Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1996-10-09
1998-09-22
Houtteman, Scott W.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 6152, B01D 1508
Patent
active
058116664
ABSTRACT:
A method for chromatographic analysis wherein an eluent is fed by a pump and a sample is injected into the eluent from a sample injector, while the composition of the eluent is changed over time. A mixture of the eluent and the sample is passed through a column, and identification of the sample is performed based on separation of the sample into components in the column. The pressure of the eluent in a feed path is detected, a pressure depending on the composition of the eluent is obtained as a reference and the detected pressure is compared with the obtained pressure. Such a comparison enables abnormality in an apparatus for liquid chromatographic analysis to be easily detected. The apparatus for carrying out the chromatographic analysis includes a pressure sensor for detecting the pressure of the eluent in a feed path, a pressure memory for storing the pressure values detected at certain time intervals from the start of measurement as a data file of pressure transition data for each sample, a selector for, when an unknown sample is measured, selecting the pressure transition data, which is to be compared as a reference, from data files store beforehand, and a comparator for comparing the pressure values of the unknown sample detected by the pressure sensor and the values of the pressure transition data selected by the selector and determining an agreement between both the values.
REFERENCES:
patent: 4117727 (1978-10-01), Friswell et al.
patent: 4414839 (1983-11-01), Dilley et al.
patent: 5610835 (1997-03-01), Dominguez et al.
Hitachi , Ltd.
Houtteman Scott W.
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