The BevAlert Model 8900 provides direct measurement of Acetaldehyde, Benzene, Toluene, Ethylbenzene, and Xylenes (ABTEX) in Carbon Dioxide.

The instrument is utilized by Specialty Gas Manufacturers and the Food and Beverage Industry to monitor trace volatile organic compounds in CO2 used in carbonated beverages.

The BevAlert Model 8900 employs a photoionization detector (PID). The ABTEX in the gas sample are physically separated using proprietary GC columns. A pre-cut column and an analytical column with timed backflush to vent are 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 analytical column. 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.
Unit of Measure


N/A Measurement of ABTEX in beverage grade carbon dioxide.



  • Direct measurement of Acetaldehyde, Benzene, Toluene, Ethylbenzene and Xylenes in CO2
  • Automatic calibration for unattended operation
  • Automatic baseline adjustment for long-term stability
  • Analog outputs for Acetaldehyde, Benzene, Toluene, Ethylbenzene, Total Xylene concentrations
  • Analog output ranges are user selectable
  • Concentration and diagnostic alarm relays
  • Graphic display of current or historical concentrations
  • Multipoint sampling options
  • RS-232 and optional LAN

  • Specifications

    Analysis Time

    N/A 720 seconds


    N/A PID (FID or High-sensitivity PID Optional)


    N/A Capillary

    Oven Temperature

    N/A 85ºC, Nominal

    Carrier Gas

    N/A Nitrogen, 20 cc/min, Nominal

    Lower Detection Limit

    N/A <50 ppb Acetaldehyde, <2ppb Benzene, <5ppb Toluene, <5ppb Ethylbenzene, <5ppb Xylenes


    N/A 1% of Full-scale


    N/A 2% of Measured Value

    Span Drift (24HR)

    N/A <2% of Full-scale

    Sample Flow Rate

    N/A 250 - 500 cc/min, typical


    N/A Analog: (5) 0-20ma or 4-20ma loop power supplied, isolated. Selectable for: gas concentration, unintegrated detector signal. Options for up to 16 additional programmable 0-20ma, 4-20ma or voltage. outputs: 0-1V, 0-5V, or 0-10V.
    Digital: RS-232, optional Local Area Network


    N/A (5) User programmable relays for concentration and diagnostic alarms (1A @ 30Vdc). Options for up to 32 additional relays available.


    N/A Digital input board for 3 contact closure inputs. Supports start analysis, start calibration, and analyze calibration gas sample.