EP0154531A1
Expired / Lapsed
EP
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Electronic square root error indicator
Assignee: Southern Gas Association
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Filing: 1985-03-01
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Granted: —
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Expires: 2005-03-01
Abstract
Abstract An apparatus for determining a square root averaging error for a dirferential pressure orifice meter while measuring volumetric fluid flow in a closed medium including input circuitry (12, 14) that provides an input signal corresponding to the instantaneous differential pressure measured at the orifice plate and logic circuitry (21) connected to receive the signals from the input circuitry for computing the square root averaging error for the orifice meter over a selected time interval. Also disclosed in an apparatus for measuring volumetric fluid flow in a closed medium that includes input circuitry (12, 14) for providing an input signal corresponding to a differential pressure at an orifice located within the closed medium and logic circuitry (21) connected to receive the input signal, compute a square root of the corresponding differential pressure and provide an output signal corresponding to this square root.
Inventors
- 👤 Carl E. Edlund
- 👤 Cecil R. Sparks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/50
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
63 words
An apparatus for determining a differential pressure orifice meter square root averaging error in measuring volumetric fluid flow in a closed medium comprising; circuit means for providing a signal corresponding to an instantaneous differential pressure measured by the orifice meter; and logic means for receiving said signal and computing the square root averaging error for the orifice meter for a selected time interval.
Claim 2
Independent Claim
63 words
An apparatus for determining a differential pressure orifice meter square root averaging error in measuring volumetric fluid flow in a closed medium comprising; circuit means for providing a signal corresponding to an instantaneous differential pressure measured by the orifice meter; and logic means for receiving said signal and computing the square root averaging error for the orifice meter for a selected time interval.
Claim 3
Dependent Claim
94 words
An apparatus according to Claim 1 wherein said logic means includes the means for computing a square root of the instantaneous differential pressure, a square root of an average of instantaneous differential pressure measurements over the selected time interval and the quantity of a difference of the average square root of the instantaneous pressure measurements. over the selected time intervals subtracted from the square root of the average differential pressure measurement over the time interval divided by the average of the square root of instantaneous differential pressure measurements to compute the square root error.
Claim 4
Dependent Claim
25 words
An apparatus according to Claim 2 wherein said circuit means further includes an analog to digital converter connected to the output of the orifice meter.
Claim 5
Dependent Claim
23 words
An apparatus according to Claim 3 wherein said apparatus includes display means connected to said logic means for displaying the square root error.
Claim 6
Dependent Claim
30 words
An apparatus according to Claim 4 wherein said apparatus further includes input means connected to said logic means for providing external control of the computation of the square root error.
Claim 7
Dependent Claim
21 words
An apparatus according to Claim 5 wherein said time interval is longer than any pulsation frequency time interval of fluid flow.
Claim 8
Dependent Claim
24 words
An apparatus according to Claim 6 wherein said circuit means provides said signal at a frequency greater than twice any fluid flow pulsation frequency.
Claim 9
Dependent Claim
20 words
An apparatus according to Claim 7 wherein said circuit means is responsive to said logic means for providing said signal.
Claim 10
Dependent Claim
16 words
An apparatus according to Claim 8 wherein said time interval is specified from said input means.
Claim 11
Dependent Claim
22 words
An apparatus according to Claim 9 wherein said apparatus further includes a self-contained power means for supplying electrical power to said apparatus.
Claim 12
Independent Claim
62 words
An apparatus for measuring volumetric fluid flow in a closed medium comprising: circuit means for providing an input signal corresponding to a differential pressure at an orifice located within said closed medium; and logic means for receiving said input signal, computing a square root of the differential pressure in response thereto, and providing a first output signal corresponding to said square root.
Claim 13
Independent Claim
62 words
An apparatus for measuring volumetric fluid flow in a closed medium comprising: circuit means for providing an input signal corresponding to a differential pressure at an orifice located within said closed medium; and logic means for receiving said input signal, computing a square root of the differential pressure in response thereto, and providing a first output signal corresponding to said square root.
Claim 14
Dependent Claim
31 words
An apparatus according to Claim 11 wherein said apparatus further includes display means connected to said logic means for receiving said first output signal and providing a first visible output indicia.
Claim 15
Dependent Claim
25 words
An apparatus according to Claim 12 wherein said logic means includes at least one accumulator to accumulate the square roots over an interval of time.
Claim 16
Dependent Claim
31 words
An apparatus according to Claim 13 wherein said logic means further includes means to provide a second output signal corresponding to an average of the square roots over said time interval.
Claim 17
Dependent Claim
33 words
An apparatus according to Claim 14 wherein said displav means is connected to said logic means for receiving said second output signal and providing a second visible output indicia of said second output.
Claim 18
Dependent Claim
25 words
An apparatus according to Claim 15 wherein said circuit means includes an analog to digital converter for providing a digital value for said input signal.
Claim 19
Dependent Claim
26 words
An apparatus according to Claim 16 wherein said display means includes a digital to analog converter for providing said first output signal in an analog form.
Claim 20
Independent Claim
85 words
An apparatus for measuring volumetric fluid flow in a closed medium comprising: circuit means for providing an input signal corresponding to a differential pressure at an orifice located upon said closed medium; and logic means for receiving said input signal, computing a square root of said differential pressure in response thereto, accumulating said square root values for a specific time interval, computing an average of said square roots of the differential pressure measurements, and providing an output signal corresponding to said average square root value.
Claim 21
Independent Claim
85 words
An apparatus for measuring volumetric fluid flow in a closed medium comprising: circuit means for providing an input signal corresponding to a differential pressure at an orifice located upon said closed medium; and logic means for receiving said input signal, computing a square root of said differential pressure in response thereto, accumulating said square root values for a specific time interval, computing an average of said square roots of the differential pressure measurements, and providing an output signal corresponding to said average square root value.
Claim 22
Dependent Claim
21 words
An apparatus according to Claim 18 wherein said apparatus further includes input means for providing external user control of the apparatus.
Claim 23
Dependent Claim
20 words
An apparatus according to Claim 19 wherein said apparatus further includes display means to display the average square root value.
References Cited (Backward Citations)
DE2547043A1
Cited
US4337668A
Cited
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