Cetane number reproducibility

Diesel cetane number reproducibility concerns usually develop whenever motor cetane numbers differ by more than one number. The reproducibility variation arises due to operator and engine differences. The typical reproducibility variance accepted by ASTM will change with increasing cetane number. The following reproducibility and repeatability limits have been established by ASTM for method D-613. 

Average Cetane Number Level Reproducibility Limits, Cetane Number Repeatability Limits, Cetane Number... 

Figure 10. Comparison of the residuals from the neural network model (circles) with the ASTM D613 for cetane number obtained reproducibility (dotted line).

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