Abstract: A fluid flow sensor is provided that includes a flow sensor cartridge that is insertable within the fluid flow sensor and that provides greatly enhanced repeatability for the movement of the flow element without undesired engagement of the flow element with the flow body. The cartridge includes a saddle carrier and frame structure that forms a housing for the flow element to enable the flow element to be consistently positioned within the cartridge during manufacture. The flow element cartridge also includes non-uniform fulcrums to enable different but repeatable flexing properties for the flow element within the flow body and non-vertical hinge geometries that reduce stress on the flow element when bending, thereby increasing the useful life of the flow element and fluid flow sensor. The cartridge can also include an over-molded connection between the cartridge and the pressure measurement tubes to provide elastic strain relief on the tubes connected to the cartridge.