Patent ID: 7877220

Claim:
An electromagnetic flowmeter assembly comprising: one or more excitation coils for generating an excitation field across a flow conduit; excitation circuitry for generating an excitation signal for application to the one or more excitation coils; one or more electrodes for sensing the electromagnetic field generated across the flow conduit as a result of interaction between the excitation field and fluid flowing along the flow conduit; processing circuitry for processing signals obtained from the one or more electrodes to determine one or more flow measurement values indicative of the fluid flow through the conduit; wherein the processing circuitry comprises a calibration data store for storing calibration data and is operable to determine said one or more flow measurement values using said signals obtained from said one or more electrodes and said calibration data; wherein the processing circuitry further comprises means for dynamically updating said calibration data; and wherein said processing circuitry is operable to calibrate a first component of the processing circuitry against a reference source and to use the calibrated first component to calibrate one or more subsequent components of the processing circuitry.