US4885938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowmeter fluid composition correction
Assignee: Honeywell Inc
•
Filing: 1988-12-16
•
Granted: 1989-12-12
•
Expires: 2008-12-16
Abstract
Abstract Certain relationships among the mass flow signal the thermal conductivity, specific heat and density of the fluid measured can be used to correct a mass flowmeter measurement with respect to changes in composition of the fluid.
Inventors
- 👤 Robert E. Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:28
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/02; G01F15/04; G01F15/043; G01F1/00; G01F1/68; G01F1/684; G01F1/6842
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A method for compensating the mass flow measurement of a fluid flowmeter of the thermal microanemometer class for changes in the composition of the fluid of interest the flow of which is sought to be determined or monitored comprising the steps of: obtaining an on-going uncorrected nulled mass flow value (M o )for the fluid of interest in relation to the microanemometer sensor output; obtaining the specific heat (c p ) thermal conductivity (k) and density (q) obtaining the corrected mass flow (M) from the nulled mass flow according to the relationship ##EQU2##
Claim 2
Independent Claim
93 words
A method for compensating the mass flow measurement of a fluid flowmeter of the thermal microanemometer class for changes in the composition of the fluid of interest the flow of which is sought to be determined or monitored comprising the steps of: obtaining an on-going uncorrected nulled mass flow value (M o )for the fluid of interest in relation to the microanemometer sensor output; obtaining the specific heat (c p ) thermal conductivity (k) and density (q) obtaining the corrected mass flow (M) from the nulled mass flow according to the relationship ##EQU2##
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein said c p , k and q values are derived from a static anemometer measurement of the fluid of interest.
Claim 4
Independent Claim
88 words
A method for compensating compositional changes with respect to the actual dynamic sensor flow output signal from a microanemometer flow sensor in a mass flowmeter of the thermal microanemometer class conducting a fluid of interest comprising the steps of: obtaining the nulled microanemometer sensor output signal in relation to the mass flow of the fluid of interest; obtaining the specific heat (c p ) thermal conductivity (k) and density (q); obtaining the corrected sensor output (s) from the nulled sensor output according to the relationship S=S.sub.o {k(3.8+q)/c.sub.p)}.sup.0.4 (II)
Claim 5
Independent Claim
88 words
A method for compensating compositional changes with respect to the actual dynamic sensor flow output signal from a microanemometer flow sensor in a mass flowmeter of the thermal microanemometer class conducting a fluid of interest comprising the steps of: obtaining the nulled microanemometer sensor output signal in relation to the mass flow of the fluid of interest; obtaining the specific heat (c p ) thermal conductivity (k) and density (q); obtaining the corrected sensor output (s) from the nulled sensor output according to the relationship S=S.sub.o {k(3.8+q)/c.sub.p)}.sup.0.4 (II)
Claim 6
Dependent Claim
26 words
The method of claim 3 wherein said c p , k and q values are derived from a static anemometer measurement of the fluid of interest.
References Cited (Backward Citations)
US1769358A
Cited
US4478076A
Cited
US4478077A
Cited
US4501144A
Cited
US4651564A
Cited
US4683159A
Cited
US4555939A
Cited
US4685331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |