| 摘要 |
A method for operating a measuring apparatus (1) for determining the flow rate of a flowable medium through a measuring section (3) is provided, wherein the measuring apparatus (1) has, as sensors, two ultrasonic transceivers (4), which are arranged spaced apart from one another, for the purpose of ultrasonic testing of the measuring section (3) in and counter to the flow direction and for the purpose of picking up signals and is operated with an ultrasonic phase difference method. The flow rate is determined at east by the following method steps: the first of the sensors subjects the measuring section to ultrasonic testing in a flow direction and the signal is received by the second sensor, the signal is amplified and subjected to A/D conversion, a threshold value is formed, the associated phase angle H is determined and stored, the second of the sensors subjects the measuring section to ultrasonic testing against the flow direction and the signal is received by the first sensor, the signal is amplified and subjected to A/D conversion, a threshold value is formed, the associated phase angle R is determined and stored, the difference between the phase angles, which depends on the direction of flow, id formed, and the phase difference value is corrected using a factor that depends on diameter.
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