DMM, Dekati® Mass Monitor, is a real–time measurement instrument for monitoring PM emissions from diesel and gasoline vehicles. Used either with a tailpipe sample conditioning system or existing CVS tunnel the DMM provides second-by-second information about vehicle PM mass and number emission. In addition to particle mass concentration, DMM also provides information on particle number concentration and particle size distribution (MMD and GSD). Since the DMM is intended for daily routine usage special attention has been paid for usability issues. Ease of use, reliability and integration to test cell information and data logging systems have not compromised the accuracy and sensitivity of this system. DMM detection limit is as low as 1 µg⁄m³, time response 2–3 seconds and repeatability is better than with gravimetric measurement.
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