A method to determine a time-of-flight of an integrated flow meter, the integrated flow meter including a housing having an inlet port and an outlet port, and a plurality of flow tubes connected in parallel to each other, wherein each of the flow tubes includes at least two transducers to measure upstream and downstream time-of-flight, wherein each of the flow tubes include at least one outlet connected to the outlet port of the housing via an outlet channel, and a controller connected to each of the transducers of the flow tube, the method, comprising:
- measuring the time-of-flight in a flow tube among the plurality of flow tubes for a predetermined time using the at least two transducers,
- toggling between the transducer of each of the flow tubes to measure the remaining flow tubes of the plurality of flow tubes within the predetermined time, and
- determining an overall flow rate of the plurality of flow tubes in the integrated flow meter.