Title:
GAS METER CALIBRATOR
Document Type and Number:
Japanese Patent JP3184885
Kind Code:
B
Abstract:
PURPOSE: To achieve tests of a flow rate, a differential pressure and a leakage for a gas meter using an acoustic velocity nozzle precisely without being affected by pressure, temperature and moisture in a room changing during the testing.
CONSTITUTION: A pressurization reference pressure line 1 for testing leakage and an atmospheric air line for testing flow rates are connected to a gas meter line 9 with a gas meter connected thereto in series being allowed to switch. Moreover, a SV meter chamber 11 is connected to a vacuum pump and a testing of a flow rate is performed by comparing the gas meter 10 with an acoustic velocity nozzle 12. In the test of leakage, after the introduction of an atmospheric air pressure through a solenoid valve V5, the air pressure is measured with a differential pressure detector 23 using the pressure of the atmospheric air reference pressure line 20 as measured with an absolute manometer 26 sealed as reference. In the test of a differential pressure, the pressure between outflow ports 10a and 10b as measured with the pressure of the atmospheric air reference pressure line 20 as reference is read out as a difference between the differential pressure detectors 23 and 24.
Inventors:
Takamoto, Masaki
Ishibashi, Masahiro
Ootsuki, Sakujirou
Ishibashi, Masahiro
Ootsuki, Sakujirou
Application Number:
JP1992000268128
Publication Date:
May 11, 2001
Filing Date:
September 10, 1992
Export Citation:
Assignee:
AGENCY OF IND SCIENCE & TECHNOL
OVAL CORP
OVAL CORP
International Classes:
G01F25/00; G01F25/00; (IPC1-7): G01F25/00
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