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precisive tfs tunable filter spectrometer
Optical Gas Analyzer, Tunable Filter Spectroscopy, Olefins and HRVOC


  • Measurement Technique
    Tunable Filter Spectroscopy
  • Measurement Ranges
    Ethylene 0 - 100%
    Propylene 0 - 100%
    Acetylene 0 - 30%
    i-Butene 0 - 20%
    1-Butene 0 - 20%
    Cis-2-Butene 0 - 20%
    t-Butene 0 - 20%
    Methane 0 - 100%
    Ethane 0 - 25%
    Propane 0 - 25%
    iso-Butane 0 - 50%
    n-Butane 0 - 50%
    i-Pentane 0 - 10%
    1,3-Butadiene 0 - 20%
  • Repeatability
  • Accuracy
    1% (absolute) or 0.2% Full Scale (greater of)
  • Zero Drift
    Not to exceed 0.2% per month (maximum cumulative drift of 0.5% over the lifetime of the infrared source)
  • Sample Pressure
    0.1 - 5 psig* (max 100 psig)
  • Sample Conditions
    0 - 50°C sample gas (gas cell heated to 60°C, not cooled)
  • Flow Rate
    0.1 - 2 L/min* (max 15 SLM)
  • Update rate
    5 seconds (default), software selectable from 1 - 120 seconds
  • Certifications
    CSA Class 1Div2, Groups A/B/C/D, T4 ATEx Zone 2, Ex, nA nC IICT4Gc IECEx


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® 5-155 Benefits

  • Analysis in seconds: Continuous measurement instead of batch handling.
  • Simple to install and maintain: No carrier gas or instrument fuel gas required for low operational costs.
  • Precision and accuracy: Accurate and reproducible results in under 5 seconds that are linear across the measurement range.
  • Flow-through sensor design: No sensitivity to pressure and flow variations which minimizes sampling issues.
  • Small footprint, outdoor rated: Extractive process mounted to replace GC installation. Process control to DCS via real-time Modbus output. CSA Class1Div2, ATEX Zone 2, IP66 rated enclosure with ATEX Zone 1 option available.

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