Precisive TFS

Precisive® TFS™ Tunable Filter Spectroscopy

Natural Gas Quality, C1-nC6 Hydrocarbon Composition, and BTU/Wobbe Monitoring

The MKS Precisive® product platform of innovative optical analyzers based on Tunable Filter Spectroscopy (TFS™) provides real-time gas analysis in the natural gas and hydrocarbon processing industries, including refineries, hydrocarbon processing plants, gas-to-power machines, biogas processes and fuel gas transportation and metering, while delivering customers a substantially lower total cost of ownership. Precisive® TFS™ can be utilized from UV (Ultra-Violet) through IR (Infra-Red) spectral regions. The Precisive® TFS™ sensor platform has been on the market since 2008 with more than 2500 systems deployed.

Precisive® optical sensors are the first widely deployed hydrocarbon composition monitors to feature real-time unattended analytics with hydrocarbon speciation capability equivalent to traditional Gas Chromatography (GC) instruments yet, with much lower cost of ownership.

Now a part of MKS Instruments, the Precisive® TFS™ sensor platform will be further developed for trace/ppm through bulk/% applications where a multi-component, low-maintenance, stable analytical sensor-transmitter is required that is well positioned between traditional NDIR (Non-Dispersive Infrared) and laboratory-grade FTIR (Fourier Transform Infrared).


  • GC-like analysis in seconds. Real-time, continuous measurement. Fast response engine and turbine control
  • No carrier gas or fuel gas requirements. Low operational costs & infrastructure requirements. Suitable for small-scale plants and terminals. Ideal for remote installations
  • Robust calibration. Reduced maintenance and operational costs.
  • Flow-through sensor design. Minimized potential sampling and phase change issues
  • Compact, outdoor rated, low power. Well suited for transportable spot check applications. NEMA4X, IP66, can be engine or manifold mounted. Engineered to withstand vibration and shock


  • Custody Transfer and Fiscal Metering
  • Fuel analysis for engine control and tuning (gas turbines, internal combustion engines, fuel cell power plants, etc.)
  • Calorific value measurement for fiscal metering of pipeline gases
  • Wobbe Index meter for combustion control applications
  • Check metering, blend monitoring, fast-response BTU monitoring
  • Biomethane monitoring
  • Grid injection control
  • Fast-response alternative to traditional calorimeter and/or gas chromatograph type instruments
  • Methane Number Calculation
  • Peak shaving
  • Semiconductor gas measurement and blending

Download data sheet for more information