Pressure sensor suited to measuring pressure in an aggressive environment

A facility comprising:

• a medium, a pressure of which is to be measured;
• a wall separating the medium from an external environment;
• at least one passage passing through the wall;
• and
• at least one pressure sensor configured to measure at least low pressures, comprising a body extending in a sensor plane, the body comprising a first end and a second end, a measurement zone, located at the first end of the body, a connection zone located at the second end of the body, the measurement zone comprising at least one cavity delimited by at least one wall being movable or deformable under effect of a pressure difference between inside of the cavity and an external medium, the movable or deformable wall being located at least at rest in a plane parallel to the sensor plane;
• the pressure sensor further comprising:
• a measurement device measuring displacement or deformation of the movable or deformable wall, the measurement device being located in the cavity,
• at least one electrical connector connecting the measurement device to the connection zone, the at least one electrical connector being disposed in the body, the body configured to be disposed at least partly in the medium such that the first end is in the medium, and the connection zone configured to be insulated from the medium to allow an electrical connection with an external environment separated from the medium,
• in the body, a fluid channel between the cavity and the connection zone to connect the cavity to the external environment,
• the sensor being a relative pressure sensor for relative pressure between the external environment and the medium to be measured, the body of the sensor being sealingly mounted in the passage through the wall such that the measurement zone is in the medium and the connection zone is in the external environment.