Method and devices use in flow measurement
First Claim
1. A method used in the measurement of a fluid flow comprising the steps of:
- generating a measurement signal representing an instantaneous fluid flow using a flow transducer in a flowmeter;
determining amplitude variations of the measurement signal for at least one predetermined period of time; and
comparing said determined amplitude variations with reference amplitude variations based on predetermined flow conditions to decide whether the flowmeter measures said fluid flow correctly, wherein said determined amplitude variations and said reference amplitude variations are noise.
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Accused Products
Abstract
In flow measurement, a measurement signal essentially representing the instantaneous flow rate is determined with the aid of a flow transducer (2) in a flowmeter (1). In order to check whether the flowmeter measures correctly or not, the noise in the measurement signal from the transducer (2) is analyzed. To be more specific, one or more distribution values for the measurement signal are determined and compared with predetermined reference values that have been determined for operating conditions for which the flow transducer is intended. If this comparison reveals that the existing operating conditions differ from those for which the flowmeter is intended, a frequency spectrum for the measurement signal may be determined and compared with reference spectra that have been determined for various known operating conditions, thereby to identify the existing operating conditions. If these are identified, the function of the flowmeter may be corrected on line with the aid of predetermined correction data.
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Citations
23 Claims
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1. A method used in the measurement of a fluid flow comprising the steps of:
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generating a measurement signal representing an instantaneous fluid flow using a flow transducer in a flowmeter; determining amplitude variations of the measurement signal for at least one predetermined period of time; and comparing said determined amplitude variations with reference amplitude variations based on predetermined flow conditions to decide whether the flowmeter measures said fluid flow correctly, wherein said determined amplitude variations and said reference amplitude variations are noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method used in the measurement of a fluid flow comprising the steps of:
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generating a measurement signal representing an instantaneous fluid flow using a flow transducer in a flowmeter; determining the frequency components of the measurement signal for at least one predetermined period of time; and comparing said determined frequency components with at least a first set of reference frequency components to decide whether the flowmeter measures said fluid flow correctly. - View Dependent Claims (10, 11, 12)
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13. A device for measuring fluid flows, comprising:
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a flow transducer which is adapted to emit a measurement signal representing the instantaneous flow, means for determining amplitude variations of the measurement signal; a memory in which is stored at least one set of reference amplitude variations that have been determined for a predetermined flow condition for the flow transducer; and means for comparing the determined amplitude variations of the measurement signal with said at least one set of reference amplitude variations to decide whether the device measures correctly, wherein said determined amplitude variations and said at least one set of reference amplitude variations are noise. - View Dependent Claims (14, 15, 16)
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17. A device for measuring fluid flows, comprising:
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a flow transducer which is adapted to emit a measurement signal representing fluid flows, means for determining frequency components of the measurement signal; a memory in which is stored at least one set of reference frequency components that have been determined for a predetermined flow condition for the flow transducer; and means for comparing the determined frequency components of the measurement signal with said at least one set of reference frequency components to decide whether the device measures correctly. - View Dependent Claims (18, 19, 20)
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21. A method for determining fluid flow comprising the steps of:
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measuring an instantaneous fluid flow rate to generate an output signal; determining noise in the measured instantaneous fluid flow rate; comparing said determined noise with a reference noise in order to determine whether said output signal is accurate. - View Dependent Claims (22, 23)
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Specification