SIST EN 17075:2019+A1:2023

Water quality - General requirements and performance test procedures for water monitoring equipment - Continuous measuring devices

This European Standard specifies general requirements and performance test procedures for portable and fixed position measuring devices (MDs) that are used in an in-line or online operating position to measure physical and chemical determinands in water. It excludes at-line devices, such as chemical test kits, and off-line devices, such as laboratory analysers.
The general requirements include functional facilities that MDs need to meet users’ applications and information that need to be included in associated documents.
The test procedures specify uniform methods to be used when determining key performance characteristics of MDs. The performance tests comprise testing carried out under laboratory and field conditions.
Statistical procedures are defined for evaluation of the test data. It is recognized that for some devices certain test procedures are not applicable.
Example values for performance characteristics for a selection of MDs for monitoring waste water effluents and receiving waters are detailed in Annex A for guidance.
This European Standard requires the manufacturer of a MD to provide more technical data for verification than does EN ISO 15839:2006 [5]. Consequently, EN ISO 15839 will be of greater assistance to manufacturers wishing to characterize a new device whereas this European Standard is more focussed on user requirements for the verification of manufacturer’s claims.

Wasserbeschaffenheit - Allgemeine Anforderungen und Testverfahren zur Leistungsprüfung von Geräten zum Wassermonitoring - Kontinuierliche Messgeräte

Dieses Dokument legt allgemeine Anforderungen und Leistungsprüfungsverfahren für tragbare und fest installierte Messgeräte fest, die in einer Inline  oder Online Betriebsposition verwendet werden, um physikalische und chemische Bestimmungsgrößen in Wasser zu messen. Es deckt keine chemischen Test-Kits und Laboranalysegeräte ab.
Die allgemeinen Anforderungen umfassen bestimmte Merkmale, die für den Gebrauch des Geräts, zur Information des Anwenders und für die zugehörigen Dokumente notwendig sind.
Die Prüfverfahren legen einheitliche Verfahren fest, die beim Bestimmen von wichtigen Leistungskenngrößen von MDs verwendet werden. Die Leistungsprüfungen umfassen unter Labor- und Feldbedingungen durchgeführte Prüfungen. Es ist zu beachten, dass bestimmte Prüfverfahren für einige Geräte nicht geeignet sind.
Statistische Verfahren für die Auswertung der Prüfdaten sind definiert.
Beispielwerte für Leistungskenngrößen für eine Auswahl an MDs zum Monitoring von Abläufen von Abwasser und Vorflutern sind detailliert in Anhang A als Hilfestellung angegeben.
Dieses Dokument fordert von den Herstellern eines MD die Bereitstellung von mehr technischen Daten zur Verifizierung als EN ISO 15839:2006 [7]. Deshalb ist EN ISO 15839 [7] eine bessere Hilfestellung für Hersteller, die ein neues Gerät charakterisieren möchten, während dieses Dokument den Schwerpunkt eher auf die Anwenderanforderungen für die Verifizierung der Herstellerangaben legt.

Qualité de l'eau - Exigences générales et modes opératoires d'essai de performance pour les équipements de surveillance de l'eau - Dispositifs de mesure en continu

Le présent document spécifie les exigences générales et les modes opératoires d'essai de performance
pour les dispositifs de mesure en continu portables et fixes qui sont utilisés in situ, en ligne ou en
ligne avec boucle de prélèvement afin de quantifier les mesurandes physiques et chimiques dans l'eau. Il
exclut les essais chimiques en kit et les analyseurs de laboratoire.
Les exigences générales comprennent les installations fonctionnelles dont les DMC ont besoin
pour répondre aux besoins des utilisateurs pour leurs applications, ainsi que les informations qui doivent
être incluses dans les documents associés.
Les modes opératoires d'essai spécifient les méthodes uniformes à utiliser pour déterminer les
caractéristiques de performance clés des DMC. Les essais de performance comprennent des essais
effectués dans des conditions de laboratoire et des conditions réelles. Il est reconnu que pour certains
dispositifs, certains modes opératoires d'essai ne sont pas applicables.
Des procédures statistiques sont définies pour l'évaluation des données d'essai.
Des exemples de valeurs de caractéristiques de performance pour une sélection de DMC destinés
à la surveillance des effluents d'eaux usées et des eaux réceptrices sont fournis à l'Annexe A à titre
d'information.
Le présent document exige que le fabricant d'un DMC fournisse davantage de données techniques
pour la vérification que ne l'exige l'EN ISO 15839:2006 [7]. Par conséquent, l'EN ISO 15839 [7] sera d'une
plus grande utilité pour les fabricants qui souhaitent caractériser un nouveau dispositif, tandis que le
présent document est davantage axé sur les exigences de l'utilisateur relatives à la vérification des
allégations du fabricant.

Kakovost vode - Splošne zahteve in postopki preskušanja zmogljivosti opreme za monitoring vode - Merilniki za kontinuirano merjenje (vključuje dopolnilo A1)

General Information

• Status: Published
• Publication Date: 11-May-2023
• ICS: 13.060.45 - Examination of water in general
• Technical Committee: KAV - Water quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-May-2023
• Due Date: 16-Jul-2023
• Completion Date: 12-May-2023
• Ref Project: EN 17075:2018+A1:2023 - Water quality - General requirements and performance test procedures for water monitoring equipment - Continuous measuring devices

Relations

• Consolidates: SIST EN 17075:2019/kFprA1:2022 - Water quality - General requirements and performance test procedures for water monitoring equipment - Continuous measuring devices
• Effective Date: 01-Jun-2023
• Replaces: SIST EN 17075:2019 - Water quality - General requirements and performance test procedures for water monitoring equipment - Measuring devices
• Effective Date: 01-Jun-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 17075:2019+A1:2023
01-junij-2023
Nadomešča:
SIST EN 17075:2019
Kakovost vode - Splošne zahteve in postopki preskušanja zmogljivosti opreme za
monitoring vode - Merilniki za kontinuirano merjenje (vključuje dopolnilo A1)
Water quality - General requirements and performance test procedures for water
monitoring equipment - Continuous measuring devices
Wasserbeschaffenheit - Allgemeine Anforderungen und Testverfahren zur
Leistungsprüfung von Geräten zum Wassermonitoring - Kontinuierliche Messgeräte

Qualité de l'eau - Exigences générales et modes opératoires d'essai de performance

pour les équipements de surveillance de l'eau - Dispositifs de mesure en continu
Ta slovenski standard je istoveten z: EN 17075:2018+A1:2023
ICS:
13.060.45 Preiskava vode na splošno Examination of water in
general
SIST EN 17075:2019+A1:2023 en,fr,de

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

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SIST EN 17075:2019+A1:2023
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SIST EN 17075:2019+A1:2023
EN 17075:2018+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2023
EUROPÄISCHE NORM
ICS 13.060.45 Supersedes EN 17075:2018
English Version
Water quality - General requirements and performance
test procedures for water monitoring equipment -
Measuring devices

Qualité de l'eau - Exigences générales et modes Wasserbeschaffenheit - Allgemeine Anforderungen und

opératoires d'essai de performance pour les Testverfahren zur Leistungsprüfung von Geräten zum

équipements de surveillance de l'eau - Dispositifs de Wassermonitoring - Messgeräte

mesure en continu

This European Standard was approved by CEN on 18 June 2018 and includes Amendment 1 approved by CEN on 20 February

2023.

CEN 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 CEN

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 CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17075:2018+A1:2023 E

worldwide for CEN national Members.
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EN 17075:2018+A1:2023 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

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

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 Symbols ............................................................................................................................................................ 12

5 Principles ........................................................................................................................................................ 12

6 General requirements ................................................................................................................................ 13

6.1 Requirements for !CMDs" ................................................................................................................ 13

6.2 Requirements for !CMDs" associated documents ................................................................... 14

7 Performance characteristics .................................................................................................................... 15

7.1 Performance characteristics determined by laboratory testing ................................................ 15

7.2 Performance characteristics determined by field testing ............................................................. 16

8 Performance testing .................................................................................................................................... 17

8.1 Quality requirements for testing ............................................................................................................ 17

8.2 General requirements for testing ........................................................................................................... 18

8.3 Test conditions .............................................................................................................................................. 19

8.4 Reporting ........................................................................................................................................................ 20

9 Laboratory test procedures ...................................................................................................................... 20

9.1 Guidance for establishing a test plan .................................................................................................... 20

9.2 Verification by inspection ......................................................................................................................... 21

9.3 Performance tests ........................................................................................................................................ 22

9.3.1 Response time ............................................................................................................................................... 22

9.3.2 Bias, linearity, repeatability and LOQ ................................................................................................... 25

9.3.3 Interference effects ..................................................................................................................................... 25

9.3.4 Ambient temperature and relative humidity .................................................................................... 29

9.3.5 Sample temperature ................................................................................................................................... 30

9.3.6 Sample flow-rate .......................................................................................................................................... 31

9.3.7 Sample pressure ........................................................................................................................................... 31

9.3.8 Output impedance ....................................................................................................................................... 31

9.3.9 Supply voltage ............................................................................................................................................... 32

9.3.10 7-day drift ....................................................................................................................................................... 33

9.3.11 Loss of power ................................................................................................................................................. 33

9.3.12 Warm-up drift................................................................................................................................................ 34

10 Field test procedures .................................................................................................................................. 34

10.1 Objective of field test .................................................................................................................................. 34

10.2 Planning for the field test .......................................................................................................................... 35

10.3 Error under field test conditions ............................................................................................................ 37

10.4 Response time ............................................................................................................................................... 37

10.5 Variation in sensitivity ............................................................................................................................... 38

10.6 Maintenance ................................................................................................................................................... 39

10.7 Up-time ............................................................................................................................................................ 39

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Annex A (informative) Example values for performance characteristics for a selection

of !CMDs" for monitoring waste water effluents and receiving waters .......................... 41

Annex B (normative) Evaluation of performance test data ........................................................................ 46

B.1 Introduction ................................................................................................................................................... 46

B.2 Bias..................................................................................................................................................................... 46

B.3 Repeatability .................................................................................................................................................. 47

B.4 Linearity ........................................................................................................................................................... 47

B.5 Estimation of LOQ ......................................................................................................................................... 48

B.6 7 Day drift (test 9.3.10) .............................................................................................................................. 48

B.7 Effect of influence conditions (tests 9.3.3.2 to 9.3.9.4) ................................................................... 48

B.8 Combined performance characteristic measurement uncertainty ............................................ 50

Annex C (informative) Example calculations ................................................................................................... 52

C.1 General ............................................................................................................................................................. 52

C.2 Worked example – Laboratory tests ...................................................................................................... 52

C.2.1 Bias, repeatability, linearity and LOQ ................................................................................................... 52

C.2.2 Influence conditions .................................................................................................................................... 56

C.2.3 Calculation of combined performance characteristic measurement uncertainty ................ 58

C.3 Worked example — Field tests ................................................................................................................ 59

Annex D (informative) Uncertainty of the reference quantity and error calculations .................... 61

Annex E (informative) Example test report ..................................................................................................... 63

Bibliography ................................................................................................................................................................. 67

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SIST EN 17075:2019+A1:2023
EN 17075:2018+A1:2023 (E)
European foreword

This document (EN 17075:2018+A1:2023) has been prepared by Technical Committee CEN/TC 230

“Water analysis”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2023, and conflicting national standards shall

be withdrawn at the latest by October 2023.

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

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

This document includes Amendment 1 approved by CEN on 20 February 2023.
This document supersedes EN 17075:2018.

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the

United Kingdom.
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EN 17075:2018+A1:2023 (E)
Introduction

This document defines general requirements and test procedures for verifying the performance of

!continuous measuring devices (CMDs)" used to monitor the quality of a wide range of waters

including drinking waters, waste waters, and natural waters. It covers both portable !continuous

measuring devices (PCMDs)" and fixed position !continuous measuring devices (FCMDs)".

These devices include: sensors, single and multi-parameter instruments, discrete and batch

instruments, probes and sondes. It excludes chemical test kits. For the purposes of this document the

acronym !CMD(s)" is used except where it is necessary to be specific about the particular type (e.g.

!PCMDs, FCMDs") or component of a !CMD" (e.g. sensor).

This document is associated with EN 16479 [1] which covers automated sampling devices (samplers)

for water and waste water.

The general requirements include several features that are necessary to meet users’ applications and

information that has to be included in associated documents.

The performance tests comprise testing carried out under laboratory and field conditions They are

designed to determine, in a systematic and consistent way, the capability of !CMDs" to make

reliable measurements. The testing focuses on key performance characteristics. Statistical procedures

are defined for evaluation of the test data.

The range of measurements over which the test procedures will be applied, the test range, is not

specified. It is for the ! CMD" manufacturer and/or the user to decide on the test range. Similarly, it

is for the ! CMD" manufacturer and/or the user to decide on the intended uses (applications)

which will inform the design of the field trial.

Water monitoring equipment is widely used for compliance monitoring purposes under national and

European regulations. This document supports the requirements of the following EU Directives:

— Industrial Emissions Directive (2010/75/EU) [2];
— Water Framework Directive (2000/60/EC) [3];
— Marine Strategy Framework Directive (2008/56/EC) [4];
— Drinking Water Directive (98/83/EC) [5];

— Technical Specifications for Chemical Analysis and Monitoring of Water Status (2009/90/EC) [6].

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EN 17075:2018+A1:2023 (E)
1 Scope

This document specifies general requirements and performance test procedures for portable and fixed

position !continuous measuring devices" that are used in an in-line or online operating position to

measure physical and chemical measurands in water. It excludes chemical test kits and laboratory

analysers.

The general requirements include functional facilities that !CMDs" need to meet users’

applications and information that needs to be included in associated documents.

The test procedures specify uniform methods to be used when determining key performance

characteristics of !CMDs". The performance tests comprise testing carried out under laboratory

and field conditions. It is recognized that for some devices certain test procedures are not applicable.

Statistical procedures are defined for evaluation of the test data.

Example values for performance characteristics for a selection of !CMDs" for monitoring waste

water effluents and receiving waters are detailed in Annex A for guidance.

This document requires the manufacturer of a !CMD" to provide more technical data for

verification than does EN ISO 15839:2006 [7]. Consequently, EN ISO 15839 [7] will be of greater

assistance to manufacturers wishing to characterize a new device whereas this document is more

focussed on user requirements for the verification of manufacturer’s claims.
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.

EN ISO 5814:2012, Water quality - Determination of dissolved oxygen - Electrochemical probe method

(ISO 5814:2012)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
continuous measuring device
CMD

component or a group of components, used in an in-line or on-line operating position, which

continuously (or at a given frequency) gives an output signal proportional to the value of one or more

measurands in waters which it measures
Note 1 to entry: The device can be portable or fixed in position.
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3.2
portable !continuous measuring device
PCMD

continuous measuring device" that can be moved from one measuring point to another and used in

an in-line or on-line operating position
3.3
fixed !continuous measuring device
FCMD

continuous measuring device" that can be fixed in position and used in an in-line or on-line operating

position
3.4
sensor

electronic device that senses a physical condition or chemical compound and delivers an electronic

signal proportional to the observed characteristic
[SOURCE: ISO/IEC 19762:2016 [8], 06.02.08]
3.5
in-line measuring device
in situ measuring device

system of automatic measurement in which at least the sensor is sited in the body of water

[SOURCE: ISO 6107-2:2006[9], 54, modified — term “analysis” replaced by term “measuring device”

and within definition “analysis” replaced by “measurement”]
3.6
on-line measuring device

system of automatic measurement in which the sample is taken from the body of water through a probe

to the measuring device by means of an appropriate conduit
Note 1 to entry: Sometimes referred to as an extractive measuring device.

[SOURCE: ISO 6107-2:2006+A1:2012 [10], 71, modified — term “analysis” replaced by term “measuring

device”, within definition “analysing equipment” replaced by “measuring device” and Note 1 to entry

added]
3.7
percentage error
error in measurement expressed as a percentage of the reference value
3.8
measurement bias
bias
estimate of a systematic measurement error
[SOURCE: ISO/IEC Guide 99:2007 [11], 2.18]
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3.9
measurement repeatability
repeatability
precision under a set of repeatability conditions of measurement
[SOURCE: ISO/IEC Guide 99 [11], 2.21]

Note 1 to entry: In this standard the ability of a !CMD" to provide closely similar indications for repeated

measurements of the same measurand under the same conditions of measurement.
3.10
limit of quantification
LOQ

stated multiple of the limit of detection, for example two or three times the limit of detection, at a

concentration of the measurand that can reasonably be determined with an acceptable level of accuracy

and precision

Note 1 to entry: Limit of quantification can be calculated using an appropriate standard or sample, and may be

obtained from the lowest calibration point on the calibration curve (excluding the blank). See ISO 6879 [12].

[SOURCE: ISO 6107-2:2006+A1:2012 [10], 61]
3.11
linearity

degree to which there is a straight-line relationship between the (mean) result of measurement (signal)

and the quantity (concentration) of the component to be determined
[SOURCE: EN ISO 11885:2009 [13], 3.9, modified]
3.12
drift
slow change of output, at a constant input, of a measuring system
[SOURCE: EN ISO 15796:2005 [14], 2.8]
3.13
response time (t )

time interval between the instant when a continuous measuring device is subjected to an abrupt change

in measurand value and the instant when the readings cross the limits of (and remain inside) a band

defined by the 90 % and the 110 % of the difference between the initial and final value of the abrupt

change
[SOURCE: EN ISO 15839:2006 [7], 3.3, modified]
3.14
performance characteristics
set of parameters describing the performance of a !CMD"
[SOURCE: EN ISO 15839:2006 [7], 3.27, modified]
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3.15
measurement error
error of measurement
error
measured quantity value minus a reference quantity value
Note 1 to entry: The concept of “measurement error” can be used both:

a) when there is a single reference quantity value to refer to, which occurs if a calibration is made by

means of a measurement standard with a measured quantity value having a negligible measurement

uncertainty or if conventional quantity value is given, in which case the measurement error is known;

and

b) if a measurand is supposed to be represented by a unique true quantity value or a set of true quantity

values of negligible range, in which case the measurement error is not known.

Note 2 to entry: Measurement error should not be confused with production error or mistake.

[SOURCE: ISO/IEC Guide 99:2007 [11], 2.16]
3.16
measurement uncertainty
uncertainty of measurement
uncertainty

non-negative parameter characterizing the dispersion of the quantity values being attributed to a

measurand, based on the information used

Note 1 to entry: The parameter may be, for example, a standard deviation called standard measurement

uncertainty (or a specified multiple of it), or the half-width of an interval, having a stated coverage probability.

Note 2 to entry: In general, for a given set of information, it is understood that the measurement uncertainty is

associated with a stated quantity value attributed to the measurand. A modification of this value results in a

modification of the associated uncertainty.

Note 3 to entry: Measurement uncertainty includes components arising from systematic effects, such as

components associated with corrections and the assigned quantity values of measurement standards, as well as

the definitional uncertainty. Sometimes estimated systematic effects are not corrected for but, instead, associated

measurement uncertainty components are incorporated.

Note 4 to entry: Measurement uncertainty comprises, in general, many components. Some of these may be

evaluated by Type A evaluation of measurement uncertainty from the statistical distribution of the quantity values

from series of measurements and can be characterized by standard deviations. The other components, which may

be evaluated by Type B evaluation of measurement uncertainty, can also be characterized by standard deviations,

evaluated from probability density functions based on experience or other information.

[SOURCE: ISO/IEC Guide 99:2007 [11], 2.26]
3.17
standard measurement uncertainty
standard uncertainty of measurement
standard uncertainty
measurement uncertainty expressed as a standard deviation
[SOURCE: ISO/IEC Guide 99:2007 [11], 2.30]
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3.18
combined standard measurement uncertainty
combined standard uncertainty

standard measurement uncertainty that is obtained using the individual standard measurement

uncertainties associated with the input quantities in a measurement model

Note 1 to entry: In case of correlations of input quantities in a measurement model, covariances must also be

taken into account when calculating the combined standard measurement uncertainty, see also

ISO/IEC Guide 98-3:2008 [15], 2.3.4.
[SOURCE: ISO/IEC Guide 99:2007 [11], 2.31]
3.19
expanded measurement uncertainty
expanded uncertainty

product of a combined standard measurement uncertainty and a factor larger than the number one

Note 1 to entry: Expanded measurement uncertainty is termed “overall uncertainty” in paragraph 5 of

Recommendation INC-1 (1980) (see the GUM) and simply “uncertainty” in IEC documents.

Note 2 to entry: The factor depends upon the type of probability distribution of the output quantity in a

measurement model and on the selected coverage probability.

Note 3 to entry: The term “factor” in this definition refers to a coverage factor.

[SOURCE: ISO/IEC Guide 99:2007 [11], 2.35]
3.20
combined performance characteristic

combination of individual performance characteristics expressed as an expanded measurement

uncertainty (with a coverage factor of 2)
3.21
test range
measuring range over which the !CMD" is tested
3.22
output

reading, or a digital, analogue, wired or wireless electrical signal, generated by a !CMD" in

response to a measurand
3.23
rated operating condition

operating condition that must be fulfilled during measurement in order that a measuring instrument or

measuring system perform as designed

Note 1 to entry: Rated operating conditions generally specify intervals of values for a quantity being measured

and for any influence quantity.
[SOURCE: ISO/IEC Guide 99:2007 [11], 4.9]
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3.24
interferent

physical, biological or chemical property of the sample, excluding the measurand, that affects the output

signal
[SOURCE: EN ISO 15839:2006 [7], 3.16, modified]
3.25
adjustment of a measuring system
adjustment

set of operations carried out on a measuring system so that it provides prescribed indications

corresponding to given values of a quantity to be measured

Note 1 to entry: Types of adjustment of a measuring system include zero adjustment of a measuring system,

offset adjustment, and span adjustment (sometimes called gain adjustment).

Note 2 to entry: After an adjustment of a measuring system, the measuring system usually needs to be

recalibrated.

Note 3 to entry: Adjustment of a measuring system should not be confused with calibration, which is a

prerequisite for adjustment.
[SOURCE: ISO/IEC Guide 99:2007 [11], 3.11]
3.26
reference method

method to be used to obtain the measurand value of the test waters, against which the readings from

the !CMD" under test can be compared
3.27
measurand
quantity intended to be measured
[SOURCE: ISO/IEC Guide 99:2007 [11], 2.3, modified]
3.28
reference operating condition

operating condition prescribed for evaluating the performance of a measuring instrument or measuring

system or for comparison of measurement results
[SOURCE: ISO/IEC Guide 99:2007 [11], 4.11]
3.29
flow cell

housing within which a sensor can be held and through which the test water can be directed

3.30
up-time

fraction of the total time for which usable measuring data are available from the !CMD"

3.31
warm-up period
interval between switching on power to the measurement circuit and the i
...