| 摘要 |
PROBLEM TO BE SOLVED: To provide a flowmeter capable of detecting a critical state. SOLUTION: A temperature sensor 21 is disposed on the upstream side of a part where a flow tube 6 for running a measuring fluid is choked in a Coriolis type mass flowmeter (in this case, a part choked by driving of a flow tube 6: a section a-b), and a temperature sensor 22 is installed on its downstream side. A temperature difference between the sensors 21 and 22 is calculated. When the temperature difference is above a predetermined value, it is detected that the measuring fluid reaches a critical state, and a user is informed of it. When the measuring fluid reaches the critical state, a supersonic region is formed in a part behind its choked position, so that the temperature is rapidly lowered. This flowmeter is composed by utilizing this phenomenon. COPYRIGHT: (C)2004,JPO
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