Title:
GAS METER
Document Type and Number:
Japanese Patent JP3401742
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To measure a flow rate correctly corresponding to a flammable gas by using an operation rule corresponding to the air until a gas flow measurement function is inspected and using an operation rule corresponding to a gas flow when the gas flow of a different kind is measured.
SOLUTION: A heat flow rate-detecting means 101 outputs an electric signal corresponding to a change of a thermal state based on a gas flow, a gas flow rate-operating means 102 operates a gas flow rate corresponding to the signal, and a gas flow rate-integrating means 103 integrates the gas flow rates. An operation rule-holding means 201 of the gas flow rate-operating means 102 holds a plurality of operation rules corresponding to a plurality of gas kinds including the air. The operation rule corresponding to the air as the gas kind is used until a gas flow measurement function is inspected before the gas meter is shipped from a factory. When a flow of a gas different from the air is to be measured, the operation rule corresponding to the gas kind is used. An operation rule-switching means switches the rules. For instance, LPG gas or the like flammable gas can be calculated by the operation rule correctly corresponding thereto in actual use.
Inventors:
Yamaura, Michiaki
Application Number:
JP1997000287243
Publication Date:
February 28, 2003
Filing Date:
October 20, 1997
Export Citation:
Assignee:
YAZAKI CORP
International Classes:
G01F1/68; G01F1/00; G01F1/696; G01F3/22; G01F25/00; G01F1/68; G01F1/00; G01F1/696; G01F3/02; G01F25/00; (IPC1-7): G01F3/22; G01F1/00; G01F1/68; G01F25/00
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