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Reports in the literature indicated several factors that can influence the accuracy of Coriolis Effect mass flow meters. A Coriolis Effect mass flow meter is used to verify tractor manufacturer‘s fuel consumption claims at the Nebraska Tractor Test Laboratory (NTTL). The accuracy requirement placed on the flow meter by the Organization for Economic Co-operation and Development (OECD) in the Code 2 tractor performance test procedure is not clear, but in the most conservative interpretation is ±0.5% of each flow rate measured. Results showed a dynamic weighing calibration method was not accurate enough to obtain a calibration of the flow meter to the desired accuracy level. A static weighing calibration method developed showed no significant difference between the calibration determined by the flow meter‘s manufacturer with water and the calibration determined by NTTL with No. 2 diesel fuel. Static weighing calibration tests showed that for flow rates at or above 32 kg/h, the flow meter met the ±0.5% error most conservative interpretation of tolerance on flow rate from OECD Code 2.

Calibration Procedure for Fuel Flow Meters at the Nebraska Tractor Test Lab