ISO 14511:2019

Measurement of fluid flow in closed conduits — Thermal mass flowmeters

This document gives guidelines for the specification, testing, inspection, installation, operation and calibration of thermal mass gas flowmeters for the metering of gases and gas mixtures. It is not applicable to measuring liquid mass flowrates using thermal mass flowmeters. This document is not applicable to hot wire and other hot film anemometers, also used in making point velocity measurements.

Mesure de débit des fluides dans les conduites fermées — Débitmètres massiques par effet thermique

General Information

• Status: Published
• Publication Date: 09-Jan-2019
• ICS: 17.120.10 - Flow in closed conduits
• Technical Committee: ISO/TC 30/SC 5 - Velocity and mass methods
• Drafting Committee: ISO/TC 30/SC 5 - Velocity and mass methods
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Relations

• Revises: ISO 14511:2001 - Measurement of fluid flow in closed conduits — Thermal mass flowmeters
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14511
Second edition
2019-01
Measurement of fluid flow in closed
conduits — Thermal mass flowmeters
Mesure de débit des fluides dans les conduites fermées — Débitmètres
massiques par effet thermique
Reference number
ISO 14511:2019(E)
©
ISO 2019

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ISO 14511:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 14511:2019(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Specific terms . 2
4 Selection of thermal mass flowmeters . 4
5 Capillary thermal mass flowmeter (CTMF meter) . 5
5.1 Principles of measurement . 5
5.2 Typical design . 8
5.3 Applications and limitations of use . 8
5.3.1 Gas property effects . 8
5.3.2 Application and fluid properties . 9
5.3.3 Temperature effects . 9
5.3.4 Pressure effects . 9
5.3.5 Pulsation effects . 9
5.3.6 Pressure loss . 9
5.3.7 Cleanness of the gas . 9
5.3.8 Mounting orientation effects .
...