Reference conditions and procedures for testing industrial and process measurement transmitters - Part 3: Specific procedures for temperature transmitters

IEC 62828-3:2018 establishes specific procedures for testing temperature transmitters used in measuring and control systems for industrial process and for machinery control systems.
When the process measurement transmitter features the temperature transmitter separated from the sensing element, the standard applies only to the temperature transmitter without the sensing element. In the case of a device where the sensing element is fully integrated with the temperature transmitter, the standard applies to the complete device. For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of industrial and process measurement transmitters (PMT). The sensing element itself as well as radiation thermometers are excluded from the scope of this document. The IEC 62828 series cancels and replaces the IEC 60770 series and proposes revisions for the IEC 61298 series.
NOTE In industrial and process applications to indicate the process measurement transmitters, it is common also to use the terms “industrial transmitters”, or “process transmitters”.

Conditions de référence et procédures pour l'essai des transmetteurs de mesure industrielle et de processus - Partie 3: Procédures spécifiques pour les transmetteurs de température

IEC 62828-3:2018 établit les procédures spécifiques d'essais des transmetteurs de température utilisés dans les systèmes de mesure et de commande des processus industriels et des machines.
Lorsque le transmetteur de mesure de processus possède un transmetteur de température séparé du capteur, la norme s'applique uniquement au transmetteur de température sans le capteur. Dans le cas d'un appareil dont le capteur est totalement intégré au transmetteur de température, la norme s'applique à l'ensemble de l'appareil. Pour les procédures d'essais générales, il est fait référence à l'IEC 62828-1, qui est applicable à tous les types de transmetteurs de mesure industrielle et de processus (PMT, abréviation dérivée de l'anglais "process measurement transmitters"). Le capteur lui-même et les thermomètres à rayonnement sont exclus du domaine d'application du présent document. La série IEC 62828 annule et remplace la série IEC 60770 et propose des révisions pour la série IEC 61298.
NOTE Dans les applications industrielles et de processus, pour indiquer les transmetteurs de mesure de processus, les termes "transmetteurs industriels" ou "transmetteurs de processus" sont également fréquemment utilises.

General Information

Status
Published
Publication Date
17-Apr-2018
Current Stage
PPUB - Publication issued
Start Date
18-Apr-2018
Completion Date
18-Apr-2018
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IEC 62828-3
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Reference conditions and procedures for testing industrial and process
measurement transmitters –
Part 3: Specific procedures for temperature transmitters
Conditions de référence et procédures pour l'essai des transmetteurs de mesure
industrielle et de processus –
Partie 3: Procédures spécifiques pour les transmetteurs de température
IEC 62828-3:2018-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62828-3
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Reference conditions and procedures for testing industrial and process
measurement transmitters –
Part 3: Specific procedures for temperature transmitters
Conditions de référence et procédures pour l'essai des transmetteurs de mesure
industrielle et de processus –
Partie 3: Procédures spécifiques pour les transmetteurs de température
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.200.20; 25.040.40 ISBN 978-2-8322-5586-5

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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62828-3:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

3.1 Definitions regarding temperature ........................................................................... 7

4 General description of the device .................................................................................... 8

5 Reference test conditions ................................................................................................ 8

6 Test procedures .............................................................................................................. 9

6.1 General ................................................................................................................... 9

6.2 Tests at standard and operating reference test conditions..................................... 10

6.2.1 General ......................................................................................................... 10

6.2.2 Suitable methods for accuracy verification in acceptance and routine

tests .............................................................................................................. 11

7 Technical documentation ............................................................................................... 12

7.1 General ................................................................................................................. 12

7.2 Total probable error .............................................................................................. 12

Annex A (informative) Temperature PMT ............................................................................. 13

Bibliography .......................................................................................................................... 14

Figure 1 – Schematic example of test set-up for temperature measurement transmitters ........ 9

Figure 2 – Examples of terminals connection for RTD and TC ............................................... 10

Figure 3 – Example of measured error plot ........................................................................... 11

Table 1 – Example of measured errors.................................................................................. 11

---------------------- Page: 4 ----------------------
IEC 62828-3:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
REFERENCE CONDITIONS AND PROCEDURES FOR TESTING
INDUSTRIAL AND PROCESS MEASUREMENT TRANSMITTERS –
Part 3: Specific procedures for temperature transmitters
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62828-3 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.

In IEC 61298, all parts related to PMT’s will be deleted, leaving all the requirements regarding

all devices but PMT’s.
---------------------- Page: 5 ----------------------
– 4 – IEC 62828-3:2018 © IEC 2018
The text of this International Standard is based on the following documents:
FDIS Report on voting
65B/1110A/FDIS 65B/1114/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.

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

that it contains colours which are considered to be useful for the correct

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

colour printer.
---------------------- Page: 6 ----------------------
IEC 62828-3:2018 © IEC 2018 – 5 –
INTRODUCTION

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

rather old and were developed having in mind devices based on analogue technologies. Many

industrial and process measurement transmitters are meanwhile evolved and are quite

different from those analogue transmitters: they are often digital and include more functions

and newer interfaces, both towards the computing section (mostly digital electronic) and

towards the measuring section (mostly mechanical). Even if some standards dealing with

digital process measurement transmitters already exist, they are not sufficient, since some

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

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

are spread over many documents, so that for manufacturers and users it is 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, flow, level, etc.).

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

relevant IEC standards and to create a more suitable, effective and comprehensive standard

series that provides in a systematic way all specifications and tests required for 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 process

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;
• performance (its specification, tests and verification);

• environmental protection, hazardous areas application, functional safety, etc.;

• structure of the test report and of the technical documentation.

To cover in a systematic way all the topics to be addressed, the standard series is organized

in several parts. At the moment of the publication of this document, the IEC 62828 series

consists of the following parts:
• IEC 62828-1: General procedures for all types of transmitters
• IEC 62828-2: Specific procedures for pressure transmitters
• IEC 62828-3: Specific procedures for temperature transmitters
• IEC 62828-4: Specific procedures for level transmitters
• IEC 62828-5: Specific procedures for flow transmitters
---------------------- Page: 7 ----------------------
– 6 – IEC 62828-3:2018 © IEC 2018

In preparing the IEC 62828 series many test procedures were taken, with the necessary

improvements, from the IEC 61298 series. As the actual IEC 61298 series is applicable to all

process measurement and control devices, when the IEC 62828 series is completed the

IEC 61298 series will be revised to harmonise it with the IEC 62828 series, taking out from its

scope the industrial and process measurement transmitters. During the time when 61298

scope is being updated, the new series IEC 62828 takes precedence for industrial and

process measurement transmitters.
When the IEC 62828 series is published, the IEC 60770 series will be withdrawn.
---------------------- Page: 8 ----------------------
IEC 62828-3:2018 © IEC 2018 – 7 –
REFERENCE CONDITIONS AND PROCEDURES FOR TESTING
INDUSTRIAL AND PROCESS MEASUREMENT TRANSMITTERS –
Part 3: Specific procedures for temperature transmitters
1 Scope

This part of IEC 62828 establishes specific procedures for testing temperature transmitters

used in measuring and control systems for industrial process and for machinery control

systems.

When the process measurement transmitter features the temperature transmitter separated

from the sensing element (RTD, TC, etc.), the standard applies only to the temperature

transmitter without the sensing element. In case of device where the sensing element is fully

integrated with the temperature transmitter, the standard applies to the complete device.

For general test procedures, reference is made to IEC 62828-1, which is applicable to all

types of industrial and process measurement transmitters (PMT).

NOTE In the industrial and process applications, to indicate the process measurement transmitters, it is common

also to use the terms “industrial transmitters”, or “process transmitters”.

The sensing element itself (e.g., RTD, TC, etc.) as well as radiation thermometers are

excluded from the scope of this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
IEC 60584 (all parts), Thermocouples

IEC 62828-1:2017, Reference conditions and procedures for testing industrial and process

measurement transmitters – Part 1: General procedures for all types of transmitters

3 Terms and definitions
3.1 Definitions regarding temperature

For the purposes of this document, the terms and definitions given in IEC 62828-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
---------------------- Page: 9 ----------------------
– 8 – IEC 62828-3:2018 © IEC 2018
3.1.1
cold junction compensation
CJC
suitable automatic system to compensate the thermocouple EMF to 0 °C
3.1.2
International Temperature Scale of 1990
ITS 90

temperature scale adopted by the International Committee on Weights and Measures (CIPM)

in 1989 for the purpose of practical measurements

Note 1 to entry: The quantities corresponding to thermodynamic temperature and Celsius temperature defined by

this scale are denoted T and t , respectively, where t = T – T with T = 273,15 K.

90 90 90 90 0 0

Note 2 to entry: The units for T and t are the kelvin, symbol K, and the degree Celsius, symbol °C,

90 90
respectively.
[SOURCE: IEC 60050-113:2011, 113-04-18]
3.1.3
resistance temperature detector
RTD

temperature sensor containing a sensing element made of platinum or other metals whose

resistance changes with temperature
Note 1 to entry: Resistance thermometers are often called RTDs.

Note 2 to entry: A platinum resistance thermometer (PRT) is an RTD that has a sensing element made of

platinum; other common RTDs are nickel resistance thermometers (NRT) and copper resistance thermometers

(CRT), with the sensing element made of nickel or copper respectively.
[SOURCE: IEC 62465:2010, 3.20, modified – The notes have been added.]
3.1.4
thermocouple

pair of conductors of dissimilar materials joined at one end and forming part of an

arrangement using the thermoelectric effect for temperature measurement

Note 1 to entry: The production of an electromotive force (EMF) due to a temperature gradient along a conductor

is called thermoelectric effect (or Seebeck effect).
[SOURCE: IEC 60584-1:2013, 2.3, modified – The abbreviation and notes have been
added.]
4 General description of the device

The general description outlined in Clause 4 and Annex A of IEC 62828-1:2017 is applicable.

In Annex A of this document, some additional information is only given regarding the

measuring section of a temperature industrial and process measurement transmitter

(temperature PMT).
5 Reference test conditions

To verify the influence of external quantities on accuracy, as well as the mechanical and

electrical conditions which a device can withstand and still work within specification, the

corresponding clause of IEC 62828-1 applies, both for standard reference test conditions and

for operating reference test conditions.
---------------------- Page: 10 ----------------------
IEC 62828-3:2018 © IEC 2018 – 9 –
6 Test procedures
6.1 General

Clause 6 of IEC 62828-1:2017 applies, with the following additional requirements.

The general schematic test set-up for a typical temperature PMT is reported in Figure 1.

NOTE 1 Annex A provides information on the several typologies of typical temperature transmitters.

Optional
Power supply
wireless output
(internal or
TC CJC
signal
external)
Standard source PMT Analogue or
generator for under digital output
RTD and TC test signal
Input
Output
terminal
terminal
IEC
Figure 1 – Schematic example of test set-up for
temperature measurement transmitters

NOTE 2 The test source generator for RTD is a decade resistance standard or a multifunction temperature

calibrator.

NOTE 3 The test source generator for TC is a voltage generator or a multifunction temperature calibrator.

NOTE 4 To compensate the TC signal for the reference temperature of 0 °C, Cold Junction Compensation CJC

may be used for TC transmitters.

NOTE 5 In case of temperature sensing element fully integrated into the temperature PMT, a reference

temperature is used.

NOTE 6 The optional digital output signal is provided for smart and intelligent transmitters and is detected by

handheld or PC communicator (configurator).

Figure 2 shows an example of terminal connections for a generic temperature PMT. In this

figure, the supply and the output terminals (+, -) are on the upper side, and the input

connections to the RTD or TC sensors (1, 2, 3, 4) are on the lower side.

For testing, the RTD and TC shall be replaced by the relevant test source generator.

---------------------- Page: 11 ----------------------
– 10 – IEC 62828-3:2018 © IEC 2018
+ -
2 4 3 1
2 4 3 1
RTD
IEC IEC
Two wire connection Positive
Option for third wire connection Negative
Option for fourth wire connection
a) Connection example for RTD b) Connection example for TC
Figure 2 – Examples of terminals connection for RTD and TC

NOTE 7 The RTD can be simulated as a two, three or four-wire connection. For platinum RTD, more details are

given in IEC 60751.

NOTE 8 The TC is simulated using specific extension or compensating cables. More details are given in

IEC 60584-1 and IEC 60584-3.

For specifications and tolerances of temperature sensors used with temperature PMTs, see:

• IEC 60584 and IEC 62460 for TC sensors;
• IEC 60751 for RTD sensors.
6.2 Tests at standard and operating reference test conditions
6.2.1 General

For the majority of the tests, the corresponding clause of Part 1 applies, in particular see:

• Annex B in IEC 62828-1:2017 for the summary of the tests at standard reference
conditions;

• Annex C in IEC 62828-1:2017 for the summary of the tests at operating reference

conditions.

The tests are conducted on a test set-up similar to the one shown schematically in Figure 1.

The test source generator (in case of sensing element not integrated into the temperature

PMT) or the reference temperature (in case of sensing element fully integrated into the

temperature PMT) needed to stimulate the response of the device under test shall have

characteristics and performances suitable to the tests required.

In addition to the error due to the sensing element, the process measurement transmitter shall

not introduce an additional error greater than 50 % of the error relevant to the pertinent

tolerance class of the sensing element.

The following specific tests for temperature transmitters shall be performed in addition.

---------------------- Page: 12 ----------------------
IEC 62828-3:2018 © IEC 2018 – 11 –
6.2.2 Suitable methods for accuracy verification in acceptance and routine tests
6.2.2.1 General

The input-output characteristic shall be measured under reference conditions in one

measurement cycle, in only one full range direction traversing, either increasing or

decreasing.

For this, at least five points of measurement shall be evenly distributed over the range; they

shall include points at or near (within 10 % of span) the 0 % and 100 % values of the span.

6.2.2.2 Measurement procedure

The test shall be performed in the following way. Initially, an input signal equal to the lower

range value is generated and the value of the corresponding input and output signal is noted.

Then the input signal is slowly (the rate of change depends on the PMT) increased to reach

without overshoot the first test point. After a sufficient stabilization period (e.g. reaching a

steady state), the value of the corresponding input and output signal is noted. The operation

is repeated for all the predetermined values up to 100 % of the input span.
6.2.2.3 Data analysis

Applying 6.2.2.1 and 6.2.2.2, the difference between the output signal values obtained at each

test point and the corresponding true values are recorded as measured errors. The measured

errors shall be expressed as percent of the nominal output span or better in the engineering

unit °C or K.

All measured errors can be shown in a tabular form (see Table 1) and presented graphically

(see Figure 3).
From Table 1, the maximum measured error found is -0,10 °C at 80 °C of output.
Table 1 – Example of measured errors
Input (°C) 0 20 40 60 80 100
Output (°C) 0,00 20,03 39,98 59,91 79,90 100,05
Maximum measured error (°C) 0,00 0,03 –0,02 –0,09 –0,10 0,05
0,15
0,1
0,05
0 10 20 30 40 50 60 70 80 90 100
Maximum
measured
–0,05
error
–0,1
–0,15
Output (°C)
IEC
Figure 3 – Example of measured error plot
Error (°C)
---------------------- Page: 13 ----------------------
– 12 – IEC 62828-3:2018 © IEC 2018
7 Technical documentation
7.1 General
There are no specific additional requirements. See IEC 62828-1 for the technical
documentation to be prepared.
7.2 Total probable error

General information on the calculation of the total probable error is given in Clause 7 of

IEC 62828-1:2017. For temperature PMT, usually the most prominent source of error is the

ambient temperature’s effect on the electronics, yet other influence parameters (e.g. vibration

and load) could also have some influence.

To estimate the total error for temperature PMTs it is necessary to consider the overall

contribution of the different errors, in particular accuracy, ambient temperature effects, zero

and span setting, long-term stabil
...

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