Patent ID: 7267531

Claim:
A method of controlling a peristaltic pump so as to deliver a particular amount of liquid product, comprising: driving a motor so as to operate the pump and to thereby deliver the liquid product from a source to a receiving location; monitoring a drive current of the motor so as to track rotation of the pump's rotor; counting units of rotation of the pump's rotor; and stopping the motor when the counted units of rotation reach a specified target count value, the specified target value corresponding to a total amount of liquid product to be delivered; the monitoring and counting operations including: detecting when the monitored drive current falls below a first threshold; detecting when the monitored drive current rises above a second threshold, wherein the second threshold is higher than the first threshold; and updating the counted units when the monitored drive current rises above the second threshold after having fallen below the first threshold, or when the monitored drive current falls below the first threshold after rising above the second threshold.