Division 5.7 Fuel measurement systemF1

The fuel consumed shall be measured on-board with a measurement device reporting the total amount of fuel consumed in kilograms. The fuel measurement system shall be based on one of the following measurement methods:

1. (a)

   Measurement of fuel mass. The fuel measuring device shall fulfil the accuracy requirements set out in Table 2 for the fuel mass measurement system.

2. (b)

   Measurement of fuel volume together with correction for the thermal expansion of the fuel. The fuel volume measurement device and fuel temperature measurement device shall fulfil the accuracy requirements set out in Table 2 for the fuel volume measurement system. The fuel mass consumed shall be calculated in accordance with the following equations:

   • $m_{\mathrm{fuel}}=\sum _{i=1}^{n-1}\Delta V_{\mathrm{fuel,i}}\times {\rho }_i$

   • $\Delta V_{\mathrm{fuel,i}}=V_{\mathrm{fuel,i}+1}-V_{\mathrm{fuel,i}}$

   • ${\rho }_i=\frac{{\rho }_0}{1+\beta \left(t_{i+1}-t_0\right)}$

   where:

   m _fuel

3. Calculated fuel mass [kg]

n

4. Total number of samples in measurement.

ρ ₀

5. Density of the fuel used for the verification test in (kg/m ³ ). The density shall be determined in accordance with Annex IX of the Regulation (EU) No 582/2011. If diesel fuel is used in the verification test, also the average value of the density interval for the reference fuels B7 in accordance with Annex IX of the Regulation (EU) No 582/2011 may be used.

t ₀

6. Fuel temperature that corresponds to density ρ ₀ for the reference fuel, as defined in Annex V [°C]

ρ _i

7. Density of the test fuel at sample i [kg/m ³ ]

V _{fuel, i}

8. Total fuel volume consumed at sample i [m ³ ]

t _{i + 1}

9. Measured fuel temperature at sample i + 1 [°C]

β

10. Temperature correction factor (0,001 K ^{– 1} ).