Ion chromatography analysis system
An ion chromatography analysis system includes a system monitoring part being configured to detect an abnormality, to determine, based on a fluctuation rate in a certain time of the predetermined state of a most recent of the monitor value, whether the fluctuation is a short-term fluctuation that occurs in a short term or a long-term fluctuation that occurs in a long term, and to identify a cause of the abnormality by using whether the fluctuation is the short-term fluctuation or the long-term fluctuation.
1 . An ion chromatography analysis system comprising: a liquid feeding pump that feeds an eluent; a sample injection part that is fluidly connected downstream of the liquid feeding pump and is configured to inject a sample into the eluent fed by the liquid feeding pump; a separation column that is fluidly connected downstream of the sample injection part and is for separating ion components, included in the sample injected into the eluent by the sample injection part, from each other; a suppressor that is fluidly connected downstream of the separation column and is configured to remove predetermined ion components in the eluent by applying a suppressor voltage to a channel through which the eluent flowing out from an outlet of the separation column flows; a detector that is fluidly connected to an outlet of the suppressor and measures electrical conductivity of the eluent flowing out from the suppressor; and an arithmetic control device configured to monitor a base ground value of a measurement value of the detector and to manage a state of the ion chromatography analysis system based on the base ground value, wherein the arithmetic control device stores a first reference range set based on the base ground value at a time when an abnormality does not occurs in the ion chromatography analysis system and the state of the ion chromatography analysis system is a predetermined state where an eluent has been fed by the liquid feeding pump, and a second reference range which is a reference range of a fluctuation rate in a certain time of the base ground value, the arithmetic control device is configured to: compare, at a predetermined timing when the state of the state of the ion chromatography analysis system is the predetermined state, the base ground value with the first reference range and detect the abnormality when the base ground value falls outside the first reference range, in a case where the abnormality is detected, calculate the fluctuation rate of the base ground value in a most recent certain time when the state of the ion chromatography analysis system is the predetermined state, compare the calculated fluctuation rate with the second reference range, and perform identification of a cause of the detected abnormality based on whether the calculated fluctuation rate is in the second reference range or not.
2 . The ion chromatography analysis system according to claim 1 , the arithmetic control device stores a third reference range set based on the suppressor voltage at the time when the abnormality does not occurs in the ion chromatography analysis system and the state of the ion chromatography analysis system is the predetermined state, and
the arithmetic control device is configured to monitor the suppressor voltage, in the case where the abnormality is detected, to execute a determination whether the suppressor voltage at the predetermined timing is in the third reference range or not, and to use a result of the determination for the identification of the cause of the abnormality.
3 . The ion chromatography analysis system according to claim 2 , wherein the arithmetic control device is configured, when the calculated fluctuation rate is in the second reference range, to identify, as the cause of the abnormality, any one of deterioration of the suppressor and internal contamination of the suppressor depending on whether the suppressor voltage at the predetermined timing is in the third reference range or not, and is configured, when the calculated fluctuation rate falls outside the second reference range, to identify, as a cause of the abnormality, any one of a liquid passing failure to the suppressor and a wrong eluent depending on whether the suppressor voltage at the predetermined timing is in the third reference range or not.
4 . The ion chromatography analysis system according to claim 1 , wherein the arithmetic control device is configured to notify a user of the cause having been identified when and identifying a cause of the abnormality.