Expression of performance of fluorometric oxygen analyzers in liquid media (IEC 62703:2013)

This International Standard is applicable to fluorometric oxygen analyzers used for the continuous determination of dissolved oxygen partial pressure or concentration. It applies to fluorometric oxygen analyzers suitable for use in water containing liquids, ultrapure waters, fresh or potable water, sea water or other aqueous solutions, industrial or municipal waste water from water bodies (e.g. lakes, rivers, estuaries) as well as for industrial process streams and process liquids. Whilst in principle fluorometric oxygen-analyzers are applicable in gaseous phases, the expression of performance in the gas-phase will not be subject of this standard. The sensor unit of a fluorometric oxygen analyzer being in contact with the media to be measured contains a luminophore in a polymer-membrane permeable for oxygen or within other oxygen permeable materials (or substrates). This standard specifies the terminology, definitions, requirements for statements by manufacturers and tests for fluorometric oxygen analyzers. This standard is in accordance with the general principles set out in IEC 60359 and IEC 60770 series. This standard is applicable to analyzers specified for permanent installation installation in any location (indoors or outdoors) utilizing an on-line measurement technique. Safety requirements are dealt with in IEC 61010-1. Standard range of analogue d.c. current signals used in process control systems are dealt with in IEC 60381-1. Specifications for values for the testing of influence quantities can be found in IEC 60654 series. Requirements for documentation to be supplied with instruments are dealt with in IEC 61187. Requirements for general principles concerning quantities, units and symbols are dealt with in ISO 80000-1:2009. The object of IEC 62703 is: - to specify the general aspects in the terminology and definitions related to the performance of fluorometric oxygen analyzers used for the continuous determination of dissolved oxygen partial pressure or concentration in liquid media; - to unify methods used in making and verifying statements on the functional performance of such analyzers; - to specify which tests should be performed in order to determine the functional performance and how such tests should be carried out; - to provide basic documents to support the application of standards of quality assurance within ISO 9001.

Angabe zum Betriebsverhalten von fluorometrischen Sauerstoffanalysatoren in flüssigen Medien (IEC 62703:2013)

Expression des performances des analyseurs d'oxygène fluormétriques en milieu liquide (IEC 62703:2013)

La CEI 62703:2013 spécifie les aspects généraux de la terminologie et des définitions liées aux performances des analyseurs d'oxygène fluorométriques utilisés pour la détermination continue de la pression ou de la concentration partielle d'oxygène dissous en milieu liquide; unifie les méthodes utilisées en fournissant et en vérifiant les indications relatives aux performances fonctionnelles de ces analyseurs; spécifie les essais qu'il convient d'effectuer afin de déterminer les performances fonctionnelles et la manière dont il convient de réaliser ces essais et stipule des documents de base pour supporter l'usage des normes d'assurance de la qualité de l'ISO 9001.

Izražanje zmogljivosti fluorometričnih analizatorjev kisika v tekočinah (IEC 62703:2013)

Ta mednarodni standard se uporablja za fluorometrične analizatorje kisika, ki se uporabljajo za neprekinjeno določanje delnega tlaka ali koncentracije raztopljenega kisika. Velja za fluorometrične analizatorje kisika, primerne za uporabo v tekočinah, ki vsebujejo vodo, ultra čistih vodah, sladki ali pitni vodi, morski vodi ali drugih vodnih raztopinah, industrijskih ali gospodinjskih odpadnih vodah iz vodnih teles (npr. jezera, reke, ustja) ter za industrijske procesne tokove in procesne tekočine. Čeprav se fluorometrični analizatorji kisika načeloma uporabljajo v plinastih fazah, izražanje delovanja v plinasti fazi ni predmet tega standarda. Senzorska enota fluorometričnega analizatorja kisika, ki je v stiku z medijem za merjenje, vsebuje luminofor v membrani iz polimera, ki je prepustna za kisik, ali v drugih za kisik prepustnih materialih (ali substratih). Ta standard določa terminologijo, definicije, zahteve za navedbe proizvajalcev in preskuse za fluorometrične analizatorje kisika. Ta standard je v skladu s splošnimi načeli iz skupine standardov IEC 60359 in IEC 60770. Ta standard se uporablja za analizatorje, ki so določeni za stalno namestitev na katerem koli mestu (znotraj ali zunaj) z uporabo merilne tehnike s povezavo. Varnostne zahteve so obravnavane v standardu IEC 61010-1. Standardni obseg signalov analognega enosmernega toka, ki se uporabljajo v sistemih za nadzor procesa, je obravnavan v standardu IEC 60381-1. Specifikacije za vrednosti za preskušanje vplivnih veličin so na voljo v skupini standardov IEC 60654. Zahteve za dokumentacijo, ki jo je treba priložiti instrumentom, so obravnavane v standardu IEC 61187. Zahteve za splošna načela glede veličin, enot in simbolov, so obravnavane v standardu ISO 80000-1:2009. Namen standarda IEC 62703 je: – določiti splošne vidike v terminologiji in definicijah v zvezi z delovanjem fluorometričnih analizatorjev kisika, ki se uporabljajo za neprekinjeno določanje delnega tlaka ali koncentracije kisika v tekočih medijih; – poenotiti metode, ki se uporabljajo pri ustvarjanju in preverjanju navedb o funkcijski zmogljivosti takšnih analizatorjev; – določiti, katere preskuse je treba opraviti, da se določi funkcijska zmogljivost, in kako jih je treba opraviti; – zagotoviti osnovne dokumente za podporo uporabe standardov za zagotavljanje kakovosti v sklopu standarda ISO 9001.

General Information

Status
Published
Publication Date
10-Sep-2013
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Sep-2013
Due Date
08-Nov-2013
Completion Date
11-Sep-2013

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SLOVENSKI STANDARD
SIST EN 62703:2013
01-oktober-2013
,]UDåDQMH]PRJOMLYRVWLIOXRURPHWULþQLKDQDOL]DWRUMHYNLVLNDYWHNRþLQDK ,(&

Expression of performance of fluorometric oxygen analyzers in liquid media (IEC
62703:2013)

Angabe zum Betriebsverhalten von fluorometrischen Sauerstoffanalysatoren in flüssigen

Medien (IEC 62703:2013)

Expression des performances des analyseurs d'oxygène fluormétriques en milieu liquide

(IEC 62703:2013)
Ta slovenski standard je istoveten z: EN 62703:2013
ICS:
17.020 Meroslovje in merjenje na Metrology and measurement
splošno in general
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
SIST EN 62703:2013 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 62703:2013
---------------------- Page: 2 ----------------------
SIST EN 62703:2013
EUROPEAN STANDARD
EN 62703
NORME EUROPÉENNE
August 2013
EUROPÄISCHE NORM
ICS 17.020; 71.040; 71.120
English version
Expression of performance of fluorometric oxygen analyzers in liquid
media
(IEC 62703:2013)
Expression des performances des Angabe zum Betriebsverhalten von
analyseurs d'oxygène fluormétriques en fluorometrischen Sauerstoffanalysatoren
milieu liquide in flüssigen Medien
(CEI 62703:2013) (IEC 62703:2013)

This European Standard was approved by CENELEC on 2013-08-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62703:2013 E
---------------------- Page: 3 ----------------------
SIST EN 62703:2013
EN 62703:2013 - 2 -
Foreword

The text of document 65B/867/FDIS, future edition 1 of IEC 62703, prepared by IEC/TC 65B

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

control and automation" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN 62703:2013.
The following dates are fixed:
(dop) 2014-05-01
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-08-01
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 62703:2013 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60654 (all parts) NOTE Harmonised as EN 60654 (all parts).
IEC 60654-1 NOTE Harmonised as EN 60654-1.
IEC 60770-1 NOTE Harmonised as EN 60770-1.
IEC 61207-1:2010 NOTE Harmonised as EN 61207-1:2010.
IEC 61207-2 NOTE Harmonised as EN 61207-2.
IEC 61298 (all parts) NOTE Harmonised as EN 61298 (all parts).
IEC 61326 (all parts) NOTE Harmonised as EN 61326 (all parts).
ISO 5814:2012 NOTE Harmonised as EN ISO 5814:2012.
ISO 7888:1985 NOTE Harmonised as EN 27888:1993.
ISO 9001 NOTE Harmonised as EN ISO 9001.
ISO 80000-1:2009 NOTE Harmonised as EN ISO 80000-1:2013.
---------------------- Page: 4 ----------------------
SIST EN 62703:2013
- 3 - EN 62703:2013
Annex ZA
(normative)
Normative references to i nternational publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60068 series Environmental testing EN 60068 series
IEC 60359 2001 Electrical and electronic measurement EN 60359 2002
equipment - Expression of performance
IEC 61010-1 - Safety requirements for electrical equipment - -
for measurement, control and laboratory use -
Part 1: General requirements
IEC 61187 (mod) - Electrical and electronic measuring EN 61187 -
equipment - Documentation + Corr. March
---------------------- Page: 5 ----------------------
SIST EN 62703:2013
---------------------- Page: 6 ----------------------
SIST EN 62703:2013
IEC 62703
Edition 1.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Expression of performance of fluorometric oxygen analyzers in liquid media
Expression des performances des analyseurs d'oxygène fluorométriques en
milieu liquide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 17.020; 71.04; 71.120 ISBN 978-2-83220-835-9

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: 7 ----------------------
SIST EN 62703:2013
– 2 – 62703  IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope ............................................................................................................................... 6

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

3 Terms, definitions, quantities and units ............................................................................. 7

3.1 Basic terms and definitions ...................................................................................... 7

3.2 General terms and definitions of devices and operations ....................................... 10

3.3 Terms and definitions for manners of expression ................................................... 11

3.4 Specific terms and definitions for fluorometry ........................................................ 13

3.5 Specific terms and definitions for fluorometric oxygen analyzers ........................... 15

3.6 Influence quantities for fluorometric oxygen analyzers ........................................... 17

3.7 Quantities and units .............................................................................................. 18

4 Procedure for specification ............................................................................................. 19

4.1 Specification of values and ranges for fluorometric oxygen analyzers .................... 19

4.2 Operation, storage and transport conditions .......................................................... 19

4.2.1 Rated operating conditions ........................................................................ 19

4.2.2 Performance under rated operating conditions ........................................... 19

4.2.3 Performance under rated operating conditions while inoperative ................ 19

4.2.4 Construction materials ............................................................................... 19

4.3 Performance characteristics requiring statements of rated values .......................... 19

4.4 Uncertainty limits ................................................................................................... 20

4.4.1 Limits of intrinsic uncertainty ..................................................................... 20

4.4.2 Interference uncertainties .......................................................................... 20

4.4.3 Repeatability ............................................................................................. 20

4.4.4 Drift ........................................................................................................... 20

5 Test methods.................................................................................................................. 20

5.1 Test procedures .................................................................................................... 20

5.2 Influence quantities ............................................................................................... 20

5.3 Operational conditions ........................................................................................... 21

5.4 Calibration ............................................................................................................. 21

5.5 Reference conditions ............................................................................................. 21

5.5.1 Reference conditions during measurement of intrinsic uncertainty ............. 21

5.5.2 Reference conditions during measurement of influence quantity ................ 21

5.6 Testing procedures ................................................................................................ 21

5.6.1 Intrinsic uncertainty ................................................................................... 21

5.6.2 Repeatability ............................................................................................. 22

5.6.3 Output fluctuation ...................................................................................... 22

5.6.4 Drift ........................................................................................................... 23

5.6.5 Delay time, rise time and fall time .............................................................. 24

5.6.6 Warm-up time ............................................................................................ 24

5.6.7 Procedure for determining interference uncertainty .................................... 24

5.6.8 Variations .................................................................................................. 25

Annex A (informative) Recommended standard values of influence – Quantities

affecting performance from IEC 60359 .................................................................................. 26

Annex B (informative) Performance characteristics calculable from drift tests ...................... 32

Annex C (informative) Physico-chemical data of oxygen in water ......................................... 33

Bibliography .......................................................................................................................... 41

---------------------- Page: 8 ----------------------
SIST EN 62703:2013
62703  IEC:2013 – 3 –

Figure 1 – Output fluctuations ............................................................................................... 23

Table 1 – Time intervals for statement of stability limits ........................................................ 23

Table A.1 – Mains supply voltage ......................................................................................... 30

Table A.2 – Mains supply frequency...................................................................................... 30

Table A.3 – Ripple of d.c. supply .......................................................................................... 31

Table B.1 – Data: applied concentration 1 000 units ............................................................. 32

Table C.1 – Correlation conductivity-salinity ......................................................................... 33

Table C.2 – Elevation barometric pressure (example) ........................................................... 34

Table C.3 – Solubility of oxygen in water exposed to water-saturated air at atmospheric

pressure (1 013 hPa) (Salinity see Table C.1) ....................................................................... 35

Table C.4 – Solubility of oxygen in water vs. temperature and barometric pressure

(lower range) ........................................................................................................................ 37

Table C.5 – Solubility of oxygen in water vs. temperature and barometric pressure

(upper range) ........................................................................................................................ 38

Table C.6 – Pressure conversions ........................................................................................ 39

---------------------- Page: 9 ----------------------
SIST EN 62703:2013
– 4 – 62703  IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPRESSION OF PERFORMANCE OF FLUOROMETRIC
OXYGEN ANALYZERS IN LIQUID MEDIA
FOREWORD

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

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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 62703 has been prepared by subcommittee 65B: Measurement

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

and automation.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/867/FDIS 65B/871/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

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

---------------------- Page: 10 ----------------------
SIST EN 62703:2013
62703  IEC:2013 – 5 –

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

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 11 ----------------------
SIST EN 62703:2013
– 6 – 62703  IEC:2013
EXPRESSION OF PERFORMANCE OF FLUOROMETRIC
OXYGEN ANALYZERS IN LIQUID MEDIA
1 Scope

This International Standard is applicable to fluorometric oxygen analyzers used for the

continuous determination of dissolved oxygen partial pressure or concentration. It applies to

fluorometric oxygen analyzers suitable for use in water containing liquids, ultrapure waters,

fresh or potable water, sea water or other aqueous solutions, industrial or municipal waste

water from water bodies (e.g. lakes, rivers, estuaries) as well as for industrial process

streams and process liquids. Whilst in principle fluorometric oxygen-analyzers are applicable

in gaseous phases, the expression of performance in the gas-phase will not be subject of this

standard.

The sensor unit of a fluorometric oxygen analyzer being in contact with the media to be

measured contains a luminophore in a polymer-membrane permeable for oxygen or within

other oxygen permeable materials (or substrates).

This standard specifies the terminology, definitions, requirements for statements by

manufacturers and tests for fluorometric oxygen analyzers.

This standard is in accordance with the general principles set out in IEC 60359 and

IEC 60770 series.

This standard is applicable to analyzers specified for permanent installation installation in any

location (indoors or outdoors) utilizing an on-line measurement technique.
Safety requirements are dealt with in IEC 61010-1.

Standard range of analogue d.c. current signals used in process control systems are dealt

with in IEC 60381-1.

Specifications for values for the testing of influence quantities can be found in IEC 60654

series.

Requirements for documentation to be supplied with instruments are dealt with in IEC 61187.

Requirements for general principles concerning quantities, units and symbols are dealt with in

ISO 80000-1:2009.
The object of IEC 62703 is:

– to specify the general aspects in the terminology and definitions related to the

performance of fluorometric oxygen analyzers used for the continuous determination of

dissolved oxygen partial pressure or concentration in liquid media;

– to unify methods used in making and verifying statements on the functional performance of

such analyzers;

– to specify which tests should be performed in order to determine the functional

performance and how such tests should be carried out;

– to provide basic documents to support the application of standards of quality assurance

within ISO 9001.
---------------------- Page: 12 ----------------------
SIST EN 62703:2013
62703  IEC:2013 – 7 –
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068 (all parts), Environmental testing
IEC 60359:2001, Electrical and electronic measurement equipment – Expression of
performance

IEC 61010-1, Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 1: General requirements
IEC 61187, Electrical and electronic measuring equipment – Documentation
3 Terms, definitions, quantities and units

For the purposes of this document, the following terms, definitions, quantities and units apply.

NOTE Terms and definitions are taken partially from IEC 60359:2001and IEC 61207-1:2010.

3.1 Basic terms and definitions
3.1.1
measurand

quantity subjected to measurement, evaluated in the state assumed by the measured system

during the measurement itself

Note 1 to entry: The value assumed by a quantity subjected to measurement when it is not interacting with the

measuring instrument may be called unperturbed value of the quantity.

Note 2 to entry: The unperturbed value and its associated uncertainty can only be computed through a model of

the measured system and of the measurement interaction with the knowledge of the appropriate metrological

characteristics of the instrument that may be called instrumental load.
3.1.2
result of a measurement

set of values attributed to a measurand, including a value, the corresponding uncertainty and

the unit of measurement

Note 1 to entry: The mid-value of the interval is called the value (see 3.1.3) of the measurand and its half-width

the uncertainty (see 3.1.4).

Note 2 to entry: The measurement is related to the indication (see 3.1.5) given by the instrument and to the

values of correction obtained by calibration.

Note 3 to entry: The interval can be considered as representing the measurand provided that it is compatible with

all other measurements of the same measurand.

Note 4 to entry: The width of the interval, and hence the uncertainty, can only be given with a stated level of

confidence (see 3.1.4, NOTE 1).

[SOURCE: IEC 60050-300:2001, 311-01-01, modified – revision of the definition and the

notes]
3.1.3
measure-value
mid element of the set assigned to represent the measurand
---------------------- Page: 13 ----------------------
SIST EN 62703:2013
– 8 – 62703  IEC:2013

Note 1 to entry: The measure-value is no more representative of the measurand than any other element of the

set. It is singled out merely for the convenience of expressing the set in the format V ± U, where V is the mid

element and U the half-width of the set, rather than by its extremes. The qualifier "measure-" is used when deemed

necessary to avoid confusion with the reading-value or the indicated value.
3.1.4
uncertainty
uncertainty of measurement

parameter, associated with the result of a measurement, that characterizes the dispersion of

the values that could reasonably be attributed to the measurand

Note 1 to entry: The parameter can be, for example, a standard deviation (or a given multiple of it), or a half-width

of an interval having a stated level of confidence.

Note 2 to entry: Uncertainty of measurement comprises, in general, many components. Some of these

components can be evaluated from the statistical distribution of the results of a series of measurements and can be

characterized by experimental standard deviations. The other components, which can also be characterized by

standard deviations, are evaluated from the assumed probability distributions based on experience or other

information.

Note 3 to entry: It is understood that the result of the measurement is the best estimate of the value of the

measurand, and that all components of uncertainty, including those arising from systematic effects, such as

components associated with corrections and reference standards, contribute to the dispersion.

Note 4 to entry: The definition and notes 1 and 2 are from JCGM 100:2008 Clause 2.2.3 The option used in this

standard is to express the uncertainty as the half-width of an interval with the GUM procedures with a coverage

factor of 2. This choice corresponds to the practice now adopted by many national standards laboratories. With the

normal distribution a coverage factor of 2 corresponds to a level of confidence of 95 %. Otherwise statistical

elaborations are necessary to establish the correspondence between the coverage factor and the level of

confidence. As the data for such elaborations are not always available, it is deemed preferable to state the

coverage factor. This interval can be "reasonably" assigned to describe the measurand, in the sense of the GUM

definition, as in most usual cases it ensures compatibility with all other results of measurements of the same

measurand assigned in the same way at a sufficiently high confidence level.

[SOURCE: IEC 60050-300:2001, 311-01-02, modified – deletion of the existing Note 1 and

addition of two new notes]
3.1.5
indication
reading-value
output signal of the instrument

Note 1 to entry: The indicated value can be derived from the indication by means of the calibration curve.

Note 2 to entry: For a material measure, the indication is its nominal or stated value.

Note 3 to entry: The indication depends on the output format of the instrument:

– for analogue outputs it is a number tied to the appropriate unit of the display;

– for digital outputs it is the displayed digitized number;
– for code outputs it is the identification of the code pattern.

Note 4 to entry: For analogue outputs meant to be read by a human observer (as in the index-on-scale

instruments) the unit of output is the unit of scale numbering; for analogue outputs meant to be read by another

instrument (as in calibrated transducers) the unit of output is the unit of measurement of the quantity supporting the

output signal.

[SOURCE: IEC 60050-300:2001, 311-01-01, modified – modification of the definition and

addition of new notes]
3.1.6
calibration

set of operations which establishes the relationship which exists, under specified conditions,

between the indication and the result of a measurement
---------------------- Page: 14 ----------------------
SIST EN 62703:2013
62703  IEC:2013 – 9 –

Note 1 to entry: Calibrations are performed under well-defined operating conditions for the instrument. The

calibration diagram representing its result is not valid if the instrument is operated under conditions outside the

range used for the calibration.

Note 2 to entry: The relationship between the indications and the results of measurement can be expressed, in

principle, by a calibration diagram.
[SOURCE: IEC 60050-300:2001, 311-01-09, modified – modification of Note 1]
3.1.7
calibration diagram

portion of the co-ordinate plane, defined by the axis of indication and the axis of results of

measurement, which represents the response of the instrument to differing values of the

measurand
[SOURCE: IEC 60050-300:2001, 311-01-10, modified – deletion of the note]
3.1.8
calibration curve

curve which gives the relationship between the indication and the value of the measurand

Note 1 to entry: When the calibration curve is a straight line passing through zero, it is convenient to refer to the

slope which is known as the instrument constant.

Note 2 to entry: The calibration curve is the curve bisecting the width of the calibration diagram parallel to the

axis of results of measurement, thus joining the points representing the values of the measurand.

[SOURCE: IEC 60050-300:2001, 311-01-11, modified – deletion of Note 1]
3.1.9
indicated value
value given by an indicating instrument on the basis of its calibration curve

Note 1 to entry: The indicated value is the measure-value of the measurand when the instrument is used in a

direct measurement under all the operating conditions for which the calibration diagram is valid.

[SOURCE: IEC 60050-300:2001, 311-01-08, modified – update of the definition and the note]

3.1.10
conventional value measure

value of a standard used in a calibration operation and known with uncertainty negligible with

respect to the uncertainty of the instrument to be calibrated

Note 1 to entry: This definition is adapted to the object of this standard from the definition of "convention

...

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