Throughflow measuring device having a housing and measuring insert

A throughflow measuring device for a liquid or gaseous medium, having a housing and a measuring insert which can be inserted in the housing and which has a measuring path, wherein

• a) the measuring insert has a throughflow direction in which the medium to be detected flows through the measuring path during operation,
• b1) the housing has an inner housing wall,
• b2) the inner housing wall is provided with a housing assembly groove which extends perpendicularly to the throughflow direction,
• c) the measuring insert has a measuring insert outer wall and the measuring insert outer wall is provided with a measuring insert assembly groove which extends perpendicularly to the throughflow direction, and
• d) the housing and the measuring insert in an assembled state are orientated relative to each other at least in the throughflow direction and are fixed in a position orientated relative to each other by means of a securing element, wherein, in order to fix the housing and the measuring insert in the position orientated relative to each other, at least a first partial region of the securing element engages in the housing assembly groove and at least a second partial region of the securing element engages in the measuring insert assembly groove.