The Series 8900 BTEX Analyzer with a high-sensitivity PID provides direct low level measurement of Benzene, Toluene, Ethylbenzene, and Xylene's in ambient air. This instrument is utilized in ambient air networks around metropolitan areas and fence-line monitoring at industrial sites.

The Series 8900 BTEX Analyzer employs a high-sensitivity photoionization detector (PID) as the sensing element. This detector is specific to volatile organic compounds. The Benzene, Toluene, Ethylbenzene, and Xylene's in the gas sample are physically separated using proprietary GC columns. A dual column configuration with timed backflush to vent is used to strip off moisture and heavier hydrocarbons. A pre-cut column is used in series with the analytical column. At sample injection a fixed volume of sample is carried to the pre-cut column. Backflush is timed so that only the BTEX and other similar components are eluted to the analytical column. Contaminants on the pre-cut column are backflushed to vent. Benzene, Toluene, Ethylbenzene, and Xylene's are separated from potentially interfering components on the analytical column and elute to the detector for analysis.