An Electromagnetic Flowmeter with a Plurality of Coils

An electromagnetic flowmeter installable on a fluid carrying channel for measuring a volumetric flow of a fluid flowing within the fluid carrying channel, the electromagnetic flowmeter comprising:

• a) a measuring section configured to permit 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) a first pair of coils configured to generate a first magnetic field within the measuring section;
• and
• ii) a second pair of coils configured to generate a second magnetic field within the measuring section;
• and
• c) a transmitter which provides at least one driving current to excite the plurality of pairs of coils by providing;
• wherein the first and second pairs of coils from the plurality of pairs of coils are installed along a first plane of the measuring section, the first plane being perpendicular to the flow of the fluid in the measuring section;
• wherein the plurality of pairs of coils includes a third pair of coils configured to generate a third magnetic field;
• and
• wherein the third pair of coils is excited upon detection of an abnormal operation;
• and
• wherein the generated third magnetic field tunes at least one of the first magnetic field and the second magnetic field.

A method for measuring a volumetric flow fluid carrying channel for measuring a volumetric flow of a fluid flowing within the fluid carrying channel using an electromagnetic flowmeter, the electromagnetic flowmeter comprising a measuring section configured to permit flow of the fluid through the electromagnetic flowmeter, a plurality of pairs of coils installed on the circumference of the measuring section, and a transmitter which provides at least one driving current to excite the plurality of pairs of coils, the method comprising:

• a) providing a first driving current to a first pair of coils to generate a first magnetic field;
• b) providing a second driving current to a second pair of coils to generate a second magnetic field;
• and
• c) measuring a voltage on two or more measuring electrodes to determine a volumetric flow of fluid;
• wherein a magnetic circuit associated with the first magnetic field is distinct is from a magnetic circuit associated with the second magnetic field.