Title:
METHOD AND APPARATUS FOR MEASURING FLOW RATE, AND GAS METER
Document Type and Number:
Japanese Patent JP3783831
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring flow rate, and a gas meter capable of sensing a fluid, having different types of and composition from those of a prescribed fluid, without complicating the apparatus or increasing power consumption amount, when the fluid flows.
SOLUTION: Whether the type or the composition of a gas deviates from a prescribed type or composition can be decided by a deciding unit 400, based on data of propagation times T1, T2 measured by an ultrasonic wave propagation time measuring unit 100 of an existing general purpose unit for obtaining a measured flow rate value. Accordingly, whether the composition (mixture of air or the like) of the gas to be measured falls within an allowable rage can be decided, without having to complicated composition sensors, composition analyzers or the like. If it is decided that the gas to be measured contains a composition which deviates from the prescribed allowable range, an alarm unit 500 generates an alarm to this the effect, and the supply of the fluid can be shut off by a shut-off valve 600.
Inventors:
Kazumitsu Atui
Mamoru Suzuki
Kenichiro Yuasa
Mamoru Suzuki
Kenichiro Yuasa
Application Number:
JP2000089981A
Publication Date:
June 07, 2006
Filing Date:
March 28, 2000
Export Citation:
Assignee:
Tokyo Gas Co., Ltd.
International Classes:
G01F1/00; G01F3/22; G01F1/66; G01F15/06; G01F15/075; (IPC1-7): G01F1/66; G01F1/00; G01F3/22; G01F15/06; G01F15/075
Domestic Patent References:
| JP6507725A |
Attorney, Agent or Firm:
Yoichiro Fujishima
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