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Measuring nanoparticles in exhaust emissions

NanoMet3 is a new instrument for Portable Emission Measurement Systems (PEMS) application to measure number concentration and diameter of nanometer-sized particles

 

It has a compact, portable and rugged design, and provides online response. Due to these properties, it is a useful instrument for particle number concentration measurements in non-laboratory settings and even OBD instrumentation. 

It is 12V DC battery operated and therefore appropriate for onboard and field measurements. The measurement range is suitable for vehicle exhaust emission concentrations (diluted 3E3-3E8pt/cm3) and the response time is short enough to measure transient engine operation. Matter Aerosol believes that NanoMet3 is therefore the ideal candidate for in-use compliance testing, as well as for future PEMS type approval.
For certain applications, PEMS have been proven to better identify in-use performance of vehicles than standard laboratory measurements, since they are designed to measure emissions during the actual use of an internal combustion engine vehicle or equipment in its regular daily operation under real-world conditions. Furthermore, PEMS constitute a cost-effective solution to perform in-service testing of engines: rather than extracting the engines from the vehicles and then installing them on an engine dynamometer to run their official regulatory cycles, the vehicles are equipped with onboard emission measurement systems and then tested during their real in-use operation.
The PEMS methodology and approach has been recognized by many governmental entities including the US Environmental Protection Agency and the United Nations Framework Convention on Climate Change. Particle counting on diesel cars is mandatory through Euro 5B since September 2011. The European Union and other countries throughout the world will continue to integrate particle counting into their emissions standards, especially since the World Health Organization identified diesel exhaust as one of the most dangerous pollutants.
The increasing importance of accurate and cost-effective testing has become a significant issue for the industry. Vast experience in nanoparticle measuring equipment for automotive, laboratory and ambient applications has enabled Matter Aerosol to develop a rugged, portable and cost-effective solid nanoparticle counter.
When a standard dilution tunnel such as a constant volume sampling (CVS) tunnel is used for emissions testing, the volatile substances may condense into nanodroplets, which are detected as particles together with nonvolatile solid particles. To measure only the solid particle fraction, it is necessary to condition the sample thermally in order to eliminate the volatile fraction. NanoMet3 features a separate exhaust probe and control unit that effectively dilutes the sample at the source (tailpipe, CVS tunnel or stack) in order to preserve it for accurate measurement.
The portable system is completed with Matter’s proprietary Diffusion Size Classifier technology, a new sensor for measuring the number concentration and average diameter of nanometer-sized particles. Since its measuring principle uses electrical charging to count particles, it not only enhances the quality of the global measurement but also the cost of acquisition, and costs per test are significantly lower. Hydrocarbon emission measurement will no longer be affected by butanol contamination in the testing room, nor will it be influenced by contaminated air.

 

 

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