Analyser, an analyser body and a sensor part

An analyser body comprising one or more walls, wherein at least one of the one or more walls comprising:

• a mechanical connecting surface for connecting the analyser body and a sensor part together, the mechanical connecting surface having an outer perimeter structure and an inner perimeter structure within the outer perimeter structure which the outer perimeter structure and the inner perimeter structure are arranged on the mechanical connecting surface;
• and
• a fluid coupling connectable to a corresponding fluid coupling of the sensor part for providing a fluid connection between the analyser body and the sensor part, the fluid coupling is provided within the inner perimeter structure on the mechanical connecting surface.

A sensor part comprising a sensor casing and a sensor provided inside the sensor casing, wherein the sensor part further comprising:

• a mechanical connecting surface in connection with the sensor casing for forming a mechanical connection with an analyser body, the mechanical connecting surface having an outer perimeter structure and an inner perimeter structure within the outer perimeter structure, which the outer perimeter structure and the inner perimeter structure are arranged on the mechanical connecting surface;
• and
• a fluid coupling connectable to a corresponding fluid coupling of the analyser body for providing a fluid connection between the sensor part and the analyser body, the fluid coupling is provided within the inner perimeter structure on the mechanical connecting surface.