Gas chromatograph with carrier gas control system

Details Gas chromatograph with carrier gas control system Gas chromatograph with carrier gas control system

1998-04-14

1999-09-14

Larkin, Daniel S.

Measuring and testing

Gas analysis

Gas chromatography

73 2335, 95 82, 95 89, 96101, 96102, 422 89, 436161, G01N 3032, G01N 3086, G01N 3088

Patent

active

059525568

ABSTRACT:
A gas chromatograph includes a carrier gas supply flow path to which a pressure sensor, resistance tube, and control valve are sequentially connected. A differential pressure sensor is situated on both sides of the resistance tube to measure the differential pressure. The control valve is controlled by a controlling portion through signals from the pressure sensor and differential pressure sensor to control a flow rate of a carrier gas. Thus, in the gas chromatograph, the flow rate of the carrier gas can be controlled without an expensive pressure regulator, and a pressure of the carrier gas to be supplied can be selected as desired.

REFERENCES:
patent: 3400514 (1968-09-01), Noda
patent: 4976750 (1990-12-01), Munari
patent: 5339673 (1994-08-01), Nakagawa et al.
patent: 5467635 (1995-11-01), Nakagawa et al.
patent: 5545252 (1996-08-01), Hinshaw et al.
patent: 5711786 (1998-01-01), Hinshaw

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