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FTIR Gas Analyzer, MultiGas™, Engine & Vehicle Emissions Measurement


  • Type
    MultiGas™ 2030 1065-Ready
  • Measurement Technique
    FTIR Spectrometry
  • Measurable Gases & Vapors
    Most molecules except for N2, H2, and O2
  • Measurable Range
    Dependent upon gas, from ppm to %. Refer to Engine and Vehicle Application Package.
  • FTIR
    2102 Process FTIR
  • Spectral Resolution
    0.5 cm-1
  • Infrared Source
    Silicon Carbide
  • Reference Laser
    Helium Neon
  • Detector
    LN2-cooled MCT, 500-5000 cm-1 (TE.cooled MCT versions available for PEMS)
  • Purge Pressure
    20 psig (1.5 bar) max.
  • Spectrometer Purge Flow
    0.2 LPM of dry nitrogen or CO2 free clean dry air with dewpoints below -70°C
  • Optics Purge Flow
    0.2 LPM of dry nitrogen or CO2 free clean dry air with dewpoints below -70°C
  • Pressure Transducer
    MKS Baratron® (0-1000 Torr)
  • Purge Connection
    Swagelok® quick connect
  • Computer Requirements
    High speed xeon® processor
  • Communication
    RJ-45 cross-over Ethernet
  • Enclosure
    19 inch rack mount chassis
  • Dimensions
    17.5 in. wide x 12.5 in. high x 25.5 in. deep
  • Power Requirements
    120 or 240 VAC, 50/60 Hz, 3 amps
  • Weight
    110 lbs. (50 kg)
  • Sample Temperature
    191°C (113°C available as well)
  • Sample Flow
    0.5 - 100 L/min
  • Sample Pressure
    0.0 - 1.3 atm (calibration pressure dependent)
    0.95 - 1.05 atm (recommended)
  • Sampling Acquisition Rate
    Dependent upon flow rate, 5 Hz @ 100 LPM
  • Sample Gas Inlet/Outlet Connection
    Swagelok® 3/8 inch, threaded
  • Gas Cell Materials
    316 stainless steel, Dursan coating
  • Gas Cell Pathlength and Volume
    5.11 m, 200 cc
  • Fittings
    3/8 inch, threaded Swagelok®
  • Tubing
    Heated 3/8 inch stainless steel inserted into compression fitting welded to gas cell
  • Mirrors
    Nickel plated aluminum substrate, with rugged gold coating with MgF2 coating
  • Windows
    ZnSe (other window material available)
  • O-rings
    Kalrez® (others available)
  • 1065-Ready Calibrations
    Instrument-independent calibrations fulfill the 1065 requirements for a large number of gases
  • Factory Calibration
    ≤2% of Reference Value
  • Accuracy
    ≤2% of Reference Value
  • Repeatability
    ≤1% of Reference Value
  • Noise
    ≤1% of Analytical Range
  • Flow Rate
    0.5 LPM up to 100 LPM
  • Drift
    ≤2% of Analytical Range


System Components

The MultiGas 2030 1065-Ready analyzer includes a 5 Hz acquisition FTIR spectrometer coupled with a patented 5.11m high-optical-throughput, low volume (200 mL) gas sampling cell. The gas cell was redesigned for increased ruggedness and corrosion resistance. It can handle up to 100 LPM, providing a true 5 Hz sampling rate along with the 5 Hz data acquisition rate. The 3/8'' inlet and outlet plumbing reduces backpressure and noise, enabling flows from 0.5 LPM up to 100 LPM while providing sensitivity that is unbeaten in the industry. The new cell has welded inlet and outlet which are more durable and resistant to leaks in cases where the gas cell needs to be cleaned frequently. The cell also includes improved insulation which ensures that the gas remains at correct temperature and that the instrument’s internal components do not overheat.

At a flow rate of 60 LPM the refresh rate of the gas sample is actually 5 Hz (gas refresh time of 0.2 sec) – providing speed and sensitivity unmatched by any other analyzer.

The MultiGas™ 2030 1065-Ready FTIR gas cell with custom heaters.

The MultiGas™ 2030 1065-Ready FTIR gas cell with new improved insulation.

High Time Resolution

Timelines of combustion gases during a 10 sec window, showing multiple component changes during the emissions test cycle. Note the different concentration profiles for each component, demonstrating the high time resolution of the analyzer

The resolution of gas profiles of the MultiGas 2030 1065-Ready has indeed been observed to exceed that of instruments running at 10 Hz and has been attributed to differences in flow rates where the 10 Hz analyzers are suffering from under sampling (low flow rate).

The MultiGas 2030 1065-Ready not only operates at a high sampling and acquisition rate but does so without sacrificing resolution. The analyzer maintains its excellent performance capabilities using high resolution (0.5 cm-1) spectra for optimum quantification of components that have high interference with water and CO2. The figure illustrates the interference effect by showing the severe overlap between NO and H2O peaks. However, due to the high resolution of the spectrum, the NO peaks can be clearly separated from the H2O peaks, which allow accurate NO quantification.

A section of the mid-IR combustion gas spectrum in the NO absorbance region is shown in the above graph with the gas sample spectrum in blue and NO reference spectrum in red.

A narrower wavenumber region is displayed in the above graph, showing the sample spectrum, an overall spectral fit.

Engine and Vehicle Application Package

Using the Engine and Vehicle Application Package, over twenty gases can be quantified simultaneously at 5 Hz with detection limits of 1 ppm or less for most components. The Application Package features multi-point calibration curves that provide large dynamic measurement ranges from low ppm to % level. This ready-to-use method offers the ability to perform analysis when CO2 and H2O levels up to 20% with no user input required. The Application Package includes 1065-compliant calibrations for many species such as N2O, NH3, CH4 and others, and is applicable for many different fuels. The Engine and Vehicle Application Package is for gas samples running at 1 atm pressure and 191°C and new 113°C calibrations are also available for use in worldwide markets.

The calibrations included in the Engine and Vehicle Application Package are applicable to all MultiGas 2030 1065-Ready analyzers because each instrument is tuned to extremely tight specifications, which allows a calibration generated on one instrument to be used on any other instrument without modification. A one-time or a regular span can however also be used for the highest accuracy requirements.

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