FLOW RATE MEASURING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a flow rate measuring apparatus which can measure the flow rate over a wide range from a micro flow rate to a large flow rate while ensuring a sufficient accuracy. SOLUTION: The reflective part 7a of a current velocity measuring section 7 is formed to have parabolic inner surfaces arranged symmetrically on a same axis while matching the focal point and the central coupling part 7b of the current velocity measuring section 7 is formed to have a tubular surface of small inside diameter. Ultrasonic oscillators are disposed on the upstream side and the downstream side of fluid flowing through the current velocity measuring section 7 in order to measure the flow rate of fluid from an intermediate flow rate to a large flow rate. Furthermore, a flowmeter 9 measuring micro flow rate is disposed at the coupling part 7b.