyte analysis device and method for identifying abnormality in same
Provided are an electrolyte analysis device and a method for identifying an abnormality in the same that make it possible to detect an abnormality in an ion-selective electrode at an early stage. The electrolyte analysis device comprises an ion-selective electrode that generates a sample potential that is a potential corresponding to the ion concentration of a sample, a reference electrode that generates a reference potential that is a potential to serve as a reference, and a concentration calculation unit that calculates the ion concentration on the basis of the potential difference between the sample potential and the reference potential. The electrolyte analysis device is characterized by additionally comprising an abnormality determination unit for determining whether there is an abnormality on the basis of an evaluation value that has been calculated using a detergent potential that is a potential generated by the ion-selective electrode when a detergent was supplied.
1 . An electrolyte analysis device, comprising:
an ion selective electrode configured to generate a sample potential that is a potential corresponding to a concentration of an ion contained in a sample;
a reference electrode configured to generate a reference potential that is a potential serving as a reference; and
a computer configured to calculate the concentration of the ion based on a potential difference between the sample potential and the reference potential, wherein
the computer is further configured to
determine whether there is a first abnormality in a high concentration region based on an evaluation value calculated using a detergent potential that is a potential generated by the ion selective electrode when a detergent is supplied;
determine whether there is a second abnormality in a low concentration region based on an evaluation value calculated using an ion concentration of a standard solution:
determine the first abnormality in the high concentration region before the second abnormality in the low concentration region; and
when the first abnormality is determined to be present, determine that the second abnormality is also present,
the computer uses, as the evaluation value, a deviation rate calculated based on the detergent potential measured every time supply and discharge of the detergent are repeated,
the computer is further configured to calculate the deviation rate by using the detergent potential in the high concentration region measured during a first detergent supply, and an average value of the detergent potentials measured after reaching a certain level during the supply and discharge of the detergent are repeated,
the computer is further configured to calculate a prediction value of the deviation rate every time after a next time, and to display a transition of the prediction value of the deviation rate, and
the computer is further configured to output a carry over abnormality indication based on the calculated prediction value of the deviation rate.
2 . The electrolyte analysis device according to claim 1 , wherein
the computer uses, as the evaluation value, a prediction value of a next deviation rate calculated based on a currently calculated deviation rate and a previously calculated deviation rate.
3 . The electrolyte analysis device according to claim 1 , wherein
the computer uses, as the evaluation value, an ion concentration calculated based on an average value of potentials measured after the detergent potential, which is measured every time supply and discharge of the detergent are repeated, reaches a certain level.
4 . The electrolyte analysis device according to claim 1 , wherein a solution containing sodium hypochlorite or sodium hydroxide is used as the detergent.
5 . A method for identifying an abnormality in an electrolyte analysis device, the electrolyte analysis device including
an ion selective electrode configured to generate a sample potential that is a potential corresponding to a concentration of an ion contained in a sample,
a reference electrode configured to generate a reference potential that is a potential serving as a reference, and
a concentration calculation unit configured to calculate the concentration of the ion based on a potential difference between the sample potential and the reference potential as a high concentration region,
the method comprising:
a step of detecting a detergent potential that is a potential generated by the ion selective electrode when a detergent is supplied;
a step of calculating an evaluation value by using the detergent potential;
a step of determining whether there is a first abnormality in the high concentration region based on the evaluation value using, as the evaluation value, a deviation rate calculated based on the detergent potential measured every time supply and discharge of the detergent are repeated;
a step of determining whether there is a second abnormality in a low concentration region based on an evaluation value calculated using an ion concentration of a standard solution, wherein the first abnormality in the high concentration region is determined before the second abnormality in the low concentration region;
a step of determining that the second abnormality is present when the first abnormality is determined to be present;
a step of calculating a deviation rate by using the detergent potential measured during a first detergent supply, and an average value of the detergent potentials measured after reaching a certain level during the supply and discharge of the detergent are repeated;
a step of calculating a prediction value of the deviation rate every time after a next time, and to display a transition of the prediction value of the deviation rate; and
a step of outputting a carry over abnormality indication based on the calculated prediction value of the deviation rate.