6.4.4 Ambient condition measurements
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6.4.4 Ambient condition measurements

  6.4.4.1 Table 8 lists the ambient condition parameters that shall be measured, or calculated, and recorded at each mode point during onboard NOx monitoring.

Table 8 - Ambient condition parameters to be measured and recorded

Symbol Parameter Dimension
H a Absolute humidity (mass of engine intake air water content related to mass of dry air) g/kg
p b Total barometric pressure (in ISO 3046-1, 1995: px=Px=site ambient total pressure) kPa
T a Temperature at air inlet (in ISO 3046-1, 1995: Tx=TTx=site ambient thermodynamic air temperature) K
Parent topic: 6.4 Direct measurement and monitoring method
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