Apparatus for determining a differential zero offset in a vibrating flowmeter and related method

A method for operating a multi-fuel system, having an engine, at least two fuel tanks configured to each contain different fuels, and at least a supply-side flowmeter and a return-side flowmeter, comprising the steps of:

• recirculating a first fuel type in a closed loop while the engine is not operating, such that substantially no fuel is consumed;
• measuring a first fuel flow in the supply-side flowmeter and the return-side flowmeter;
• comparing the first fuel flow measurements between the supply-side flowmeter and return-side flowmeter, and determining a first differential zero value based on the difference in the fuel flow measurements between the supply-side flowmeter and return-side flowmeter;
• receiving a first temperature sensor signal value;
• associating the first differential zero value with the first temperature sensor signal value and the first fuel type;
• storing the first differential zero value associated with the first temperature sensor signal value and the first fuel type in a meter electronics;
• recirculating a second fuel type in the closed loop while the engine is not operating, such that substantially no fuel is consumed;
• measuring a second fuel flow in the supply-side flowmeter and the return-side flowmeter;
• comparing the second fuel flow measurements between the supply-side flowmeter and return-side flowmeter, and determining a second differential zero value based on the difference in the fuel flow measurements between the supply-side flowmeter and return-side flowmeter;
• receiving a second temperature sensor signal value;
• associating the second differential zero value with the second temperature sensor signal value and second fuel type;
• and
• storing the second differential zero value associated with the second temperature sensor signal value and the second fuel type in the meter electronics;
• wherein multiple differential zero values are determined for the first temperature sensor signal value, each at different time points, and are stored and associated with the first temperature sensor signal value.