Improvements relating to flow measurement

摘要

A flowmeter (1) is disclosed which comprises a body having a portion in which the fluid flow oscillates as a function of flow through the body. The meter is provided with two ultrasonic transducers (10,11), a first one of the transducers transmitting ultrasound an second one receiving the ultrasound after it has been through the oscillating fluid. A processor is provided which compares the phase of the signal output from the second transducer (11) with a reference signal indicative of flow rate. Third and fourth transducers may also be provided to generate the reference signal. To be accompanied, when published, by Figure 1 of the drawings. <IMAGE>