ULTRASONIC FLOWMETER

摘要

An ultrasonic flowmeter comprises a measurement channel (6) through which fluid to be measured flows; ultrasonic transmitter/receiver units (8, 9) provided upstream and downstream of the measurement channel (6); openings (11, 12) through which the ultrasonic transmitter/receiver units (8, 9) face the measurement channel (6); a first control member (15) provided near the downstream opening (12) for limiting the fluid flowing into the opening (12); a second control member (16) provided in the measurements channel (6) upstream from the openings (11, 12) for limiting the fluid flowing into the openings (11, 12); a measurement control (19) for measuring the time of ultrasonic propagation between ultrasonic transmitter/receiver units (8, 9); and a processor (20) for calculating the flow rate based on the signal from the measurement control (19).