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1. (WO1995032405) DENSITY COMPENSATED GAS FLOW METER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1995/032405 International Application No.: PCT/US1995/006633
Publication Date: 30.11.1995 International Filing Date: 25.05.1995
Chapter 2 Demand Filed: 20.12.1995
IPC:
G01F 1/36 (2006.01) ,G01F 1/44 (2006.01) ,G01F 1/50 (2006.01) ,G01F 1/88 (2006.01)
G PHYSICS
01
MEASURING; TESTING
F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05
by using mechanical effects
34
by measuring pressure or differential pressure
36
the pressure or differential pressure being created by the use of flow constriction
G PHYSICS
01
MEASURING; TESTING
F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05
by using mechanical effects
34
by measuring pressure or differential pressure
36
the pressure or differential pressure being created by the use of flow constriction
40
Details of construction of the flow constriction devices
44
Venturi tubes
G PHYSICS
01
MEASURING; TESTING
F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05
by using mechanical effects
34
by measuring pressure or differential pressure
50
Correcting or compensating means
G PHYSICS
01
MEASURING; TESTING
F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76
Devices for measuring mass flow of a fluid or a fluent solid material
86
Indirect mass flowmeters, e.g. measuring volume flow and density, temperature, or pressure
88
with differential-pressure measurement to determine the volume flow
Applicants:
MARCUM FUEL SYSTEMS, INC. [US/US]; 702 West 48th avenue #7 Denver, CO 80216, US
Inventors:
MILLER, Charles, E.; US
Agent:
YOUNG, James, R. ; Chrisman, Bynum & Johnson, P.C. 1900 Fifteenth Street Boulder, CO 80302, US
Priority Data:
08/248,68925.05.1994US
Title (EN) DENSITY COMPENSATED GAS FLOW METER
(FR) COMPTEUR A GAZ A COMPENSATION EN DENSITE
Abstract:
(EN) A mass flow meter for a gas dispenser (100) includes an apparatus and method for determining specific heat ratio of a gas as a function of two pressure measurements in relation to a sonic nozzle (52) and for determining mass flow rate as a function of the specific heat ratio, the two pressure measurements in relation to the nozzle (52), and a density measurement of the gas. A stagnant pressure is measured by transducer (96) just upstream of the sonic nozzle and dynamic pressure is measured at the nozzle (52) by a pressure transducer (310). The stagnant pressure, dynamic pressure and density are used to determine the specific heat ratio of the gas and then to determine the mass flow rate.
(FR) Compteur à gaz pour un distributeur (100) de gaz, faisant appel à un appareil et un procédé permettant de déterminer le rapport des chaleurs massiques d'un gaz en tant que fonction de deux mesures de pression se rapportant à une buse sonique (52) et de déterminer le débit masse en tant que fonction du rapport des chaleurs massiques, des deux mesures de pression se rapportant à la buse (52) et d'une mesure de densité du gaz. Une pression de stagnation est mesurée par le transducteur (96) juste en amont de la buse sonique et une pression dynamique est mesurée au niveau de la buse par le transducteur (310) de pression. La pression de stagnation, la pression dynamique et la densité sont utilisées pour déterminer le rapport des chaleurs massiques du gaz et ensuite pour déterminer le débit masse.
Designated States: AM, AT, AU, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, HU, JP, KE, KG, KP, KR, KZ, LK, LR, LT, LU, LV, MD, MG, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TT, UA, UG, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, MW, SD, SZ, UG)
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)