The Hartridge Smoke Unit (HSU) and the Filter Smoke Number (FSN) are two systems used to measure smoke emissions in diesel engines. The correlation between HSU and FSN values is significant, as they provide different metrics for assessing smoke density. A correlation chart, which can be found on Dieselnet, illustrates the relationship between these two measurement systems, aiding in the comparison of results. Understanding this correlation is essential for accurate emissions analysis and compliance.
PREREQUISITESEngineers, emissions analysts, and automotive professionals involved in diesel engine performance and emissions testing will benefit from this discussion.