Flow measuring device for operating a gas analyzer

Flow measuring device for operating a gas analyzer having an analyzer, the apparatus comprising a suction system, characterized in that the measuring gas can be sucked through the analyzer, and a capillary K3, wherein on both sides a differential pressure sensor D connected to the capillary and to the same through the capillary K1 and K2 gas inlets are connected, via the capillaries K1 and K2 air can be sucked.