• Measuring aromatic hydrocarbons for pollution control and environmental monitoring


The Series 8900 BTEX Analyzer provides direct measurement of Benzene, Toluene, Ethylbenzene, and Xylenes in ambient air. This instrument is utilized in ambient airnetworks around metropolitan areas and fence-line monitoring at industrial sites.

The Series 8900 BTEX Analyzer employs a photoionization detector (PID) as the sensing element. This detector is specific to volatile organic compounds. The Benzene, Toluene, Ethylbenzene, and Xylenes 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 Xylenes are separated from potentially interfering components on the analytical column and elute to the detector for analysis.


• Direct measurement of Benzene, Toluene, Ethylbenzene, and Xylenes in Ambient Air
• Interference free response
• Automatic calibration for unattended operation
• Automatic baseline adjustment for long-term stability
• Optional analog ouputs of Benzene, Toluene, Ethylbenzene, Xylenes
• Analog output ranges are user selectable
• Graphic display of current and historical concentrations
• Multipoint sampling options
• RS-232 and optional LAN


Analysis Time: Detector: PID (FID or High-sensitivity PID Optional)
Column: Capillary
Oven Temperature: 55 °C, Nominal
Carrier Gas: Nitrogen, 5.5 cc/min, Nominal
Lower Detection Limit: Accuracy: 1% of Full-scale
Precision: 2% of Measured Value
Span Drift (24HR): <2% of Full-scale
Sample Flow Rate: 250-500cc/min, typical


Analog: (1) 0-20ma or 4-20ma loop power supplied,
isolated. Selectable for: gas concentration, unintegrated detector signal. Options for up to 20 additional programmable 0-20ma, 4-20ma or voltage outputs: 0-1V, 0-5V, or 0-10V.
Digital: RS-232, optional Local Area Network
Relays: (5) User programmable relays for concentration and diagnostic alarms (1A @ 30Vdc). Options for up to 32 additional relays available.
Inputs: Optional digital input board for 3 contact closure inputs. Supports start analysis, start calibration, and analyze calibration gas sample.