CHECKING-INSPECTING METHOD OF LEAKAGE IN RECOVERED FLUIDIC MICROCOMPUTER GAS METER

Title:

CHECKING-INSPECTING METHOD OF LEAKAGE IN RECOVERED FLUIDIC MICROCOMPUTER GAS METER

Document Type and Number:

Japanese Patent JP2708290

Kind Code:

B2

Abstract:

PURPOSE: To enable highly-precise inspection of leakage in a short time by comparing the total sum of flow rate signals within a prescribed leakage checking-inspecting time with a threshold value after the inspecting time, immediately after a scan is started after a shut-off valve once operates.
CONSTITUTION: When a reset button is pushed, a timer circuit 2 starts to operate and a flow rate signal outputted from a flow sensor 1 is inputted to an integrator 4 and integrated therein. An integral value for 30 seconds, for instance, is inputted to a comparator circuit 6 via a gate circuit 5 and compared with a threshold value set by a threshold value setting circuit 7. When the integral value is larger than the threshold value, a signal of closure is outputted to a shut-off valve 10 and the valve 10 is closed. When the integral value smaller than the threshold value is inputted, the valve 10 is held open. When a gas cock is opened mis-takenly in an inspecting time of 30 seconds, a sudden change of a flow rate occurs and also the integral value becomes large. The integral value in this case is compared in a comparator circuit 8 with a threshold value of a high-flow-rate threshold value setting circuit 9. After judgement is made as abnormal, the signal of closure is outputted to the valve 10 and the valve 10 is stopped at once.

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Inventors:

Katsuhito Sakai
Ken Abe

Application Number:

JP18080891A

Publication Date:

February 04, 1998

Filing Date:

July 22, 1991

Export Citation:

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Assignee:

Tokyo Gas Co., Ltd.

International Classes:

G01F1/00; G01F1/20; G01F3/22; G01F15/075; (IPC1-7): G01F1/20; G01F1/00; G01F3/22

Domestic Patent References:

JP35055U
JP2129828U

Attorney, Agent or Firm:

Hiroshi Ohashi

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