发明名称 |
FLOW RATE MEASURING METHOD AND FLOWMETER, FLOW RATE MEASURING SECTION PACKAGE USED FOR THEM AND FLOW RATE MEASURING UNIT USING THEM, AND PIPING LEAKAGE INSPECTION DEVICE USING FLOWMETER |
摘要 |
Measurements are obtained by a computing unit based on an output Vh from an indirectly-heated constant-temperature controlling flow rate measuring section (16) and an output Vout from a two-constant-point temperature difference detecting flow rate measuring sections (18a, 18b). In the flow rate measuring section (16), a heating element (163) is feedback-controlled based on a detected temperature by a heat sensing element (162) to obtain an output Vh based on the feedback-controlled condition. An output Vout is obtained from flow rate measuring sections (18a, 18b) based on the detected temperature difference between a heat sensing element (182) disposed on the liquid-flow-direction upstream side of the flow rate measuring section (16) and a temperature sensing element disposed on the downstream side. A computing unit outputs as a measurement a flow rate obtained based on the output Vh in a flow rate region where a flow rate is larger than a predetermined boundary flow rate, and outputs as a measurement a flow rate obtained based on the output Vout in a flow rate region where it is less than a boundary flow rate. Accordingly, a flow rate is measured with good precision and sensitivity over a wide flow rate range from a trace-amount flow rate region to a comparatively large flow rate region.
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申请公布号 |
WO03078934(A1) |
申请公布日期 |
2003.09.25 |
申请号 |
WO2003JP03251 |
申请日期 |
2003.03.18 |
申请人 |
MITSUI MINING & SMELTING CO., LTD.;KOIKE, ATSUSHI;KAWANISHI, TOSHIAKI;NAKAMURA, TOSHIMI;TAKAHATA, TAKAYUKI;YAMAGISHI, KIYOSHI |
发明人 |
KOIKE, ATSUSHI;KAWANISHI, TOSHIAKI;NAKAMURA, TOSHIMI;TAKAHATA, TAKAYUKI;YAMAGISHI, KIYOSHI |
分类号 |
G01F1/68;G01F1/684;G01F1/699;G01F7/00;G01M3/28;(IPC1-7):G01F1/68 |
主分类号 |
G01F1/68 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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