PMPD System

Dilution system to remove volatile particles and to dilute highly concentrated aerosols for PMPD applications

Dilution system ejector for the PMP application with dilution factor 1:100
Dilution system ejector for the PMP application with dilution factor 1:1000

The PMPD dilution system is used for emission measurements of vehicles and jet engines.

The PMPD system is a dilution system according to the ejector principle specially developed for the PMP application or the PMP measurement chain.

The Particle Measurement Programme or PMP is a program for advancing the particle measurement technique for particulate vehicle exhaust gases.

The PMPD consists of a vaporization line heated to 200 °C, a dilution line also heated to 200 °C, and the thermodiluter to remove volatile particles, followed by a second unheated dilution step. Each dilution step has a dilution factor of 1:10, corresponding to a total dilution factor of 1:100.

The efficiency of removing volatile particles was determined at METAS with 30 nm sized tetracontane (C40H82) droplets in accordance with "VPR Calibration Procedure AEA / ED47382 / Issue 5" (Volatile Particle Removal Efficiency) and is 0.99967.

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