VIBRATORY FLOWMETER AND METHODS AND DIAGNOSTICS FOR METER VERIFICATION

摘要

To provide a vibratory flowmeter that allows an operator to easily confirm whether there is a measurement error due to erosion, corrosion or other flow tube damage.SOLUTION: A vibratory flowmeter includes meter electronics 20 coupled to first and second pickoff sensors 170L, 170R and coupled to a driver 180, the meter electronics being configured to: vibrate the flowmeter assembly 10 in a single mode using the driver; determine a single mode current of the driver; determine first and second response voltages generated by the first and second pickoff sensors, respectively; compute frequency response functions for the first and second response voltages from the determined single mode current; fit the generated frequency response functions to a pole-residue model; and verify proper operation of the vibratory flowmeter using a meter stiffness value, residual flexibility, and a meter mass value.SELECTED DRAWING: Figure 1