The BevAlert® Model 9100 provides a total sulfur measurement for sulfur compounds in beverage-grade carbon dioxide, CO2 (ISBT Method 13). The measurement includes organic sulfides, sulfur dioxide, carbonyl sulfide, and hydrogen sulfide.

The instrument is utilized by specialty gas manufacturers and the food and beverage industry to monitor sulfur compounds in CO2 used in carbonated beverages. The gas chromatograph adheres to the stringent guidelines and methodologies established by the International Society of Beverage Technologists (ISBT) to monitor the most critical trace impurities.

The sample entering the GC is passed through a proprietary catalyst where sulfur containing compounds are reduced to hydrogen sulfide, H2S. The BevAlert Model 9100 employs a photoionization detector (PID) for detection of the H2S in the reduced sample stream. A dual column configuration with timed backflush to vent is used to strip off moisture and heavier gases. At sample injection, a fixed volume of sample is carried through the pre-cut column. The backflush is timed so that the H2S elutes to the analytical column. Contaminants are then backflushed to vent. Hydrogen sulfide is separated from potentially interfering components on the analytical column and elutes to the detector for analysis.
Unit of Measure


N/A Measuring total sulfur content in beverage-grade carbon dioxide, CO2.



  • Total measurement of organic sulfides, SO2, COS, and H2S
  • Interference free response
  • Automatic baseline adjustment for long-term stability
  • Automatic calibration
  • Analog output ranges are user selectable
  • Concentration and diagnostic alarm relays
  • Multipoint sampling options
  • Graphic display of current or historical concentrations
  • RS-232 and optional LAN

  • Specifications

    Analysis Time

    N/A 240 seconds


    N/A PID (High-sensitivity PID Optional)


    N/A Capillary

    Oven Temperature

    N/A 65-75 °C, isothermal

    Carrier Gas

    N/A Hydrogen, 6 cc/min, 30 cc/min for reactor, Nominal

    Lower Detection Limit

    N/A <20 ppb as Hydrogen Sulfide (High-sensitivity PID <1 ppb as Hydrogen Sulfide optional)


    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 200 cc/min.


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


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


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

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