| 摘要 |
A magnetic flowmeter 10 comprises a pipe section 12 for process flow, a coil 18A, 18B for generating a magnetic field across the pipe section 12, a current source 24 for energizing the coil to generate the magnetic field at a coil drive frequency, and electrodes 16A, 16B for sensing voltage induced across the process flow by the magnetic field. A processor 22 calculates a function of the sensed voltage and generates a flow output based on the function. The processor 22 adjusts an operating parameter of the flowmeter 10, such as electrode voltage sampling period, the coil drive frequency, or a phase shift, as a function of a sensed electrode-to-electrode or electrode-to-ground complex impedance. |
