Shimadzu Corporation

Yoshihiro Hayakawa

Yoshiaki Maeda

Morimasa Hayashi

Yoshiyuki Watabe

Tetsuo Iida

An analyzer control systemfor monitoring and controlling an analyzerincludes: a plurality of sensors for detecting the condition of each component of the analyzer; a potential problem inference sectionfor receiving detection results obtained with all or part of the sensors and for inferring whether or not the analyzer is in a potentially problematic condition; and a potential problem display sectionfor showing, on a display screen, information on the potentially problematic condition. The 'potentially problematic condition' is neither a condition in which the analysis data being collected by the analyzer are unusable, nor a condition which requires deactivation of the analyzer; it is a condition in which the analyzing operation may be continued for the time being, although the analyzer is likely to soon fall into the aforementioned situations if the operation is further continued. The already collected data can be properly used.

Liquid chromatograph analyzer control system

In order to obtain a temperature gradient elution method which is rapid and accurate, a mobile phase () is supplied through two mobile-phase flow channels () and (), mixed together, and introduced into the column () while the column () is made adiabatic. In this operation, the temperature of the mobile phase in one mobile-phase flow channel, i.e., the channel (), is regulated to a constant temperature higher than the upper limit of the target temperature range to be obtained in the column (), while the temperature of the mobile phase in the other mobile-phase flow channel, i.e., the channel (), is regulated to a constant temperature lower than the lower limit of the target temperature range in the column (). By controlling the flow rates in the two mobile-phase flow channels () and (), the proportion in which these mobile-phase portions are mixed is changed with time to thereby change the temperature of the mobile phase in the column () with time. The temperature gradient elution method is thus conducted.

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Ibaraki, Japan

Yoshihiro Hayakawa