Patent ID: 7991510

Claim:
A method of measuring a flow rate of a liquid flowing in a liquid flow sensor, the liquid flow sensor including a sensor conduit and the liquid including a plurality of bubbles formed therein, the method comprising acts of: repeatedly sensing a flow signal indicative of the flow rate of the liquid flowing in the sensor conduit; calculating, responsive to the act of repeatedly sensing a weighted sum of a value of the at least one parameter of the flow signal; determining, based upon at least one parameter of the flow signal, whether at least one bubble is disposed in the liquid within the sensor conduit, wherein the act of determining includes an act of determining whether a most recently sensed value of the at least one parameter of the flow signal deviates from the weighted sum by more than a determined amount; providing, in response to a determination that no bubble is disposed in the liquid within the sensor conduit, a flow rate signal indicative of the flow rate of the liquid flowing in the liquid flow sensor based upon a most recently sensed flow signal; and providing, in response to a determination that the at least one bubble is disposed in the liquid within the sensor conduit, at least one of: a) a flow rate signal based upon the most recently sensed flow signal and an alert signal indicative of a presence of the at least one bubble, and b) a flow rate signal indicative of the flow rate of the liquid flowing in the liquid flow sensor based upon other than the most recently sensed flow signal.