Device for Precise Particle Measurement in Diesel and Gasoline Exhaust

Particle Measurement System MPM-4. Small, easy-to-handle, reliable for the workshop (PresseBox) (Haldenwang, ) Introduction

MAHA has developed the new MPM 4 measurement unit for this purpose.

It replaces the previous model DPMS-04. Its extreme measurement accuracy is a distinguishing feature. The unit is extremely small (about the size of a shoe box) and therefore easy to handle and - most importantly - reliable in everyday workshop usage. Its price is competitive with traditional exhaust gas measurement equipment. This innovation also demonstrates MAHA's capacity for developments involving general vehicle inspections, which is part of its top future objectives.

Measurement Principle and internal MAHA Development

The measurement procedure analyzes the exhaust flow. The particle concentration is displayed as mg/m3. As a result of many years of devel opment at MAHA, a principle of measurement and a device have been produced which can detect the tiniest particles (larger than 100 nm) in the exhaust flow with sufficient accuracy, determining their concentration by electronic processing and displaying the resulting concentration. In the applied principle, the opacity measurement (exhaust turbidity) has been expanded by the use of laser technology (laser light scattering photometry) detecting the finest particulate matter and improving accuracy greatly. The greater precision and reliability has been proven in comprehensive test series. In 2004 MAHA completed a concept study on the measurement of fine particulate in diesel exhaust. MAHA made excellent use of its time after this to create an optimum device with superior user friendliness.

The Importance of Precise Measurement

The effective, precise determination of fine particulate in the exhaust of diesel vehicles commonly in use serves, on the one hand, to protect human health. Recognized exposure limits which can endanger health can now be quantified. On the other hand, only in this manner can the statutory limits - which may become stricter in the future - be measured. The basic principle that only accurate measurement results allow meaningful eval - uations also applies here.

The "German Environmental Support Association" (DUH) recently demanded that beginning this year diesel engine particle exhaust measurement should become a part of the standard program in the routine emission inspection procedure. (AU) In consultation with MAHA specialists, it was confirmed for the DUH that devices and procedures suitable for general application at AU inspection stations would be available.

Diesel Engines (it is important to remember that this not only includes cars, but the large number of trucks and other commercial vehicles) Diesel engines in newer vehicles inherently have lower emissions. The poorer exhaust quality of older engines or the effectiveness of particle filters can now be proven more accurately than ever before. It has been found that the emission values of engines can be reduced up to 80% with good maintenance and repair and that properly functioning filters remove more than 95% of the particles generated. The MPM 4 is the ideal device for proving such qualities.

MAHA Universality
The MPM 4 from MAHA is thus not only an effective measuring unit for the current evaluation of individual engines, but also demonstrates MAHA's intention to expand its product range for exhaust measurement technology and its ability to do so. Moreover, this measurement method is already in use by the Australian government as a measurement tool for identifying diesel particle concentration and thereby fighting air pollution. MAHA's presentation of this device in Berlin at the beginning of June 2007 at the "Environmental Week" proved to be effective public relations.

Project California
Starting in May 2008 the authorities in California have started work on a project using MAHA's MPM 4 to measure fine particulate concentration in gasoline and diesel exhaust.


MAHA Maschinenbau Haldenwang GmbH & Co. KG
Hoyen 20
D-87490 Haldenwang
Hans-Peter Gorbach
MAHA Maschinenbau Haldenwang GmbH & Co. KG


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