System and method for measuring flow

A system for determining a flow rate of a fluid, comprising:

• a primary flow measurement system;
• a first flow passage to direct fluid from a fluid source to the primary flow measurement system;
• a secondary flow measurement system in parallel with the primary flow measurement system;
• a second flow passage to direct fluid from the fluid source to the secondary flow measurement system;
• a controller coupled to the primary flow measurement system and the secondary flow measurement system, the controller comprising:
• a processor;
• a memory accessible by the processor, the memory storing a set of computer instructions comprising instructions executable by the processor to:
• determine a flow rate using the primary flow measurement system;
• and
• determine the flow rate using the secondary flow measurement system.

A system of determining a flow rate of a fluid comprising:

• a constant volume chamber;
• a sonic nozzle in parallel to the constant volume chamber;
• one or more valves configured to direct a flow of a fluid to the constant volume chamber and the sonic nozzle;
• sensors configured to read one or parameters of the fluid in the system;
• and
• a controller coupled to the sensors configured to receive measurements from the sensors, the controller comprising:
• a processor;
• a memory accessible by the processor, the memory storing a set of computer instructions comprising instructions executable by the processor to:
• determine a flow rate based on one or more parameters of fluid as the fluid accumulates in the constant volume chamber;
• and
• determine the flow rate as the fluid flows through the sonic nozzle.

A method of determining a flow rate of a fluid comprising:

• supplying fluid to a constant volume chamber;
• supplying fluid to a sonic nozzle in parallel with the constant volume chamber;
• for a first mode of operation, calculating the flow rate as fluid accumulates in a constant volume chamber for a first range of flow rates;
• and
• for a second mode of operation, calculating the flow rate as the fluid flows through the sonic nozzle for a second range of flow rates;
• and
• switching between the first mode of operation and the second mode of operation.