WO1998015811B1 - Densitometer - Google Patents
DensitometerInfo
- Publication number
- WO1998015811B1 WO1998015811B1 PCT/US1997/018062 US9718062W WO9815811B1 WO 1998015811 B1 WO1998015811 B1 WO 1998015811B1 US 9718062 W US9718062 W US 9718062W WO 9815811 B1 WO9815811 B1 WO 9815811B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plenum
- volume
- sample
- bore
- gas
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims 15
- 210000003800 Pharynx Anatomy 0.000 claims 4
- 230000000875 corresponding Effects 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 230000035939 shock Effects 0.000 abstract 1
Abstract
A densitometer (10) includes a gas sample plenum (40) that is connected to a gas supply pipe (26) via a flow-restricted inlet duct (42) to at least partially isolate and damp the sample plenum (40) from shocks and noises, turbulences, and abrupt pressure changes in the gas supply. A cantilevered vane (110) is positioned in the sample plenum (40) for gas density determinations on the principle that resonant frequency of the vane (110) is a function of the density of the gas in the sample plenum (40). The resonant frequency of the vane (110) in the gas is determined by applying a magnetic field generated by a driver assembly (120) against the vane (110) and detecting the resonant frequency with a vibration detector (117), which is connected to the driver assembly (120) in a phase locked loop.
Claims
AMENDED CLAIMS
[received by the International Bureau on 17 April 1998 (17.04.98); original claims 1-3 replaced by new claims 1-29 (5 pages)]
1 Densitometer apparatus for use in combination with a mass flow meter for measuring density of gas flowing from a gas supply through the mass flow meter, said densitometer apparatus comprising a staging plenum positioned between the gas supply and the mass flow meter, said staging plenum having a volume; a sample plenum positioned adjacent the staging plenum and having a volume that is at least 25 percent as large as the volume of the staging plenum; a gas inlet connecting the sample plenum in fluid flow relation with the gas supply and having a cross-sectional area sized such that a ratio of the sample plenum volume to the gas inlet cross-sectional area is not smaller than about 50:1; a gas outlet extending in fluid flow relation between the sample plenum and the staging plenum upstream from the gas inlet, said gas outlet having a cross-sectional area sized such that a ratio of the sample plenum volume to the gas outlet cross-sectional area is not smaller than about 50.1 ; and a vibration member positioned in the sample plenum, a vibration driver adjacent the vibration member, and a vibration detector adjacent the vibration member.
2. The densitometer apparatus of claim 1, including a gas supply manifold and wherein said staging plenum and said gas inlet are both connected in fluid flow relation to said manifold.
3. The densitometer apparatus of claim 1, wherein the ratio of the sample plenum volume to the gas inlet cross-sectional area is not larger than about 200: 1, and wherein the ratio of the sample plenum volume to the gas outlet cross-sectional area is not larger than about 200: 1.
4. The densitometer apparatus of claim 3, wherein the ratio of the sample plenum volume to the gas inlet cross-sectional area is about 125:1.
5. The densitometer apparatus of claim 3, wherein the ratio of the sample plenum volume to the gas outlet cross-sectional area is about 125:1.
6. The densitometer apparatus of claim 1, wherein the volume of the sample plenum is in a range of about 25 to 75 percent as large as the volume of the staging plenum.
7 The densitometer apparatus of claim 6, wherein the volume of the sample plenum is about 50 percent as large as the volume of the staging plenum.
8 The densitometer apparatus of claim 1, wherein the vibration member includes an elongated vane that is cantilever mounted in the sample plenum with a proximal end of said vane fixed and a distal end of said vane free to move.
9. The densitometer apparatus of claim 8, wherein the proximal end of the elongated vane is anchored to a cup-shaped base mounted at one end of the sample plenum in a manner such that the elongated vane extends into the sample plenum.
10. The densitometer apparatus of claim 9, wherein said cup-shaped base has a portion that is thinner than other portions of the cup-shaped base and said proximal end of said vane is anchored to said thinner portion.
1 1 The densitometer of claim 10, wherein said vibration detector includes a piezoelectric crystal adhered to said thinner portion.
12 The densitometer of claim 11 , wherein said elongated vane has a longitudinal axis and said piezoelectric crystal is adhered to said thinner portion offset to one side of the longitudinal axis.
13 Gas metering apparatus, comprising: a sonic nozzle with a converging section that converges to a throat that has a throat diameter and with a diverging section that diverges from the throat; a staging plenum in fluid flow communication with a gas supply, said staging plenum having a volume that is positioned between the converging section of the sonic nozzle and the gas supply, said staging plenum having a diameter that is at least four times as large as the throat diameter; a sample plenum positioned adjacent the staging plenum and having a volume that is at least 25 percent as large as the staging plenum volume; a gas inlet connecting the sample plenum in fluid flow relation with the gas supply and having a cross-sectional area that is sized such that a ratio of the sample plenum volume to the gas inlet cross-sectional area is not smaller than about 50:1; a gas outlet extending in fluid flow relation between the sample plenum and the staging plenum upstream from the gas inlet, said gas outlet having a cross-sectional area sized such that a ratio of the sample plenum volume to the gas outlet cross-sectional area is not smaller than about 50:1; and gas density measuring apparatus positioned in said sample plenum.
14. The gas metering apparatus of claim 13, including a gas supply manifold and wherein said staging plenum and said gas inlet are both connected in fluid flow relation to said manifold.
15. The gas metering apparatus of claim 13, wherein the ratio of the sample plenum volume to the gas inlet cross-sectional area is not larger than about 200: 1, and wherein the ratio of the sample plenum volume to the gas outlet cross-sectional area is not larger than about 200: 1.
16 The gas metering apparatus of claim 15, wherein the ratio of the sample plenum
14 volume to the gas inlet cross-sectional area is about 125 1
17 The gas metering apparatus of claim 15, wherem the ratio of the sample plenum volume to the gas outlet cross-sectional area is about 125 1
18 The gas metering apparatus of claim 13, wherem the volume of the sample plenum is in a range of about 25 to 75 percent as large as the volume of the staging plenum
19 The gas metering apparatus of claim 18, wherem the volume of the sample plenum is about 50 percent as large as the volume of the staging plenum
20 The gas metering apparatus of claim 13, wherem the gas density measuring apparatus includes an elongated vane that is cantilever mounted in the sample plenum with a proximal end of said vane fixed and a distal end of said vane free to move
21 The gas metering apparatus of claim 20, wherem the proximal end of the elongated vane is anchored to a cup-shaped base mounted at one end of the sample plenum in a manner such that the elongated vane extends into the sample plenum
22 The gas meteπng apparatus of claim 21, wherem said cup-shaped base has a portion that is thinner than other portions of the cup-shaped base and said proximal end of said vane is anchored to said thinner portion
23 The gas meteπng of claim 22, wherem said vibration detector includes a piezoelectric crystal adhered to said thinner portion
24 The gas meteπng of claim 23, wherem said elongated vane has a longitudinal axis and said piezoelectπc crystal is adhered to said thinner portion offset to one side of the longitudinal axis
25 Densitometer apparatus for use in combination with mass flow meters for measuring density of gas flowmg from a gas supply through the mass flow meters, said densitometer apparatus compπsmg a manifold connected m fluid flow relation to the gas supply, a first staging plenum positioned in fluid flow relation between the manifold and a first mass flow meter, said first staging plenum having a volume, a second staging plenum positioned in fluid flow relation between the manifold and a second mass flow meter, said second staging plenum havmg a volume, a sample plenum positioned between the first staging plenum and the second staging plenum and having a volume, a gas mlet extending m fluid flow relation between the manifold and the gas inlet, said gas inlet havmg a cross-sectional area sized such that a ratio of the sample plenum volume to the gas mlet cross-sectional area is not smaller than about 50 1, a first gas outlet extendmg in fluid flow relation between the sample plenum and the
15 first staging plenum, said first gas outlet having a cross-sectional area sized such that a ratio of the sample plenum volume to the first gas outlet cross-sectional area is not smaller than about 50: 1; a second gas outlet extending in fluid flow relation between the sample plenum and the second staging plenum, said second gas outlet having a cross-sectional area sized such that a ratio of the sample plenum volume to the second gas outlet cross-sectional area is not smaller than about 50: 1 ; and a vibration member positioned in the sample plenum, a vibration driver adjacent the vibration member, and a vibration detector adjacent the vibration member.
26. Densitometer apparatus, comprising:
(A) a body having:
(i) a manifold bore extending from a first face on the body into said body along a manifold axis; (ii) a first staging plenum bore extending from a second face on the body into the body along a first staging plenum axis that intersects said manifold axis, said first staging plenum bore extending into the body for a sufficient distance to intersect said manifold bore;
(iii) a second staging plenum bore extending from said second face into the body along a second staging plenum axis that intersects said manifold axis, said second staging plenum bore extending into the body for a sufficient distance to intersect said manifold bore;
(iv) a sample plenum bore extending from said second face into the body along a sample plenum axis positioned between the first staging plenum and the second staging plenum, said sample plenum bore not intersecting said manifold bore;
(v) a gas inlet bore that is smaller in diameter than said sample plenum bore extending from said sample plenum bore to said manifold bore;
(vi) a first gas outlet bore extending between said sample plenum bore and said first staging plenum bore, said first gas outlet bore being smaller in diameter than said sample plenum bore and smaller in diameter than said first staging plenum bore;
(vii) a second gas outlet bore extending between said sample plenum bore and said second staging plenum bore, said second gas outlet bore being smaller in diameter than said sample plenum bore and smaller in diameter than said second staging plenum bore;
16 (B) a first mass flow meter mounted on said second face of the body in fluid flow relation to said first staging plenum bore; (C) a second mass flow meter mounted on said second face of the body in fluid flow relation to said second staging plenum bore, and
(D) density measuring apparatus mounted on said second face of the body and extending into said sample plenum bore.
27 The densitometer apparatus of claim 26, wherein said sample plenum bore has a volume and said gas inlet bore has a cross-sectional area sized such that a ratio of the sample plenum bore volume to the gas inlet cross-sectional area is not smaller than about 50:1.
28. The densitometer apparatus of claim 27, wherein said first staging plenum bore has a volume and said second staging plenum has a volume, further wherein said sample plenum bore volume is at least 25 percent as large as the first staging plenum bore volume and at least 25 percent as large as the second staging plenum bore volume.
29. The densitometer apparatus of claim 28, wherein the first gas outlet bore is sized to have a cross-sectional area such that a ratio of the sample plenum bore volume to the first gas outlet bore cross-sectional area is not smaller than about 50:1, and wherein the second gas outlet bore is sized to have a cross-sectional area such that a ratio of the sample plenum bore volume to the second gas outlet bore cross-sectional area is not smaller than about 50:1.
17 STATEMENT UNDER ARTICLE 19
Claims 1 through 29 represented in the replacement pages 12-16 accompanying the applicant's Amendment After Notification of Transmittal of the International Search Report Under Article 19(1), Rule 46, as described in the accompanying Letter Describing Differences Between Replaced Sheets and Replacement Sheets submitted concurrently herewith, are made to amend the claims to be substantially the same as the claims in the corresponding U.S. patent application. This amendment defines the invention more clearly over the prior art found in the international search and over prior art references that were cited in the corresponding U S patent application This amendment has no impact on the description and drawings
18
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU48099/97A AU725475B2 (en) | 1996-10-07 | 1997-10-07 | Densitometer |
| NZ335089A NZ335089A (en) | 1996-10-07 | 1997-10-07 | Densitometer with separate measuring plenum chamber |
| EP97910821A EP0929801A4 (en) | 1996-10-07 | 1997-10-07 | Densitometer |
| CA002267886A CA2267886A1 (en) | 1996-10-07 | 1997-10-07 | Densitometer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/726,942 US5900534A (en) | 1996-10-07 | 1996-10-07 | Densitometer |
| US08/726,942 | 1996-10-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998015811A1 WO1998015811A1 (en) | 1998-04-16 |
| WO1998015811B1 true WO1998015811B1 (en) | 1998-06-04 |
Family
ID=24920678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/018062 WO1998015811A1 (en) | 1996-10-07 | 1997-10-07 | Densitometer |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5900534A (en) |
| EP (1) | EP0929801A4 (en) |
| CN (1) | CN1240024A (en) |
| AU (1) | AU725475B2 (en) |
| CA (1) | CA2267886A1 (en) |
| NZ (1) | NZ335089A (en) |
| WO (1) | WO1998015811A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6412354B1 (en) | 1999-12-16 | 2002-07-02 | Halliburton Energy Services, Inc. | Vibrational forced mode fluid property monitor and method |
| EP1723467A2 (en) * | 2004-02-03 | 2006-11-22 | Rochester Institute of Technology | Method of photolithography using a fluid and a system thereof |
| US7412986B2 (en) * | 2004-07-09 | 2008-08-19 | Celerity, Inc. | Method and system for flow measurement and validation of a mass flow controller |
| US7150201B2 (en) * | 2004-12-15 | 2006-12-19 | Celerity, Inc. | System and method for measuring flow |
| EP2458348B1 (en) * | 2010-11-29 | 2013-08-14 | Air Products And Chemicals, Inc. | Method of, and apparatus for, measuring the mass flow rate of a gas |
| ES2749877T3 (en) | 2010-11-29 | 2020-03-24 | Air Prod & Chem | Method and apparatus for measuring the molecular weight of a gas |
| PL2667160T3 (en) | 2012-05-24 | 2021-05-04 | Air Products And Chemicals, Inc. | Method of, and Apparatus for, Regulating the Mass Flow Rate of a Gas |
| ES2536091T3 (en) * | 2012-05-24 | 2015-05-20 | Air Products And Chemicals, Inc. | Apparatus for measuring the true content of a gas cylinder under pressure |
| EP2667159B1 (en) | 2012-05-24 | 2021-12-01 | Air Products And Chemicals, Inc. | Method of, and Apparatus for, Measuring the Mass Flow Rate of a Gas |
| PL2667277T3 (en) | 2012-05-24 | 2018-05-30 | Air Products And Chemicals, Inc. | Method of, and apparatus for, providing a gas mixture |
| EP2667276B1 (en) | 2012-05-24 | 2017-11-08 | Air Products And Chemicals, Inc. | Method of, and apparatus for, providing a gas mixture |
| ES2556783T3 (en) | 2012-05-24 | 2016-01-20 | Air Products And Chemicals, Inc. | Method and apparatus for measuring the physical properties of biphasic fluids |
| US10184870B2 (en) * | 2013-04-03 | 2019-01-22 | Micro Motion, Inc. | Vibratory sensor and method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2754676A (en) * | 1954-03-17 | 1956-07-17 | Carl Casey | Densimeter |
| DE1598084C3 (en) * | 1965-12-21 | 1974-02-21 | Basf Ag, 6700 Ludwigshafen | Device for the continuous determination of the specific gravity of flowable substances |
| GB1175664A (en) * | 1966-01-28 | 1969-12-23 | Solartron Electronic Group | Improvements in or relating to Methods of Measuring the Densities of Fluids and Apparatus therefor |
| GB1277403A (en) * | 1968-08-30 | 1972-06-14 | Solartron Electronic Group | Improvements in or relating to transducers suitable for use in measuring the density of or the pressure or a pressure difference in fluids |
| GB1385686A (en) * | 1971-05-05 | 1975-02-26 | Solartron Electronic Group | Transducers |
| US3956922A (en) * | 1974-12-09 | 1976-05-18 | International Telephone And Telegraph Corporation | Densitometer probe shield and well |
| GB2027539B (en) * | 1978-08-09 | 1983-09-21 | Marconi Co Ltd | Measurement of the density of liquids |
| US4453401A (en) * | 1982-03-12 | 1984-06-12 | The United States Of America As Represented By The Secretary Of The Air Force | Pressure sensor and soil stress isolation filter arrangement in a pore pressure probe |
| US4546641A (en) * | 1983-10-17 | 1985-10-15 | International Telephone & Telegraph Corp. | Densitometer |
| US5533381A (en) * | 1994-06-10 | 1996-07-09 | Seale; Joseph B. | Conversion of liquid volume, density, and viscosity to frequency signals |
-
1996
- 1996-10-07 US US08/726,942 patent/US5900534A/en not_active Expired - Fee Related
-
1997
- 1997-10-07 AU AU48099/97A patent/AU725475B2/en not_active Ceased
- 1997-10-07 EP EP97910821A patent/EP0929801A4/en not_active Withdrawn
- 1997-10-07 NZ NZ335089A patent/NZ335089A/en unknown
- 1997-10-07 WO PCT/US1997/018062 patent/WO1998015811A1/en not_active Application Discontinuation
- 1997-10-07 CN CN97180385.4A patent/CN1240024A/en active Pending
- 1997-10-07 CA CA002267886A patent/CA2267886A1/en not_active Abandoned
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