ECA 450 OperationInstruction 0024-9400 472.17.16 High Resolution NOx EnableWhen High Resolution NOx Enable is turned ON the ECA 450 will displaythe values of NO, NO 2 and NOx at a resolution of 0.1 ppm when the values ofthese gases are <100 ppm. When a gas value becomes ≥100 ppm, theresolution for that gas switches to 1 ppm.When High Resolution NOx Enable is turned OFF, the display resolution forNO, NO 2 and NOx is always 1 ppm.Turn High Resolution NOx Enable ON or OFF as follows:1. Press SETUP key to display the Setup List screen.«««««SETUP LIST«««««Temperature UnitsPressure UnitsPollution UnitsLanguageDateTimeO2 ReferenceTest IDDisplay TimeoutDisplay FormatPrimary AirData LoggingStatisticsUser NameKeypad Soundª High Res NOX EnablPrint PressureEnhanced PrintoutInformation2. Use ∧∨ keys to place cursor next to “High Res NOX Enabl”; then pressENTER to display the High Res NOX Enable screen.3. Use ∧∨ keys to place cursor next to “On” or “Off”; then press ENTER tomake the selection and be returned to the Setup List screen.High Res NOX EnableOffª On4. Press RUN to exit the Setup List screen and display the Combustion TestHOLD screen. Combustion efficiency and emissions testing can now beperformed as described in Section 2.4 Performing a Combustion Test.
