Flange set for a differential pressure sensor with two side flanges (1, 49, 57) which can be mounted on exterior sides of a measuring system of the differential pressure sensor, said sides being located opposite one another and each comprising a membrane that is to be subjected to a pressure, wherein said side flanges - each comprise a side wall which, when mounted, covers one of the two membranes of the measuring system and encloses a pressure chamber adjacent to the respective membrane, and - each comprise a first process connection arranged on a first of four front faces of the side wall, said front faces being located opposite one another in pairs, wherein said process connection comprises a pressure channel connection area into which a pressure channel enters, said pressure channel running through the side flange to the pressure chamber, wherein - the first process connections are designed in such a way that a differential pressure sensor equipped with the flange set can be mounted and connected on a process connection via the first process connections, said process connection having a first process connection geometry designed for the connection and mounting of differential pressure sensors with two membranes located on the same exterior side of their measuring system, wherein said membranes are to be subjected to a pressure, wherein - the first process connections each comprise two boreholes, -- which serve to accommodate fasteners, particularly bolts, via which the first process connection can be secured to a half of a process connection having the first process connection geometry, and -- which are arranged in such a way that the boreholes of the two side flanges (1, 49, 57) - when mounted in the measuring system - are arranged in a manner that forms a rectangle, characterized in that - the pressure channel connection areas of the first process connections are each arranged centrally between the two boreholes and opposite an imaginary line connecting the two boreholes in an offset manner in a direction that is parallel to the surface normal and oriented towards the interior side of the side wall of the relevant side flange (1, 49, 57). - each comprise a side wall which, when mounted, covers one of the two membranes of the measuring system and encloses a pressure chamber adjacent to the respective membrane, and - each comprise a first process connection arranged on a first of four front faces of the side wall, said front faces being located opposite one another in pairs, wherein said process connection comprises a pressure channel connection area into which a pressure channel enters, said pressure channel running through the side flange to the pressure chamber, - the first process connections are designed in such a way that a differential pressure sensor equipped with the flange set can be mounted and connected on a process connection via the first process connections, said process connection having a first process connection geometry designed for the connection and mounting of differential pressure sensors with two membranes located on the same exterior side of their measuring system, wherein said membranes are to be subjected to a pressure, - the first process connections each comprise two boreholes, -- which serve to accommodate fasteners, particularly bolts, via which the first process connection can be secured to a half of a process connection having the first process connection geometry, and -- which are arranged in such a way that the boreholes of the two side flanges (1, 49, 57) - when mounted in the measuring system - are arranged in a manner that forms a rectangle, -- which serve to accommodate fasteners, particularly bolts, via which the first process connection can be secured to a half of a process connection having the first process connection geometry, and -- which are arranged in such a way that the boreholes of the two side flanges (1, 49, 57) - when mounted in the measuring system - are arranged in a manner that forms a rectangle, - the pressure channel connection areas of the first process connections are each arranged centrally between the two boreholes and opposite an imaginary line connecting the two boreholes in an offset manner in a direction that is parallel to the surface normal and oriented towards the interior side of the side wall of the relevant side flange (1, 49, 57).