Flowmeter and flow control device

摘要

A simply structured flowmeter in which an influence of a compression wave on a thermal flow rate sensor (3) is suppressed, and measurement accuracy is enhanced. The flowmeter has not only the thermal flow rate sensor (3) that is placed to face a flow channel (1) and detects a flow rate of fluid flowing through the flow channel (1) but also a micro path (for example, narrow pipe (7)) that is provided to the flow channel (1) and blocks a compression wave created in the flow channel (1) from being transmitted to the thermal flow rate sensor (3).