Measurement device comprising a system for mechanically uncoupling a Hall effect sensor

A device for measuring a distance between two substantially parallel surfaces of an object, the device comprising a hermetic measurement cell having:

• an outer part having a measurement surface and an inner surface, the measurement surface being configured to be a flat surface and configured to be in contact with the object to be measured;
• a measuring apparatus including a permanent magnetic field source and an electronic circuit equipped with a Hall effect sensor, wherein an output signal of the Hall effect sensor depends on a magnetic field generated via the permanent magnetic field source;
• and
• a fastening guide that exerts a force to partially hold the measuring apparatus against a sealing part of the hermetic measurement cell in a central portion closest to the measurement surface,
• wherein a variation in the magnetic field is generated when the object is resting on the hermetic measurement cell,
• wherein the sealed cavity is delimited by the inner surface of the outer part of the hermetic measurement cell and an outward surface of the sealing part of the hermetic measurement cell such that the sealed cavity is outward of the sealing part of the hermetic measurement cell and inward of both the measurement surface and the inner surface of the outer part of the hermetic measurement cell, and
• wherein the sealing part of the hermetic measurement cell has a profile that is homothetic to that of the hermetic measurement cell in its upper section located below the measurement surface.