Measuring device for detecting the flow velocity of liquids and gases

摘要

A measuring device is proposed which serves to detect the flow velocity of liquids and gases in a line. The measuring device comprises a transducing sensor (12) and two signal scanners (13, 14) which are arranged downstream of the transducing sensor in the flow direction (11) and are formed from a plurality of mutually parallel scan paths (13a, 14a) arranged behind one another in the flow direction, the arrangement being that in each case a scan path (13a) of one signal scanner (13) is alternately followed at the same spacing by a scan path (14a) of the other signal scanner (14). The two signal scanners (13, 14) have a common electrical terminal (15) for their input and two mutually separated output terminals (17, 18) which are connected to an evaluation circuit (23, 24). The measuring device (10) is intended to provide measured values of the flow velocity of the medium which are as accurate as possible over a large range of measurements irrespective of interference. For this purpose, the signals picked up by the signal scanners (13, 14) are merged in the evaluation circuit (22). The frequency of the measurement signal thus formed is proportional in this case to the flow velocity of the medium. <IMAGE>