Gas chromatograph and method of using same

Details Gas chromatograph and method of using same Gas chromatograph and method of using same

1993-03-19

1994-08-23

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

73 2342, G01N 3010

Patent

active

053396731

ABSTRACT:
A gas chromatograph for operation in split mode is controlled by calculating the column flow rate and the total carrier gas flow rate from the length and inner diameter of the column and specified values for temperature and column inlet pressure, adjusting the split flow rate such that the pressure value measured by a pressure sensor becomes equal to the specified pressure value and control the total carrier flow rate to be equal to the calculated value therefor. In this manner, the split ratio of the gas chromatograph can be maintained easily at a specified value. The amount of carrier gas to be wasted can be significantly reduced by appropriately varying the split ratio with time during the course of an analysis.

REFERENCES:
patent: 4962662 (1990-10-01), Berger
patent: 5163979 (1992-11-01), Patrick et al.

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