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SESAM i60 FT Multi Component Exhaust Measurement System
The AVL SESAM i60 FT is an FTIR multi-component measurement system that measures numerous pre-calibrated gas components in a time-synchronous and dynamic manner.
The AVL SESAM i60 FT provides optimized analysis methods for different applications and fuels. Every single FTIR comes with an individual gas calibration certificate and verified accuracy. The modular system allows for integration of optional conventional analyzers as well as a second FTIR.
SESAM i60 FT – Multi Component Measuring System
The AVL SESAM i60 FT is based on the innovative AVL i60 hardware platform which has been proven in other AVL iGeneration products. It has the same design as other iGeneration products and uses the same components wherever possible. Users having multiple iGeneration products can share spare parts and have similar maintenance procedures with reduced training effort.
The AVL SESAM i60 FT brings a new level to exhaust measurement technology, bridging the gap between R&D and certification testing. The SESAM i60 FT complies with legislative requirements such as Euro VI and EPA 40 CFR part 1065 for measurements allowing FTIR.
iGEM SESAM – Device Controller
The sophisticated iGEM SESAM control software is
The core features below highlight the power and flexibility of the system:
i60 Conventional Gas Analyzers
The AVL SESAM i60 FT is a modular system allowing for the integration of optional FID (THC) and PMD (O2) analyzers and an IRD (CO2) analyzer for EGR stream.
The AVL SESAM i60 FT creates an infrared broadband spectrum that can be used to detect all spectrum information of the exhaust gas sample at the same time. The absorption spectrum (intensity/wavelength) is calculated from the measured interferograms (intensity/time) by means of the Fourier transformation. With specifically developed evaluation methods, this absorption spectrum is used to determine the results. Optimized analysis methods have been developed for measurements on combustion engines, which, together with the long-term stable factory calibration, provide for the best possible analysis accuracy.
In contrast to conventional single-component analyzers that only operate with one wavelength, the SESAM i60 FT utilizes a broad waveband. Thus, all spectral information of the exhaust gas sample is collected simultaneously.
The standardized spectra used for this have been subject of continuous refinement over years. In addition, specific evaluation methods for automotive application have been developed that, in conjunction with the long-term stable basic calibration, results in optimum analysis accuracy.
The SESAM i60 FT large cabinet offers the possibility to integrate the following analyzers into the FTIR system:
FID – Flame Ionization Detector for THC measurement
The Flame Ionization Detector (FID) analyzer is designed for the measurements of the Total Hydrocarbon (THC) concentrations in the exhaust gas. The measuring principle is ionization of organic carbon atoms in a hydrogen flame burning in an electric field. The flame in the analyzers burner chamber cracks and ionizes the hydrocarbons in the sample gas to very small fragments. The ions are producing a current in the electric field that is directly proportional to the number of carbon atoms in the sample. The current is electrically amplified and converted to a voltage.
IRD - Infrared Detector for CO2 – EGR measurement
The Infrared Detector (IRD) analyzer can be integrated for CO2 – EGR measurements. The measuring principle of the IRD is the non-dispersive infrared absorption process. This process is based on absorption at the characteristic vibration rotation spectrum bands of non-elemental gases in the middle of infrared range between 2 and 12 µm. Gas molecules with a bipolar moment interact with infrared radiation. The photometer consists of an infrared radiation source whose emissions reach a sample cell via a chopper wheel. The sample cell is designed as a tube that is divided into a sample and reference part. The measurement effect produced in the receiver is a pressure change effect resulting from the chopper frequency, received by a diaphragm capacitor and converted into an electrical signal by an attached preamplifier.
PMD - Paramagnetic Detector for O2 measurement
The Paramagnetic Detector (PMD) analyzer is designed for measurements of the oxygen (O2) concentration in the exhaust gas. The underlying measuring principle of the PMD is the paramagnetic property of oxygen molecules in a magnetic field. The sample gas to be analyzed is lead through a sample chamber containing a dumbbell-shaped cavity made of quartz glass that is suspended on rotary tension bands. The two cylindrical dumbbell halves are inserted into an inhomogeneous magnetic field. Oxygen molecules are drawn into the magnetic field. The produced partial pressure change applies a force to the dumbbell and generates torque to move the dumbbell from its original position. The magnitude of this torque is proportional to the oxygen concentration and can be converted into an electrical signal.
The AVL SESAM i60 FT is available in the following three versions:
All versions support the following FTIR models:
SESAM i60 FT 1 Hz
In the basic version the system samples multiple components at 1 Hz scan rate with the high spectral resolution of 0.5 cm-1 with response times within 1 second. For this reason, the system is the ideal tool for analyzing the dynamic reactions e.g. in exhaust after treatment systems.
SESAM i60 FT 5 Hz
The 5 Hz version is optimized to sample multiple components every 200 ms with the high spectral resolution of 0.5 cm-1 with response times within 1 second. For this reason, the system is the ideal tool for analyzing high-dynamic reactions e.g. in exhaust after treatment systems.
SESAM i60 FT Fast Response
For a better analysis of the dynamic reactions, for example in a SCR catalytic converter, and to avoid aliasing effects caused by under-sampling a new and faster FTIR is needed. The SESAM i60 FT Fast Response samples the multiple components every 200 ms (5Hz) with the high spectral resolution of 0.5 cm-1. The high resolution is a necessity for measurements optimized for cross-sensitivity, e.g. for measuring a low concentration of NO when there is a high H2O concentration at the same time.
The higher sampling rate requires a faster infrared optic and faster measurement electronic. In addition, the computing performance had to be increased and the special gas cell and the sample gas preparation had to be optimized. The SESAM i60 FT Fast Response has a t10 - t90 time below 300 ms, compared to 1 seconds in the 1Hz/5Hz system, and a sample gas flow as low as 20 l/min.
For applications where 1 Hz sampling is sufficient, the SESAM i60 FT Fast Response version can be used in 1 Hz mode. It then calculates 1 second on average, which lowers the detection limits even more by reducing signal noise.
Areas of application
Today’s exhaust gas after treatment systems for combustion engines are more and more complex, especially since the introduction of SCR catalysts for diesel vehicles and the increased use of alternative fuels. Understanding the detailed chemical reactions in engine exhaust and after treatment systems is critical to achieve the optimal and efficient development of new components, engines, control systems and powertrains. The SESAM i60 FT provides the accurate and fast measurement of the most important exhaust gas components within one system to ideally support AVL’s customers in both R&D and certification.