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precisive tfs tunable filter spectrometer
Optical Gas Analyzer, Tunable Filter Spectroscopy, Syngas Composition


  • Measurement Technique
    Tunable Filter Spectroscopy
  • Measurement Ranges
    Calorific Value (CV)**: Per ISO 6976:1995
    Wobbe Index (WI)**: Per ISO 6976:1995
    Methane: 0-25%
    Ethane: 0-25%
    Ethylene: 0-20%
    Acetylene: 0-5%
    Carbon Monoxide: 0-50%
    Carbon Dioxide: 0-50%
    Calculated Balance: N2 (assumed for CV and WI calculations)
  • Repeatability
    Hydrocarbon Channels: ±0.05 mol% (absolute)
    CO2: ±0.05 mol% (absolute)
    CV/WI Computation: ±0.05% (relative of reading) or ±0.01 MJ/m3 (greater of)
    Specific Gravity: ±0.05% (relative of reading)
  • Accuracy
    Hydrocarbon Channels: ±0.2 mol% (absolute) or 1% relative (greater of)
    CO2: ±0.2 mol% (absolute) or 1% relative (greater of)
    HHV/LHV and WI Computation: ±0.25% (relative of reading) or ≤0.14 MJ/m3 (greater of)
    Specific Gravity: ±0.2 (absolute)
  • 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


Precisive TFS™ Light Absorption Spectroscopy Schematic

Simplified schematic of light absorption spectroscopy

The Precisive TFS™ (Tunable Filter Spectrometer) sensor platform consists of a light source, a sample cell (for gases, liquids or solids), a wavelength separating element (spectrometer) and a photo-detector. The wavelength separating element "slices" the wavelength components of the broadband light source which then interacts with the sample molecules. Some of the wavelength components are absorbed and some are transmitted through without any absorption.

Advanced Spectral Decomposition Algorithm

Light absorption spectroscopy with advanced spectral decomposition algorithm

Precisive TFS™ Tunable Filter Spectrometers use an advanced spectral decomposition algorithm. The resulting spectrum is called absorption spectrum, which acts as "fingerprints" which are used to identify the sample components and/or quantify the composition of the sample.

Precisive® 5-271 Benefits

  • Analysis in seconds: Real-time, continuous measurement with fast responce time.
  • No carrier gas or fuel gas requirements: Low operational costs and infrastructure requirements make it suitable for small-scale plants and terminals and ideal for remote installations.
  • Robust calibration: Reduced maintenance and operational costs.
  • Compact, outdoor rated, low power: NEMA 4X and IP-66 rated enclosure is suitable for engine or manifold mounting, and engineered to withstand vibration and shock.

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