Foreword
1 Scope
2 Normative references
3 Terms and symbols
3.1 Terms
3.2 Symbols
4 Principle
4.1 General
4.2 Measurement of the measuring cross-section
4.3 Measurement of local velocities
4.4 Location and number of measuring points in the
cross-section
5 Description of the current-meter
6 Requirements for the use of current-meters
6.1 Selection of the measuring cross-section
6.2 Devices for improving flow conditions
6.3 Calibration of the current-meter
6.4 Limits of use
6.5 Inspection and maintenance of current-meters
7 Setting of current-meters into the conduit
7.1 Setting of current-meters
7.2 Mounting in a circular cross-section
7.3 Mounting in a rectangular cross-section
8 Determination of the mean axial fluid velocity by graphical
integration of the velocity area
8.1 General
8.2 Circular cross-sections
8.3 Rectangular cross-sections
9 Determination of the mean axial fluid velocity by numerical
integration of the velocity area
9.1 General
9.2 Circular cross-sections
9.3 Rectangular cross-sections
10 Determination of the mean axial fluid velocity by
arithmetical methods
10.1 General
10.2 Log-linear method
10.3 Log-Chebyshev method
11 Uncertainty in the measurement of flow-rate
11.1 General
11.2 Sources of error in local velocity measurements
11.3 Sources of error in estimation of flow-rate
11.4 Propagation of errors
11.5 Presentation of results
11.6 Calculation of uncertainty
Annex A (normative) - Measuring sections other than circular
or rectangular sections
Annex B (normative) - Corrections for blockage effect
Annex C (normative) - Recommendations for the selection of
the type of current-meter and mounting strut
Annex D (normative) - Example of measuring point
distribution along a radius for velocity
measurement in a conduit of circular
cross-section in the case of the graphical
and numerical methods
Annex E (normative) - Determination of boundary layer
coefficient, m, for extrapolation near the
wall
Annex F (normative) - Definition of terms and procedures
used in the uncertainty calculation
Annex G (normative) - Student's t distribution
Annex H (informative) - Examples of values of component
uncertainties
Annex J (informative) - Example of calculation of the
uncertainty in the flow-rate measurement
using current-meters