The Baseline® 9000 MNME Methane/Total Hydrocarbon Analyzer is designed for rapid measurement of the total hydrocarbons, methane, and non-methane hydrocarbon content in gas samples. The Baseline® 9000 MNME uses a flame ionization detector (FID) in conjunction with an oxidation catalyst switched in and out of a portion of the sample stream. The catalyst oxidizes all hydrocarbons except methane to produce a methane measurement. This catalytic reaction relies on the presence of oxygen (O2) in the sample. The methane value is then subtracted from the total hydrocarbon concentration to determine the non-methane hydrocarbon reading. Output options include analog, digital and logic capabilities.

The Baseline® 9000 MNME provides fast data handling and highly reproducible results. Errors commonly associated with catalyst characteristics have been eliminated providing an extremely stable and accurate signal. Because the non-methane signal is the difference in the two measured quantities, it is more stable, thus greatly reducing its systemic zero drift. The non-methane signal response factor is adjusted and thus closely correlates to the carbon number. This analytic method eliminates integration errors that can be present in gas chromatographic (GC) methods.

The Baseline® 9000 MNME can be configured with internal components for single or multi-point analysis of non-condensing gas samples. The automatic calibration feature enhances the long-term analytical stability of the instrument.

The Baseline® 9000 Methane/Total Hydrocarbon Analyzer provides access to operating parameters and concentration data through an RS-232 or Ethernet port. A simple ASCII, tab delimited protocol has been implemented. The ASCII data can be acquired by an external PC running a basic communications program such as Windows® Hyper Terminal or the analyzer can output binary or ASCII formats directly to a data acquisition system or PLC. Every Baseline® 9000 analyzer includes MOCON's free Baseline PC utility 9000 Keeper used for storing and uploading multiple methods, as well as sending configuration settings, directly to the analyzer.
Unit of Measure



  • VOC Continuous Emissions Monitoring System (CEMS)
  • Ambient Air Quality Monitoring Networks (AQM)
  • Clean Rooms (AMC)
  • Air & Oxygen Purity in Air Separation Plants
  • Features


  • Continuous hydrocarbon detection from sub-ppm to 5,000 ppm (CH4)
  • Automatic adjustment for catalyst efficiency variance
  • All concentrations reported as methane equivalent
  • Flame ionization detector
  • Graphical LED display with easy to use menu system
  • Fast (< 30 sec) reproducible response
  • Internal multi-point sampling option
  • Automatic calibration at user-defined intervals
  • Can be calibrated on a CH4 only standard
  • FlowGuard electronic control of fuel, air and sample
  • Electronic back-pressure regulator with sample bypass system
  • Discrete, multilevel concentration & fault alarms
  • Programmable analog output ranges
  • Programmable relays for diagnostics, concentration, alarms, events
  • Remote operation via RS-232 and Ethernet
  • Analytical Specifications


    N/A Flame ionization detector (FID)


    N/A Oxidizes NonMethane gasses

    Range (as Methane)

    N/A MDQ 0.03 ppm, Full-scale 1 - 200 ppm (O2 Balance) MDQ 0.06 ppm, Full-scale 1 - 200 ppm (Air Balance) MDQ 0.1 ppm, Full-scale 1 - 1,000 ppm (Air Balance)


    N/A ±1% Full-scale response


    N/A ±1% of Full-Scale over 24 hours

    Response Time

    N/A T90 < 30 sec, Switching < 3 minutes (The Sample Mode switching time is programmable)


    N/A Multilevel concentration and fault alarms that result in an audible and visually displayed alarm.
    Alarms may also be mapped to relays to control external equipment.


    N/A Internal single or multipoint modules for pre-filtered (1 micron), non-condensing samples, with or without sample pump.


    N/A Programmable automatic or manual calibration

    Support Gas

    N/A Hydrogen 35 cc/min (H2He Blend 100 cc/ min), Air 175 cc/min (typical). Hydrocarbon content must be less than 1 ppm. Fuel blend options available, consult Baseline®.

    Physical Specifications


    N/A 19.00" (48.3 cm) W x 14.25" (36.2 cm) D x 5.25" (13.3 cm) H


    N/A < 20 lb (9.07 kg)


    N/A Bench-top or 19” (48.3 cm) rack-mount, 3U


    N/A 1/4" (6.35 mm) tube fitting connectors

    Operating Temperature

    N/A 32 to 104°F (0 to 40°C)

    Operating Humidity

    N/A 0 - 95% (non-condensing)

    Electrical Specifications


    N/A 100–230 V AC, 50/60 Hz, 2 A


    N/A Graphical LCD display, 3.4” x 4.5” (8.64 x 11.43 cm)

    Relay Outputs

    N/A 5 programmable form A relays rated to 3A @ 230V AC (optional additional 9 relay output board)

    Analog Outputs

    N/A 1 programmable 0-20mA or 4-20mA isolated output (optional additional 3 analog output board)

    Digital Outputs

    N/A RS-232, Ethernet

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