Flow measuring device for detecting a volume variable which relates to a fluid volume that has flowed through a measuring volume since the beginning of the measurement

摘要

Flow measuring device for detecting a volume variable (13) which relates to a volume of fluid that has flowed through a measuring volume (2) of the flow device (1) since the start of measurement, a processing device (5) of the flow measuring device (1) being set up to measure at successive measuring times (16, 20 , 21, 22, 23, 29) each based on measurement data from at least one sensor (3, 4) of the flow measuring device (1) to determine a current flow measurement variable (6) relating to the current volume flow and, when the processing device (5) is in operation, in a first Operating mode (18) to increase the volume variable (13) as a function of the current measured flow variable (6) and to keep the volume variable (13) constant when the processing device (5) is operated in a second operating mode (17), characterized in that the processing device (5) comprises a data memory (7), the processing device (5) being set up to at least st in the second operating mode (17), preferably both in the first and in the second operating mode (17, 18), for each measurement time (16, 20, 21, 22, 23, 29) the respective current flow measurement variable (6) at least temporarily in the To store data memory (7), whereby in the data memory (7) after several measurement times (16, 20, 21, 22, 23, 29) several at these measurement times (16, 20, 21, 22, 23, 29) determined, previous Flow measurement variables (26) are stored, the processing device (5) being set up in such a way that, if a switchover condition (9) is fulfilled during operation in the second operating mode (17), the fulfillment of which depends on the current flow measurement variable (6), in switches the first operating mode (18), the volume size (13) being increased as a function of both the current measured flow rate (6) and a predetermined number of the previous measured flow rate (26).