BS EN ISO 20456:2019
$167.15
Measurement of fluid flow in closed conduits. Guidance for the use of electromagnetic flowmeters for conductive liquids
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 42 |
This document applies to industrial electromagnetic flowmeters used for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters running from a mains power supply and those operating from batteries or other sources of power.
This document is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed to work in open channels or pipes running partially full, nor does it apply to the measurement of magnetically permeable slurries or liquid metal applications.
This document does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 8 | Foreword |
| 9 | Introduction |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 Symbols |
| 14 | 5 Theory and basic formulae 6 Construction and principle of operation 6.1 General |
| 15 | 6.2 Sensor |
| 17 | 6.3 Transmitter 6.3.1 General 6.3.2 Alternating magnetic field in the measuring system 6.3.3 Measuring system with applied pulsed DC excitation (simplified model) |
| 18 | 6.3.4 Measuring system with applied AC excitation (simplified model) |
| 19 | 6.4 Flowmeter/Transmitter output 7 Equipment marking 7.1 Recommended data 7.1.1 Sensor |
| 20 | 7.1.2 Transmitter 8 Installation design and practice 8.1 Sensor 8.1.1 Sizing |
| 21 | 8.1.2 Mounting conditions |
| 22 | 8.1.3 Potential equalization — General requirements |
| 23 | 8.1.4 Electrical connections 8.1.5 Sensor mounting |
| 24 | 8.1.6 Installation dimensions for flanged connections |
| 25 | 8.2 Transmitter location |
| 26 | 8.3 Operational considerations 8.3.1 General 8.3.2 Effect of the liquid conductivity 8.3.3 Reynolds number effect 8.3.4 Velocity profile effect 9 Flowmeter calibration, validation, and verification 9.1 Flowmeter calibration 9.2 Flowmeter verification (in-situ electronic verification) |
| 27 | 10 Evaluation of flowmeter performance 10.1 General 10.2 Applications within the scope of other standards 11 Uncertainty analysis |
| 29 | Annex A (informative) Materials for construction of sensors |
| 32 | Annex B (informative) Practical considerations for measuring system with AC and DC excitation |
| 33 | Annex C (informative) Cathodic protection |
| 34 | Annex D (informative) Conversion of nominal diameters from metric to US units |
| 35 | Annex E (informative) Manufacturers’ accuracy specifications |
| 39 | Bibliography |
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BS EN ISO 20456:2019
Measurement of fluid flow in closed conduits. Guidance for the use of electromagnetic flowmeters for…
