Standard Procedure for the Measurement of Particle Number in Vehicle and Engine Exhaust
The standard will provide guidance on best practices to ensure consistent, high quality measurements of Particle Number from both raw and dilute vehicle and engine exhaust streams. Key elements will include proper positioning of sample probes, conditioning of sample streams and maintenance.
Rationale: US emissions standards measure particulate mass through gravimetric methods while European Union emissions standards have added particle number count. Development engineers and researchers have adopted particle counting instruments to assist in the development of engines and vehicles that meet EU regulations and have begun using them to correlate to gravimetric mass measurements. To ensure consistent measurement quality and comparable results, these development engineers have requested guidance from the manufacturers on the best practices to employ when setting up, maintaining and using these devices.