An on-line calibration method for process gas chromatographs
- Hong Kong Univ. of Science and Technology, Clearwater Bay (Hong Kong). Research Centre
Gas chromatographs (GCs) used to measure gas concentrations in process streams usually need calibration for a wide range of concentrations. The gas chromatographs used in process applications are usually equipped with automatic samplers using sample loops. The sampling system can be modified to provide on-line calibration, by adding a vacuum system and a precision pressure gage. In this paper, the authors describe a method using pure gases for the calibration of automatic GCs by varying and measuring precisely the pressure of the sample loop, thus sending known quantities of gas into the column. The concentration of the gas is calculated using the ideal gas law, and they are able to calibrate GCs in a range from 1,000 ppm to 100 vol %.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 178436
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 34, Issue 5; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of sample loops constructed of several different materials for gas chromatographic analysis of parts-per-billion-level organic gas mixtures
A feasibility study of a pocket-sized gas chromatographic air analyzer. Final contract report