Technical Paper
Investigation into the Performance of an Ultra-fast Response NO Analyser Equipped with a NO2 to NO Converter for Gasoline and Diesel Exhaust NOx Measurements
2000-10-16
2000-01-2954
The development and optimisation of an ultra-fast response chemiluminescence NOx analyser, equipped with a high temperature stainless steel, nitrogen dioxide (NO2) to nitric oxide (NO) converter, for the transient measurement of the NOx (NO + NO2) content of automotive emissions is described. Conventional analysers routinely used to measure NOx in automotive exhaust utilise chemiluminescence detection (CLD). Ultra-fast time-scale analysis using CLD, however, has traditionally been hindered by the slow conversion of NO2 to NO. The converter and technology used in the instrument described herein enables a 10-90% response time of less than 10 ms. Following optimisation in the laboratory, the fast response CLD NOx analyser was evaluated for raw exhaust sampling of port fuel injected (PFI) gasoline and diesel vehicles.
