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precisive tfs tunable filter spectrometer
Optical Gas Analyzer, Tunable Filter Spectroscopy, Natural Gas Calorific Value, Wobbe Index


  • Measurement Technique
    Tunable Filter Spectroscopy
  • Measurement Ranges
    Methane: 50-100% (C1)
    Ethane: 0-20% (C2)
    Propane: 0-10% (C3)
    C4+: 0-10% (C4+ lumped)
    Carbon Dioxide: 0-20% (CO2)
    Calculated Balance: N2 (assumed for CV, WI, Density, and Specific Gravity calculations)
    Higher Heating Value (HHV)**: Per ISO 6976:2016
    Lower Heating Value (LHV)**: Per ISO 6976:2016
    Wobbe Index (WI)**: Per ISO 6976:2016
    Density: Per ISO 6976:2016
    Specific Gravity (SG): Per ISO 6976:2016
    (** Combustion reference / metering reference temperatures: 25°C / 0°C)
  • Repeatability
    Hydrocarbon Channels: ±0.05 mol% (absolute)
    CO2: ±0.05 mol% (absolute)
    HHV/LHV and WI Computation: ±0.2% (relative of reading) or ±0.1 MJ/m3 (greater of)
    Specific Gravity: ±0.05% (relative of reading)
  • Linearity Error
    <0.2% (relative of reading) or 0.1% (absolute), whichever is greater
  • Zero Drift
    Not to exceed 0.2% per month
    Maximum of 0.5% throughout life of bulb (~18 months)
  • Sample Pressure
    0.1 - 5 psig
  • Flow Rate
    0.1 - 2 L/min
  • Certifications
    CSA Class 1Div2, Groups A/B/C/D,T4. ATEx Zone 2, Ex nAnCIICT4Gc, IECEx


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