ULTRASONIC FLOW MEASURING METHOD

PROBLEM TO BE SOLVED: To provide an ultrasonic flow measuring method guaranteeing the required high precision. SOLUTION: In this ultrasonic flow measuring method for a fluid medium, a measuring tube and at least two pairs of ultrasonic converters arranged on the measuring tube and each forming a measuring path respectively are used, the flow of the fluid medium is detected from the speeds of the medium along at least two measuring paths, and the value for the flow is corrected based on the value for a Reynolds number. The Reynolds number of the fluid medium is detected entirely based on the ratio or difference of the speeds along the different measuring paths without exception, and the value for the flow is corrected with the consistent prescribed value for the Reynolds number.