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Title: Chromatograph Maintenance And Troubleshooting
Author: Lloyd W. Winn
Source: 2008 International School of Hydrocarbon Measurement
Year Published: 2008
Abstract: Measurement of natural gas requires a variety of instrumentation, only one of which is the gas chromatograph. The sale of natural gas is performed on the basis of the heating value per unit volume of the gas (MMBtu). For this reason the need for proper sampling and/or portable on-line instruments is needed. There are five major sources of problems in gas chromatography: 1. the operator, 2. the sample, 3. the column, 4. the equipment or electronics, and 5. the gas flow system. Eliminate these sources in a systemic manner to isolate the cause of a problem. A few basic rules make troubleshooting faster and easier. Most important are maintaining close observation of operating parameters and a good record keeping system (temperatures, flow rates, and column type are a few.) Also of primary importance are reference chromatograms and reference standards containing known concentrations of the components in your samples, with no extraneous components. Many hours can be wasted hunting problems within an instrument or column, when the problem is the sample being analyzed. If your chromatographic system separates the reference standard well and reproducibly, the problem most likely is related to the sample.

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