Electromagnetic flowmeter with primary and secondary pairs of coils

A method of operating an electromagnetic flowmeter for measuring a volumetric flow of a fluid, the method comprising:

• a) detecting an occurrence of a predefined event associated with one of (i) process equipment, (ii) at least one magnetic field generated by at least one primary pair of coils and (iii) a predefined frequency set during one of calibration of the electromagnetic flowmeter and installation of the electromagnetic flowmeter;
• and
• b) selecting at least one secondary pair of coils from the at least one group of secondary pairs of coils and at least one parameter of a driving current associated with the selected at least one secondary pair of coils from the at least one group of secondary pairs of coils to generate a secondary magnetic field;
• wherein the secondary magnetic field interacts with at least one magnetic field from the at least one magnetic field generated by the at least one primary pair of coils to improve at least one of (i) a magnetic field homogeneity of the at least one magnetic field and (ii) a magnetic gain of the at least one magnetic field;
• wherein the electromagnetic flowmeter comprises:
• a) a measuring section configured to permit a flow of the fluid through the electromagnetic flowmeter;
• b) a plurality of pairs of coils installed on a circumference of the measuring section, the plurality of pairs of coils comprising:
• i) the at least one primary pair of coils for generating the at least one magnetic field within the measuring section to measure the volumetric flow of the fluid;
• and
• ii) at least one group of secondary pairs of coils which are independently excitable in relation to the at least one primary pair of coils, the group of at least one secondary pairs of coils remaining unexcited during normal operation of the electromagnetic flowmeter;
• and
• c) a transmitter which provides at least one driving current for exciting the plurality of pairs of coils, the transmitter being configured to excite the selected at least secondary pair of coils upon detection of a predefined event associated with a measurement parameter of the electromagnetic flowmeter;
• and
• wherein the measurement parameter indicates a measurement effectiveness of the electromagnetic flowmeter and is associated with one of (i) flow profile, (ii) strength of the at least one magnetic field within a measuring section of the electromagnetic flowmeter and (iii) a condition of a process equipment.