Coriolis measuring sensor and coriolis measuring device having a coriolis measuring sensor

A Coriolis sensor of a Coriolis measuring device for measuring a mass flow rate or a density of a medium flowing through measuring tubes of the Coriolis sensor, the Coriolis sensor comprising:

• at least one pair of measuring tubes adapted to convey a medium therethrough;
• a support body configured to support the measuring tubes;
• at least one exciter configured to excite vibrations in the measuring tubes;
• and
• for each measuring tube pair, at least two electromagnetic sensors configured to detect the measuring tube vibrations,
• wherein the measuring tubes of a respective measuring tube pair are symmetrical relative to a respective center plane in a rest position, wherein the measuring tubes of each measuring tube pair are configured to execute vibrations perpendicular to the respective center plane and to vibrate in opposite directions,
• wherein:
• each electromagnetic sensor includes at least one magnet device, each including a permanent magnet and two coil devices, each including a coil;
• the at least one magnet device is configured to be moved relative to at least one coil device by the measuring tube vibrations;
• cross-sectional surfaces of the coils are parallel and equal to each other and have an overlap of at least 90% with respect to their surface dimensions in a projection onto each other;
• mutually facing sides of the coils each define a first end face, wherein the first end faces define a coil distance, wherein a ratio of a cross-sectional surface area to a square of the coil distance of respective coils is greater than 10;
• the coils each have an inner end facing the respective other coil and an outer end facing away from the respective other coil, and wherein the coils each have a winding direction;
• a negative winding coefficient defines an opposite winding direction of the coils, and wherein a positive winding coefficient defines to a same winding direction of the coils, wherein a first sign is defined by whether the winding coefficient is negative or positive;
• the coils are connected to each other in series via either their inner ends or their outer ends, wherein a positive circuit coefficient defines an interconnection of the coils via both inner ends or via both outer ends, wherein a negative circuit coefficient defines an interconnection of the coils via one inner end and one respective outer end, wherein a second sign is defined by whether the circuit coefficient is negative or positive;
• a product of the first sign and the second sign is negative;
• and
• the permanent magnet of the at least one magnet device is:
• configured to generate, in the region of the coils, an inhomogeneous magnetic field having a field component perpendicular to the cross-sectional surfaces of the coils;
• and
• includes a second end face directed toward the coil devices and extending parallel to the cross-sectional surfaces of the coils, wherein a size of the second end face deviates by at most 50% from a size of the first end face.