ISO 14511:2019
(Main)Measurement of fluid flow in closed conduits — Thermal mass flowmeters
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
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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 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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 . 9
5.3.9 Installation effects for flow profile .10
5.3.10 Vibrations — Hydraulic and mechanical .10
5.3.11 Valves .10
5.4 Meter selection .10
5.4.1 Principal requirement .10
5.4.2 Performance specifications .10
5.4.3 Physical specifications .10
5.4.4 Meter ratings .11
5.4.5 Application and fluid properties .11
5.4.6 Corrosion .11
5.4.7 Transmitter specifications .11
5.5 Installation and commissioning .11
5.5.1 General considerations .11
5.5.2 Safety .12
5.5.3 Mechanical stress .12
5.5.4 Process adjustment .12
6 Insertion and/or in-line thermal mass flowmeter (ITMF meter) .13
6.1 Principle of measurement .13
6.1.1 General.13
6.1.2 Constant power method .14
6.1.3 Constant-temperature-differential method .15
6.2 Typical design .16
6.2.1 ITMF basic design .16
6.2.2 In-line ITMF meter .16
6.2.3 Insertion-ITMF meter .17
6.2.4 Multi-point insertion-ITMF meter .18
6.3 Applications and limitations of use .18
6.3.1 General remarks .18
6.3.2 Normalized volume flowrate units.18
6.3.3 Fluid property effects .18
6.3.4 Temperature effects .19
6.3.5 Pressure effects .19
6.3.6 Fluid phase .19
6.3.7 Bi-directional flow .19
6.3.8 Pulsation effects .19
6.3.9 Pressure loss .19
6.3.10 Sensor contamination .19
6.3.11 Mounting orientation effects .19
6.3.12 Installation effects .20
6.3.13 Conduit vibrations .20
6.4 Meter selection .20
6.4.1 General.20
6.4.2 Performance specifications .20
6.4.3 Physical specifications .21
6.4.4 Meter ratings .21
6.4.5 Application and fluid properties .21
6.4.6 Corrosion .22
6.4.7 Transmitter specifications .22
6.5 Installation and commissioning .22
6.5.1 General considerations .22
6.5.2 Cleaning .22
6.5.3 Safety .22
6.5.4 Mechanical stress .23
6.5.5 Process conditions .24
7 Instrument specification sheet and marking .24
7.1 User specification sheet .
...
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 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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 . 9
5.3.9 Installation effects for flow profile .10
5.3.10 Vibrations — Hydraulic and mechanical .10
5.3.11 Valves .10
5.4 Meter selection .10
5.4.1 Principal requirement .10
5.4.2 Performance specifications .10
5.4.3 Physical specifications .10
5.4.4 Meter ratings .11
5.4.5 Application and fluid properties .11
5.4.6 Corrosion .11
5.4.7 Transmitter specifications .11
5.5 Installation and commissioning .11
5.5.1 General considerations .11
5.5.2 Safety .12
5.5.3 Mechanical stress .12
5.5.4 Process adjustment .12
6 Insertion and/or in-line thermal mass flowmeter (ITMF meter) .13
6.1 Principle of measurement .13
6.1.1 General.13
6.1.2 Constant power method .14
6.1.3 Constant-temperature-differential method .15
6.2 Typical design .16
6.2.1 ITMF basic design .16
6.2.2 In-line ITMF meter .16
6.2.3 Insertion-ITMF meter .17
6.2.4 Multi-point insertion-ITMF meter .18
6.3 Applications and limitations of use .18
6.3.1 General remarks .18
6.3.2 Normalized volume flowrate units.18
6.3.3 Fluid property effects .18
6.3.4 Temperature effects .19
6.3.5 Pressure effects .19
6.3.6 Fluid phase .19
6.3.7 Bi-directional flow .19
6.3.8 Pulsation effects .19
6.3.9 Pressure loss .19
6.3.10 Sensor contamination .19
6.3.11 Mounting orientation effects .19
6.3.12 Installation effects .20
6.3.13 Conduit vibrations .20
6.4 Meter selection .20
6.4.1 General.20
6.4.2 Performance specifications .20
6.4.3 Physical specifications .21
6.4.4 Meter ratings .21
6.4.5 Application and fluid properties .21
6.4.6 Corrosion .22
6.4.7 Transmitter specifications .22
6.5 Installation and commissioning .22
6.5.1 General considerations .22
6.5.2 Cleaning .22
6.5.3 Safety .22
6.5.4 Mechanical stress .23
6.5.5 Process conditions .24
7 Instrument specification sheet and marking .24
7.1 User specification sheet .
...
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