The MultiGas™ 1065-Ready HiSens analyzer is an FTIR-based multiple gas analyzer designed to meet the extremely low detection limits and strict analysis criteria for certifying N2O emissions in both light duty and heavy duty vehicle and engine testing. This same system can also be easily deployed in the field for ambient air monitoring. The analyzer was tested and validated for use in EPA 40 CFR Part 1065 and 1066 as well as Euro VI certification testing on diluted gas streams for both modal and static bag emissions. It has proven to be the most accurate and stable analyzer on the market even when going head to head with state-of-the-art, laser-based systems like QCL and TLD analyzers.
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|