Protective grating for a mass flow rate sensor in a channel of suctioned air

A device for determining at least one parameter of a flowing medium in the form of a gas/liquid/solid-matter particle mixture flowing in a line having regions of flow, comprising:

• a measuring element arranged in the line and circumflowed by the flowing medium;
• and
• at least one protective grating arranged at least partially upstream of the measuring element within the line, the at least one protective grating including:
• at least one channel that at least partially diverts the flowing medium, flowing in a flow direction, downstream after the at least one protective grating, and
• at least one side wall of the at least one channel including at least two sections forming with the flow direction a first angle of intersection and a second angle of intersection that differs from the first angle of intersection so that at least some components of the flowing medium are manipulated to flow in a region of flow that does not impact the measuring element.