Breathing apparatus comprising a differential pressure sensor

A ventilator apparatus, comprising:

• at least one differential pressure measurement path;
• and a differential pressure sensor, wherein the differential pressure measurement path has a flow channel with at least two measurement openings that are arranged between an inflow opening and an outflow opening of the flow channel and are joined by measurement lines arranged in measurement nozzles, wherein a respiratory gas is guided from the inflow opening to the outflow opening through the flow channel in a principal flow direction, wherein a volumetric flow rate/differential pressure characteristic curve is realized by the differential pressure measurement path in conjunction with the differential pressure sensor, said characteristic curve lying between a linear curve a·X1.0+b and a curve describable by a·X1.5+b, wherein b is approximately equal to 0, wherein, in the principal flow direction of the respiratory gas through the flow channel, the flow channel is at least partly ring-shaped or is a ring segment, wherein the measurement nozzles are flanged onto the flow channel so that an alignment of the measurement lines, at least in a region of the measurement openings, has a component that is tangential to an outer delimiting face of the flow channel and/or to the principal flow direction of the respiratory gas in the flow channel, and wherein the alignment of one of the measurement lines, at least in the region of the measurement openings, lies in an angular range of 0° to 60° about an axis defined by a local tangent in a direction of an axis that is orthogonal to the local tangent and extends in a radial direction, wherein the flow channel is arranged in an adapter that connects the ventilator apparatus with a respiration tube, and wherein the flow channel is limited in a radial inward direction and a radial outward direction by a material of the adapter.