Editing Cetane number (section)

===Ignition Quality Tester (IQT)===
Another reliable method of measuring the derived cetane number (DCN) of diesel fuel is the Ignition Quality Tester (IQT). This instrument applies a simpler, more robust approach to CN measurement than the CFR. Fuel is injected into a constant volume combustion chamber at approximately 575&nbsp;°C and {{convert|310|psi|bar|abbr=on}}. The time between the start of injection and the recovery of the combustion chamber pressure to {{convert|310|psi|bar|abbr=on}} is defined as the ignition delay. This measured ignition delay is then used to calculate the DCN of the fuel. The fuel's DCN is then calculated using an empirical inverse relationship to ignition delay. Because of the reproducibility, material cost, and speed of the IQT, this has been the definitive source for DCN measurements of fuels since the late 2000s.<ref>Heyne, Kirby, Boehman, ''Energy & Fuels'', 2009. {{doi|10.1021/ef900715m}}</ref>
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