Engine Exhaust Particle Measurement System (EEPMS) 3095

Based on more than 15 years of experience in the characterization of transient particle size distributions from internal combustion engines, TSI has combined the well-known Engine Exhaust Particle Sizer (EEPS™) 3090 with the Porous Tube Thermodiluter (PTT) 3098, to work as one integrated system known as the Engine Exhaust Particle Measurement System (EEPMS) 3095.

The new 3095 system addresses the industry’s need for robust and repeatable measurements that are in excellent agreement with PMP-compliant instruments. This is achieved by an integrated sample conditioning system consisting of two porous tube diluters and a volatile particle remover with full characterization and integration of the particle size dependent losses from the point of sampling to the EEPS. Based on the emerging requirements to measure solid particles below 23 nm in diameter, the system has been optimized to substantially reduce particle losses. It can either be addressed through the user friendly EEPS-Software that has been extended to fully control the complete system or it can be integrated in the test bench host system through AK-protocol. In both cases, the full time resolution of 10 Hz is provided. The sampling system provides full control no matter whether the point of sampling is at 500°C, and up to 3 bar or at ambient temperature and pressure.  Ease of use and simple maintenance were the main drivers during instrument development in order to offer maximum up-time for measurements, and minimum time for preventive maintenance.

Two porous tube diluters in combination with a catalytic stripper allow the user to select a dilution ratio from as low as 10:1 to as high as 500:1 with well-defined low particle losses. The diluters do not have any moving parts and have very low particle losses thanks to the clean air wall flow. The clean dilution air is supplied by high-accuracy mass flow controllers that are referenced to each other by a patent pending, proprietary mirroring technique. A heated sample line supplied with the system transports the exhaust sample from the primary diluter to the catalytic stripper.  A high total penetration of more than 50 % even at particle sizes below 10 nm result in very accurate size distribution measurements without post-data processing over the full particle size range from 5.6 nm to 560 nm, and over the full concentration range from > 10,000 #/cm³ to < 5x10⁸ #/cm³.

Applications

• Sub-23 nm solid particle emissions for post Euro 6 engines
• Cold start engine emissions in Gasoline Direct Injection (GDI) engines
• Exhaust after-treatment (DPF or GPF) characterization. Pre-DFF/GPF sampling with optional Pressure Reducing Module (PN 3098-PR)
• Non-exhaust nanoparticle emissions (brake and tire wear)
• Measurement of non-volatile PM emissions from aircraft turbine engines
• Non-road mobile machinery emissions

Features and benefits

• Robust dilution design: porous tube diluters without moving parts to wear out or small orifices to clog
• PMP-type (hot dilution-catalytic stripper-cold dilution) sample conditioning at ambient pressure for measurement of solid particles at 10Hz
• Low thermophoretic and diffusional losses that are corrected for in the measured size distribution
• Low cost of ownership with swappable flow controller module (only flow control module needs to be calibrated annually)
• AK-serial command protocol for integration in test cell systems with host controller
• Reliable and accurate dilution performance: well controlled/stable/accurate dynamic dilution ratio
• Easy to use: Integrated control of PTT diluter and EEPS spectrometer from single user interface