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3.5
Combustion and Metering reference conditions
Combustion and Metering Reference conditions are varying by geographical location and application.
Combustion reference conditions are specified as: temperature,
t1
, and pressure,
p1
, at which the fuel is
notionally
burned
. Metering reference conditions are specified as: temperature,
t2
, and pressure,
p2
, at
which the volume of fuel to be burned is notionally
determined
. There is no a priori reason for the metering
reference conditions to be the same as the combustion reference conditions. In the BlueEye
™
Ex-D the
following reference conditions can be selected: 0/0°C, 15/0°C, 15/15°C, 20/20°C, 25/20°C at 101325 Pa and
60°F at 14.65 psi, 14.696 psi, 14.73 psi and 15.025 psi absolute.
Figure 8: Calorific value on a volume basis
–
Metering and combustion reference conditions
Figure 9: Reference conditions according to ISO 6976
The BlueEye
™
Ex-D expresses the combustion properties in all generally used metering and reference
conditions. Please ensure the correct reference conditions are selected to avoid structural offset between
BlueEye
™
Ex-D
output and comparing values.
