Reference conditions and procedures for testing industrial and process measurement transmitters - Part 4: Specific procedures for level transmitters

IEC 62828-4:2020 establishes specific procedures for testing level transmitters used in measuring and control systems for industrial process and machinery control systems. For general test procedures, reference is to be made to IEC 62828-1:2017, applicable to all types of transmitters.
Throughout this document, the term "industrial transmitters" covers all types of transmitters used in measuring and control systems for industrial processes and for machinery.
The requirements of this document are applicable to all level measurement principles.
Detailed description of transmitters is given for two main principles for improved clarity.

Conditions de référence et procédures pour l'essai des transmetteurs de mesure industriels et de processus - Partie 4: Procédures spécifiques pour les transmetteurs de niveau

L'IEC 62828-4:2020 établit les procédures spécifiques d'essai des transmetteurs de niveau utilisés dans les systèmes de mesure et de commande des processus industriels et des systèmes de commande des machines. Pour les procédures d'essais générales, référence doit être faite à l'IEC 62828-1:2017, applicable à tous les types de transmetteurs.
Tout au long du présent document, le terme "transmetteurs industriels" couvre tous les types de transmetteurs utilisés dans les systèmes de mesure et de commande des processus industriels et des machines.
Les exigences du présent document s'appliquent à tous les principes de mesure du niveau.
Par souci de clarté, une description détaillée des transmetteurs est donnée pour deux principes principaux.

General Information

Status
Published
Publication Date
17-Aug-2020
Current Stage
PPUB - Publication issued
Completion Date
18-Aug-2020
Ref Project

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IEC 62828-4
Edition 1.0 2020-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Reference conditions and procedures for testing industrial and process
measurement transmitters –
Part 4: Specific procedures for level transmitters
Conditions de reference et procedures pour l'essai des transmetteurs
de mesure industriels et de processus –
Partie 4: Procédures spécifiques pour les transmetteurs de niveau
IEC 62828-4:2020-08(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62828-4
Edition 1.0 2020-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Reference conditions and procedures for testing industrial and process
measurement transmitters –
Part 4: Specific procedures for level transmitters
Conditions de reference et procedures pour l'essai des transmetteurs
de mesure industriels et de processus –
Partie 4: Procédures spécifiques pour les transmetteurs de niveau
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.200.20; 25.040.40 ISBN 978-2-8322-8757-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62828-4:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 8

3.1 Basic definitions ...................................................................................................... 9

3.2 Level transmitter definitions .................................................................................. 11

3.2.2 Pressure-based level transmitter definitions ................................................... 11

3.2.4 Float level transmitter definitions ................................................................... 12

3.2.6 Microwave/Radar level transmitter definitions ................................................ 12

3.2.7 Optical based level transmitter definitions ...................................................... 12

3.2.9 Capacitance and admittance level transmitter definitions ............................... 13

3.2.10 Mechanical level transmitter definitions ......................................................... 13

3.2.11 Electrical resistance level transmitter definitions ............................................ 14

3.3 Measurement parameters ..................................................................................... 14

3.4 Influence quantity definitions ................................................................................. 14

3.5 Reference to the IEC common data dictionary (CDD) ............................................ 15

4 General description of main types of level transmitters .................................................. 16

4.1 General ................................................................................................................. 16

4.2 Pressure-based level transmitters ......................................................................... 16

4.3 Microwave/radar level transmitter ......................................................................... 18

4.3.1 General ......................................................................................................... 18

4.3.2 Free-space radar level transmitter ................................................................. 18

4.3.3 Guided-wave radar level transmitter .............................................................. 19

5 Reference test conditions .............................................................................................. 20

5.1 General ................................................................................................................. 20

5.2 Standard reference test conditions ........................................................................ 20

5.2.1 General ......................................................................................................... 20

5.2.2 Environmental test conditions ........................................................................ 20

5.2.3 Power supply conditions ................................................................................ 21

5.2.4 Load conditions ............................................................................................. 21

5.2.5 Mounting positions for testing ........................................................................ 21

5.3 Reference test conditions for ambient and process quantities influencing

operation .............................................................................................................. 21

5.3.1 General ......................................................................................................... 21

5.3.2 Process conditions ........................................................................................ 22

5.3.3 Environmental atmospheric conditions ........................................................... 22

5.3.4 Mechanical vibration ...................................................................................... 23

5.3.5 Shock, drop and topple .................................................................................. 23

5.3.6 Power supply ................................................................................................. 23

5.3.7 Electromagnetic compatibility (EMC) ............................................................. 23

5.4 Reference design criteria ...................................................................................... 23

5.4.1 General ......................................................................................................... 23

5.4.2 Enclosure protection against solid, liquid (IP) and impact (IK) ........................ 23

5.4.3 Enclosure protection against corrosive and erosive influences ....................... 23

5.4.4 Electrical safety (insulation resistance, dielectric strength) ............................ 24

5.4.5 Hazardous environment (for application in explosive atmosphere) ................. 24

---------------------- Page: 4 ----------------------
IEC 62828-4:2020 © IEC 2020 – 3 –

5.4.6 Functional safety ........................................................................................... 24

6 Test procedures ............................................................................................................ 24

6.1 General ................................................................................................................. 24

6.1.1 Overview ....................................................................................................... 24

6.1.2 Specific test setups and procedures .............................................................. 25

6.2 Type tests at standard reference conditions .......................................................... 28

6.2.1 General ......................................................................................................... 28

6.2.2 Accuracy and related factors ......................................................................... 29

6.2.3 Static behaviour ............................................................................................. 30

6.2.4 Dynamic behaviour ........................................................................................ 31

6.3 Type tests at operating reference test conditions .................................................. 31

6.3.1 General ......................................................................................................... 31

6.3.2 Ambient temperature effects .......................................................................... 31

6.3.3 Ambient relative humidity effects ................................................................... 32

6.3.4 Vibration effects ............................................................................................ 32

6.3.5 Shock, drop and topple .................................................................................. 32

6.3.6 Accelerated operational life test ..................................................................... 32

6.3.7 EMC tests ...................................................................................................... 32

6.3.8 Further test procedures ................................................................................. 32

6.3.9 Additional test for digital transmitters ............................................................. 32

6.4 Routine tests......................................................................................................... 32

6.5 Acceptance, integration, periodic and maintenance tests ...................................... 32

6.5.1 General ......................................................................................................... 32

6.5.2 Periodical verification .................................................................................... 32

6.5.3 Periodical calibration ..................................................................................... 32

7 Test report and technical documentation ....................................................................... 32

7.1 Test report ............................................................................................................ 32

7.2 Technical documentation ...................................................................................... 33

7.3 Total probable error TPE ....................................................................................... 33

7.3.1 General ......................................................................................................... 33

7.3.2 Specific errors ............................................................................................... 33

Annex A (informative) Main characteristics for level transmitters .......................................... 34

A.1 Properties of level transmitter classes ................................................................... 34

A.1.1 General ......................................................................................................... 34

A.1.2 Pressure-based level transmitter ................................................................... 34

A.1.3 Microwave/Radar level transmitter ................................................................. 36

A.2 Product properties ................................................................................................ 42

A.2.1 Library of properties used in the device classes ............................................. 42

A.2.2 Value lists of properties ................................................................................. 46

Annex B (informative) Example for the calculation of the TPE based on 7.3 and the

MRU and MRE ...................................................................................................................... 48

B.1 Overview of the parameters used for the error calculation ..................................... 48

B.2 Example test report pressure-based level transmitter ............................................ 48

B.2.1 General ......................................................................................................... 48

B.2.2 Test protocol ................................................................................................. 48

B.2.3 DUT characteristics ....................................................................................... 48

B.2.4 TPE calculation ............................................................................................. 49

B.2.5 MRU calculation ............................................................................................ 50

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– 4 – IEC 62828-4:2020 © IEC 2020

B.3 Sub test processes ............................................................................................... 51

B.3.1 Inaccuracy test .............................................................................................. 51

B.3.2 Ambient temperature effect test ..................................................................... 52

B.3.3 Process temperature effect test ..................................................................... 53

B.3.4 Long-term stability test .................................................................................. 54

Bibliography .......................................................................................................................... 56

Figure 1 – Principle diagram of time values and their meanings ............................................ 10

Figure 2 – Principles of pressure-based level transmitters .................................................... 18

Figure 3 – Free-space radar level transmitter ........................................................................ 19

Figure 4 – Guided-wave radar level transmitter ..................................................................... 20

Figure 5 – Schematic example of a test set-up for pressure PMT .......................................... 25

Figure 6 – Typical test set-up for radar level transmitter ........................................................ 26

Figure 7 –Test setup simulated targets and simulated environment....................................... 27

Figure 8 – Example of test setup for wet test ........................................................................ 28

Table 1 – Environmental test conditions ................................................................................ 21

Table 2 – Influence quantities for the various level measurement principles .......................... 22

Table 3 – Number of measurement cycles and number and position of test points ................ 24

Table 4 – Example of statement of maximum error................................................................ 29

Table A.1 – Pressure-based level transmitter ........................................................................ 34

Table A.2 – Free-space radar level transmitter ...................................................................... 37

Table A.3 – Guided-wave radar level transmitter ................................................................... 39

Table A.4 – Library of properties used in the device classes ................................................. 42

Table A.5 – Value lists of properties ..................................................................................... 47

Table B.1 – Abbreviated terms .............................................................................................. 48

Table B.2 – DUT characteristics ............................................................................................ 49

Table B.3 – TPE calculation .................................................................................................. 49

Table B.4 – MRU calculation ................................................................................................. 50

Table B.5 – Reference test devices ....................................................................................... 51

Table B.6 – Reference test conditions ................................................................................... 51

Table B.7 – Test results ........................................................................................................ 52

Table B.8 – Reference test equipment .................................................................................. 52

Table B.9 – Reference test conditions ................................................................................... 53

Table B.10 – Test results ...................................................................................................... 53

Table B.11 – Reference test equipment ................................................................................ 53

Table B.12 – Reference test conditions ................................................................................. 54

Table B.13 – Test results ...................................................................................................... 54

Table B.14 – Reference test equipment ................................................................................ 55

Table B.15 – Reference test conditions ................................................................................. 55

Table B.16 – Test results ...................................................................................................... 55

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IEC 62828-4:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
REFERENCE CONDITIONS AND PROCEDURES FOR TESTING
INDUSTRIAL AND PROCESS MEASUREMENT TRANSMITTERS –
Part 4: Specific procedures for level transmitters
FOREWORD

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International Standard IEC 62828-4 has been prepared by subcommittee 65B: Measurement

and control devices, of IEC technical committee 65: Industrial-process measurement, control

and automation.

The IEC 62828 series cancels and replaces the IEC 60770 series and proposes revisions for

the IEC 61298 series.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65B/1178/FDIS 65B/1182/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 7 ----------------------
– 6 – IEC 62828-4:2020 © IEC 2020
This International Standard is to be used in conjunction with IEC 62828-1:2017.

A list of all parts in the IEC 62828 series, published under the general title Reference conditions

and procedures for testing industrial and process measurement transmitters, can be found on

the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

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of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 8 ----------------------
IEC 62828-4:2020 © IEC 2020 – 7 –
INTRODUCTION

Most of the current IEC standards on industrial measurement transmitters are rather old and

were developed having in mind devices based on analogue technologies. Today’s digital

industrial and process measurement transmitters are quite different from those analogue

transmitters: they include more functions and newer interfaces, both towards the computing

section (mostly digital) and towards the measuring section (mostly mechanical). Even if some

standards dealing with digital transmitters already exist, they are not sufficient, since some

aspects of the performance are not covered by appropriate test methods.

In addition, the existing IEC test standards for industrial and process measurement transmitters

are spread over many documents, so that for manufacturers and users it was difficult,

impractical and time-consuming to identify and select all the standards to be applied to a device

measuring a specific process quantity (pressure, temperature, level, flow, etc.).

To help the manufacturers and users, it was decided to review, complete and reorganize the

existing IEC standards on the industrial and process measurement transmitters and to create a

more suitable, effective and comprehensive standard series that provides, in a systematic way,

all the needed specifications and tests for the different industrial and process measurement

transmitters.

To solve the issues mentioned above and to provide an added value for the stakeholders, the

new standard series on industrial and process measurement transmitters covers the following

main aspects:
• applicable normative references;
• specific terms and definitions;

• typical configurations and architectures for the various types of industrial and measurement

transmitters;
• hardware and software aspects;

• interfaces (to the process, to the operator, to the other measurement and control devices);

• physical, mechanical and electrical requirements and relevant tests; clear definition of the

test categories: type tests, acceptance tests and routine tests;
• performances (their specification, tests and verification);
• environmental protection, hazardous areas application,
...

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