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BS ISO 3455:2021

BS ISO 3455:2021

$102.76

Hydrometry. Calibration of current-meters in straight open tanks

Published By Publication Date Number of Pages
BSI 2021 20
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This document specifies a calibration method for mechanical type, electromagnetic type and acoustic type hydrometric current-meters used for point velocity measurement of flowing water. The method requires towing the instrument through still water in a straight open tank. It includes measuring apparatus, the calibration procedure, the method of presenting the results and the uncertainties associated with the method.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Principle of calibration
4.1 Statement of the principle
8 4.2 Accuracy of the method
4.2.1 Overall uncertainty on the velocity measurement
4.2.2 Requirements for accurate measurements
5 Infrastructure
5.1 Dimensions of the towing tank
5.1.1 General
5.1.2 Length
5.1.3 Depth and width
9 5.2 Towing cart
5.2.1 General
5.2.2 Cart track system
5.2.3 Types of towing carts
5.2.4 Cart operation
10 5.2.5 Cart control
5.3 Measuring equipment
5.3.1 General
5.3.2 Distance measurement
5.3.3 Time measurement
5.3.4 Current-meter velocity measurement
11 5.3.5 Sources of error related to infrastructure
12 5.4 Data acquisition
5.5 Data processing
5.6 Other requirements
6 Calculation of uncertainty
13 7 Calibration procedure
7.1 Calibration of rotating element current-meters
7.1.1 Suspension of the current-meter
7.1.2 Performance of calibration
14 7.1.3 Data analysis
15 7.1.4 Presentation of results
16 7.2 Calibration of electromagnetic current-meters
7.2.1 Instructions for calibration
7.2.2 Mounting the electromagnetic current-meter
7.2.3 Number of calibration points
17 7.2.4 Performance of calibration
7.2.5 Data analysis
7.2.6 Presentation of results
7.3 Calibration of acoustic current-meters for point velocity measurement
7.3.1 Instructions for calibration
18 7.3.2 Mounting the acoustic current-meter
7.3.3 Performance of calibration
7.3.4 Data analysis
7.3.5 Presentation of results
19 Bibliography

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BS ISO 3455:2021
$102.76