Application Note | July 24, 2009

Model 8900 Gas Chromatograph Methane/Non-Methane Application

Source: Baseline - MOCON, Inc.
The Model 8900 Methane/Non-Methane Analyzer provides direct measurement of Methane and Non-Methane Hydrocarbons. This instrument is utilized in ambient air monitoring networks around metropolitan areas, fence-line monitoring at industrial plants and hazardous waste sites and in the production of high purity industrial gases.
Methane is a naturally occurring gas generated from the decomposition of biological materials and industrial activity. Since Methane is not considered a pollutant it is the Non-Methane hydrocarbons that are of primary concern.
The Model 8900 Methane/Non-Methane Analyzer employs a flame ionization detector (FID) as the sensing element. This detector is specific to hydrocarbons. Using a single detector configuration eliminates the detector balancing, maintenance and additional fuel and combustion air of a dual detector analyzer. The Methane in the gas sample is physically separated from all other hydrocarbons using a proprietary GC column. It is then forwarded to the detector for analysis. The carrier gas flow is then reversed and the remaining hydrocarbon components recombine and are analyzed by the detector. Since the Methane and Non-Methane components are analyzed directly, a more accurate reading is obtained than by using a subtractive technique.

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