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1. (WO2018017080) METHOD FOR PERFORMING TEMPERATURE COMPENSATION OF MAXIMUM SENSOR CURRENT AND TEST TONE AMPLITUDE DURING METER VERIFICATION

Pub. No.:    WO/2018/017080    International Application No.:    PCT/US2016/043180
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Thu Jul 21 01:59:59 CEST 2016
IPC: G01F 1/84
G01F 15/02
Applicants: MICRO MOTION, INC.
Inventors: CUNNINGHAM, Timothy J.
KEENEY-RITCHIE, Miles
Title: METHOD FOR PERFORMING TEMPERATURE COMPENSATION OF MAXIMUM SENSOR CURRENT AND TEST TONE AMPLITUDE DURING METER VERIFICATION
Abstract:
A method of determining optimal resistance and compensating for temperature variations in determining a test tone is presented. The optimal resistance in a drive circuit amplifier and drive coil and using the optimal resistance to improve the accuracy of a test tone used in the calibration of a flow meter is presented. The optimal resistance is calculated using a linear extrapolation of the resistance change of the circuit with respect to temperature. The optimal resistance is then used to calculate the proper maximum sensor current (MSC) value using an equation derived from Ohm's law, and from the MSC a test tone level is calculated.