CPC G01N 30/32 (2013.01) [G01N 2030/326 (2013.01); G01N 2030/328 (2013.01)] | 11 Claims |
1. A liquid chromatographic apparatus comprising:
a liquid feeding pump to feed a solvent;
an injector to inject a sample into the solvent fed from the liquid feeding pump;
a separation column to receive the solvent and the sample through the injector and separate the sample to components;
a detector to detect the components supplied from the separation column;
a pressure sensor to measure a pressure in a solvent flow channel of the liquid feeding pump; and
a controller to control operation of the liquid feeding pump,
wherein the controller: controls purge operation that is operation of removing air bubbles in the solvent flow channel by the liquid feeding pump; judges whether or not a pressure change amount in the solvent flow channel measured by the pressure sensor is a specified change amount or larger in the purge operation; and completes the air bubble removal operation when the pressure change amount is the specified change amount or larger, and
wherein the liquid feeding pump has a purge valve having a plurality of ports and switching to a position of feeding the solvent to the injector, a discarding position, or a closed position, and the controller switches the purge valve to the closed position when a number of times that the pressure change amount in the solvent flow channel is not less than specified times an average pressure change amount within a specified time is less than a specified consecutive number of times and switches the purge valve to the discarding position when the pressure in the solvent flow channel exceeds a set pressure.
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