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BS 7118-1:1990

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices Linear calibration relationships
Available format(s)

Hardcopy , PDF

Superseded date

15-07-1997

Language(s)

English

Published date

31-10-1990

Committees responsible
National foreword
Method
1. Scope
2. Normative references
3. Symbols and definitions
4. General
5. Uncertainties in individual calibration points
6. Linearity of the calibration graph
7. Fitting the best straight line
8. Detection of outliers
9. Uncertainty of calibration
10. Uncertainty in the use of the calibration graph for
    a single measurement of flow-rate
11. Uncertainty in the average of several flow-rate
    measurements
Annexes
A. Example for a closed conduit
B. Example for an open channel
C. Uncertainty associated with the calibration
    coefficient when using a calibrated or standardized
    flow-meter
D. Extrapolation of the calibration graph
E. Tests for outliers
F. Guidelines for the application of ISO 7066-1
G. Bibliography
Tables
1. Values of the F distribution for selected degrees
    of freedom - Probability level 0,05
2. Value of Student's t at 95% confidence level
A.1 Calibration results
A.2 Component uncertainties
A.3 Quantities required to calculate uncertainty in
    the calibration graph
B.1 Example of the manual computation of the stage-
    discharge relation by the method of least squares
B.2 Tabulated values required to calculate se and smr
B.3 Example of the computation for the uncertainty in
    the daily mean discharge using hourly values of
    discharge
B.4 Tabulated values required to calculate se and X(v)
E.1 Testing of multiple outliers
E.2 Critical values for the extreme deviation outlier
    test
E.3 Polynomial coefficients
Figures
1. Example of grouping data to establish linearity of
    best fit straight line
2. Basic principles for best-fit straight lines
A.1 Discharge coefficient as a function of the Reynolds
    number
A.2 Discharge coefficient as a function of 10 cubed /
    ((Red) to the power 1/2)
B.1 Stage-discharge curve
B.2 Current-meter rating
C.1 Contributions to uncertainty in the value used for C
D.1 Extrapolation of calibration graph method

Guidance on how the uncertainty in a calibration curve of a flow meter, or in the mean of a number of measurements of the same flow rate, may be calculated, in accordance with the principles stated in BS 5844.

Committee
CPI/30
DevelopmentNote
BS DRAFT 96/211595 DC REFERS TO A REVISION
DocumentType
Standard
Pages
48
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

BS 6199-1.2:1991 Measurement of liquid flow in closed conduits using weighing and volumetric methods. Weighing method Procedures for checking static weighing systems
BS EN 60041:1995 Field acceptance tests to determine the hydraulic performance of hydraulic turbines, storage pumps and pump-turbines
BS EN 29104:1993 Measurement of fluid flow in closed conduits. Methods of evaluating the performance of electromagnetic flow-meters for liquids
BS 3680-3B:1997 Measurement of liquid flow in open channels. Stream flow measurement Guide for the establishment and operation of a gauging station
BS 7825-2:1996 Calibration of rubber and plastics test equipment Calibration procedures
EN 29104 : 1993 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - METHODS OF EVALUATING THE PERFORMANCE OF ELECTROMAGNETIC FLOW-METERS FOR LIQUIDS

BS 7118-2:1989 Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices Non-linear calibration relationships
BS 3680-1:1983 Measurement of liquid flow in open channels. Glossary of terms
BS 3680-3C:1983 Measurement of liquid flow in open channels. Stream flow measurement Methods for determination of the stage-discharge relation

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