8900GC Application Note: ABTEX

The BevAlert Model 8900 employs a photoionization detector (PID). The ABTEX in the gas sample are physically seperated using proprietary GC columns. A pre-cut column and an analytical column with timed backflush to vent is used to strip off moisture and heavier hydrocarbons. At sample injection, a fixed volume of sample is carried through the pre-cut column. The backflush is timed so that only the ABTEX and other similar compounds continue on to the analyticalcolumn. Contaminants on the pre-cut column are simultaneously backflushed to vent. Acetaldehyde, Benzene, Toluene, Ethylbenzene, and Xylenes are separated from potentially interfering components on the analytical column and elute to the detector for analysis.