| 摘要 |
A measuring arrangement for determining flow speeds in a flow channel includes a probe tube which is introduced via a first opening into the flow channel. The probe tube is exposed to a flow with a flow speed, the side of the probe tube facing the flow comprising a plurality of openings which are interconnected inside the probe tube such that a total pressure dependent on the flow speed prevails inside the probe tube. The measuring arrangement also comprises a static pressure opening in the flow channel, and a differential pressure sensor that determines the differential pressure between the total pressure inside the probe and the static pressure in the flow channel. The probe tube may be partially surrounded by a shield which is mobile and/or length-adjustable and that, according to its position and/or length along the probe tube, may close one, several or none of the openings.
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