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FTIR Gas Analyzer, MultiGas™, PPB Level Engine & Vehicle Emissions


  • Measurement Technique
    FTIR Spectrometry
  • Measurable Gases & Vapors
    Most molecules except for Ar, He, 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
  • Purge Pressure
    20 psig (1.5 bar) max.
  • Spectrometer Purge Flow
    0.4 LPM of dry nitrogen or CO2 free clean dry air with dewpoints below -70°C
  • Optics Purge Flow
    0.4 LPM of dry nitrogen or CO2 free clean dry air with dewpoints below -70°C
  • Pressure Transducer
    MKS Baratron® (0-1000 Torr, i.e. 0-1.32 atm)
  • Purge Connection
    Swagelok® quick connect
  • Computer Requirements
    High speed xeon® processor (optional)
  • 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
  • Sample Flow
    3 - 25 L/min
  • Sample Pressure
    0.95 - 1.05 atm (lower pressure also possible)
  • 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
  • Mirrors
    Nickel plated aluminum substrate, with rugged gold coating
  • Windows
  • O-rings
  • 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
    0.2 - 25 LPM
  • Drift
    ≤2% of Analytical Range



The MultiGas 1065-Ready HiSens analyzer is extremely sensitive to N2 O and has no cross sensitivity to 4% moisture and CO2, up to 2000 ppm CO, or other components present in gaseous fuel emissions. A recent Light Duty vehicle round robin test sponsored by the Coordinating Research Council (CRC E-103)1 performed a series of validation tests on commercially available N2O emissions analyzers (FTIR, TDL and QCL-based) which showed that the MKS FTIR was the only analyzer that was not only within 10% of the GC-ECD reference method for all tests but also showed no bias in the readings from any other component.

The MultiGas 1065-Ready HiSens is an extremely sensitive and stable analyzer based upon the MultiGas 2030 HS High Speed analyzer. Capable of 5 Hz data acquisition at high resolution, the 2030 HS analyzer incorporates a new high-optical-throughput sampling cell with low overall volume and Dursan™ coating to minimize analyte retention. The FTIR incorporates an MCT detector that does not use liquid nitrogen (LN2 ) for cooling, but instead deploys a thermoelectric cooler (TEC) to give fast response and high sensitivity without the inconvenience and cost of LN2. This analyzer configuration, along with the software analysis package, allows for the accurate measurement not only of N2 O but also several gases found in emission streams - all at the same time - including formaldehyde, acetaldehyde, ethanol, methanol, methane, CO2 and CO, without removal of moisture.

1 ''CRC-103: Evaluation of N2 O Measurement Instruments with Light-Duty Vehicles'', by Eugene Jimenez, Janet Buckingham, Shirish Shrimpi, Donald Nagy presented at the Coordinating Research Council Real World Emissions Workshop on March 31, 2014.


The MKS MultiGas 1065-Ready HiSens analyzer outperformed many of the QCL and TDL laser based analyzers during recent EPA 40 CFR Part 1065 and 1066 testing and was the best overall system for the LD Vehicle N2O analyzer tests. The detection limits (2 sigma basis) are shown in Table 1, for the N2O response in 4% water and CO2 for a typical scan time of 1 Hz for dilute continuous (modal) gas analysis as well as a scan time of 30 seconds for the dilute bag (static) analysis. Bag analysis can also be performed using a faster 5 Hz or 1 Hz acquisition time, along with a 30 second run time average for better detection limits while still allowing the ability to see step function changes during the Bag tests. Table 2 shows the estimated 1 Hz scan time detection limits (based upon 2 sigma) for other components that can be monitored with the 1065-Ready HiSens analyzer along with N2O.

Table 1 - Detection limits for N2 O at 1 Hz and 30 second data acquisition rates in 4% CO2 and H2O

Component Scan Time Detection Limit Analytical Range
N2O (1 Hz) 1 second 25 ppb 0 - 30 ppm
N2O (30 sec) 30 seconds 3 ppb 0 - 20 ppm

Table 2 - Estimated detection limits for expandable components at 1 Hz data acquisition rates in 4% CO2 and H2O

Component Detection Limit Current Range
Formaldehyde 90 ppb 0 - 70 ppm
Acetaldehyde 250 ppb 0 - 150 ppm
Methanol 250 ppb 0 - 200 ppm
Ethanol 900 ppb 0 - 200 ppm
Methane 150 ppb 0 - 250 ppm
Ethane 150 ppb 0 - 150 ppm
Carbon Monoxide 70 ppb 0 - 2000 ppm

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