Patent ID: 9746450
Date: 2017-08-29
CPC Classifications: G01N

Claim:
1. An online gas chromatograph comprising: a sample inlet configured to receive a sample during a measurement cycle and calibration gas during a calibration cycle; at least one chromatographic column operably coupled to the sample inlet; at least one valve interposed between the sample inlet and the at least one chromatographic column; a detector fluidically coupled to the at least one chromatographic column; and a controller coupled to the detector and to the at least one valve, the controller being configured to control flow from the sample inlet through the chromatograph using the at least one valve, wherein the controller is configured to generate a plurality of sequential calibration cycles, each calibration cycle having a calibration gas purge operation and wherein a first calibration gas purge operation lasts longer than a second calibration gas purge operation.