Microbubbles in the permeate lines at a water utility in southern Florida caused highly erratic and inaccurate flow measurements. This flow measurement is of prime importance to the water utility because it:
A new FSM4000 electromagnetic flowmeter (magmeter) recently installed at the utility has an unusual design that combines the advantages of AC and DC excitation. The new flowmeter, made by ABB Instrumentation (Warminster, PA), offers a steady, accurate, and responsive flow reading regardless of flow disturbances caused by the microbubbles and line noise. It also eliminates the zero shift usually associated with AC magmeters.