kSIST FprEN 18069:2025
(Main)Water quality - Minimum requirements for the selection, installation, validation, and operation of continuous measuring devices
Water quality - Minimum requirements for the selection, installation, validation, and operation of continuous measuring devices
This document specifies requirements for the selection, installation, qualification, and operation of continuous measuring devices (CMDs). The overall objective is to obtain representative and reliable measurements when using CMDs to monitor water quality.
This document applies to continuous measuring devices for monitoring physical and chemical parameters in different types of water.
Richtlinien für die Installation und betriebliche Implementierung von kontinuierlichen Messsystemen
Dieses Dokument legt Anforderungen an die Auswahl, Installation, Validierung und den Betrieb von kontinuierlichen Messgeräten (CMDs, en: continuous measuring devices) wie folgt fest:
1) Auswahl: Festlegen der Anwenderanforderungen, der Zwecke der erforderlichen Messungen und der damit verbundenen Anforderungen an die Datenqualität sowie Auswahl der CMDs;
2) Installation: Überprüfen der vollständigen und richtigen Lieferung des angeschafften CMD und Verifizieren der korrekten Funktionsweise der Vor-Ort-Installation, des Betriebs und der Kommunikation mit dem CMD;
3) Validierung: Überprüfen, dass das korrekt installierte CMD alle ursprünglich festgelegten Anforderungen erfüllt;
4) Betrieb: Implementierung von Betriebs- und Wartungsverfahren, Datenverarbeitung und Dokumentenrückverfolgbarkeit.
Das übergeordnete Ziel ist, repräsentative und zuverlässige Messwerte bei der Verwendung von CMDs für die Überwachung der Wasserbeschaffenheit zu erhalten.
Dieses Dokument gilt für kontinuierliche Messgeräte (CMD) zur Überwachung physikalischer und chemischer Parameter in unterschiedlichen Arten von Wasser.
Qualité de l'eau - Exigences minimales pour l'installation, la mise en service, la maintenance et la mise en œuvre opérationnelle de dispositifs de mesure en continu
Le présent document spécifie les exigences relatives au choix, à l'installation, à la qualification, et à l'exploitation des dispositifs de mesure en continu (DMC). L'objectif global est d'obtenir des mesures représentatives et fiables lors de l'utilisation de DMC pour surveiller la qualité de l'eau.
Le présent document s'applique aux dispositifs de mesure en continu destinés à la surveillance de paramètres physiques et chimiques dans différents types d'eau.
Kakovost vode - Minimalne zahteve za izbiro, namestitev, validacijo in delovanje merilnikov za kontinuirano merjenje
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 18069:2025
01-marec-2025
Kakovost vode - Minimalne zahteve za izbiro, namestitev, validacijo in delovanje
merilnikov za kontinuirano merjenje
Water quality - Minimum requirements for the selection, installation, validation, and
operation of continuous measuring devices
Richtlinien für die Installation und betriebliche Implementierung von kontinuierlichen
Messsystemen
Qualité de l'eau - Exigences minimales pour l'installation, la mise en service, la
maintenance et la mise en œuvre opérationnelle de dispositifs de mesure en continu
Ta slovenski standard je istoveten z: prEN 18069
ICS:
13.060.45 Preiskava vode na splošno Examination of water in
general
oSIST prEN 18069:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 18069:2025
oSIST prEN 18069:2025
DRAFT
EUROPEAN STANDARD
prEN 18069
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2025
ICS 13.060.45
English Version
Water quality - Minimum requirements for the selection,
installation, validation, and operation of continuous
measuring devices
Qualité de l'eau - Exigences minimales pour le choix, Wasserbeschaffenheit - Mindestanforderungen für die
l'installation, la validation et l'exploitation de Auswahl, Installation, Validierung und den Betrieb von
dispositifs de mesure en continu kontinuierlichen Messgeräten
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 230.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18069:2025 E
worldwide for CEN national Members.
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prEN 18069:2024 (E)
Contents Page
Introduction . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Selection, installation, validation and operation of continuous measuring devices . 8
4.1 General. 8
4.2 Selection . 9
4.3 Installation and verification . 13
4.4 Validation . 14
4.5 Operation . 14
Annex A (informative) Examples of quality and/or performance requirements for water
monitoring . 20
Annex B (informative) Questionnaire relative to the characteristics of a measuring point for
water monitoring - example . 21
Annex C (informative) Example of calibration criteria, verification procedure and
measurement standards for continuous measuring stations for surface water quality
monitoring . 23
C.1 Calibration criteria . 23
C.2 Calibration verification procedure . 23
C.3 Measurement standards for calibration and/or adjustment . 25
Annex D (informative) Method of correcting drifts and examples of data post-processing . 28
D.1 Method of correcting drifts based on USGS (2006) . 28
D.2 Examples of data post-processing . 29
D.3 Data confidence index . 31
Bibliography . 32
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Introduction
The continuous monitoring of water quality parameters can provide real time information on temporal
variability compared with sampling campaigns conducted at fixed intervals which can miss significant
events such as a concentration peak during a flood or rainfall episode.
Moreover, in the event of pollution due to industrial accidents or transport on inland waterways for
example, it is vital to be able to detect these events as early as possible and react rapidly to limit their
impacts on the environment and possible drinking water resource.
Consequently, the choice of having recourse to continuous measuring devices (CMDs) is directly linked
to the advantages of obtaining a rapid measurement (a few seconds to a few minutes) at short time
intervals (from a few seconds to a few hours) and in most cases in real time. Furthermore, it is possible
to use the resulting measurements to automatically trigger actions, such as taking a sample for further
analysis and/or stopping pumping of a drinking water resource.
In order to obtain representative and reliable measurements when using CMDs to monitor water quality,
this document specifies minimum requirements for the following four steps:
1) Selection: defining the user requirements, the purposes of the required measurements, associated
data quality requirements, and choice of CMDs.
2) Installation: verifying a complete and correct delivery of the procured CMD and verifying a correctly
functioning on-site installation, operation and communication of the CMD.
3) Validation: verifying that the correctly installed CMD meets all of the original defined requirements.
4) Operation: implementing operating and maintenance procedures, processing of data and document
traceability.
This document is associated with EN 17075 which 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.
Continuous measuring devices are widely used for compliance monitoring purposes under national and
European regulations.
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1 Scope
This document specifies requirements for the selection, installation, qualification, and operation of
continuous measuring devices (CMDs). The overall objective is to obtain representative and reliable
measurements when using CMDs to monitor water quality.
This document applies to continuous measuring devices for monitoring physical and chemical
parameters in different types of water.
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 17075:2018+A1:2023, Water quality - General requirements and performance test procedures for
water monitoring equipment - Continuous measuring devices
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:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
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.
[SOURCE: EN 17075]
3.2
sensor
electronic device that senses a physical condition or chemical compound and delivers an electronic signal
proportional to the observed characteristic
[SOURCE: EN 17075]
3.3
in-line continuous measuring device
in-situ continuous measuring device
system of automatic measurement which at least the sensor is sited in the body of water
[SOURCE: EN 17075]
3.4
on-line continuous measuring device
system of automatic measurement in which the sample is taken from the body of water by means of an
appropriate conduit to the CMD
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Note 1 to entry: Sometimes referred to as an extractive continuous measuring device.
[SOURCE: Adapted from EN 17075]
3.5
measuring point
geographical location of the site at which the measurement is taken
3.6
outlier
member of a set of values which is inconsistent with the other members of that set
[SOURCE: ISO 5725-1]
3.7
reference method
method, material or device to be used to obtain the measurand value of the test waters, against which the
readings from the CMD used can be compared
[SOURCE: adaptated from EN 17075]
3.8
calibration
operation that, under specified conditions, in a first step, establishes a relation between the quantity
values with measurement uncertainties provided by measurement standards and corresponding
indications with associated measurement uncertainties and, in a second step, uses this information to
establish a relation for obtaining a measurement result from an indication
Note 1 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram,
calibration curve, or calibration table. In some cases, it may consist of an additive or multiplicative correction of the
indication with associated measurement uncertainty.
Note 2 to entry: Calibration should not be confused with adjustment of a measuring system, often mistakenly called
“self-calibration”, nor with verification of calibration.
[SOURCE: VIM 2012, 2.39]
3.9
adjustment of a measuring system
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: Adjustment of a measuring system should not be confused with calibration, which is a prerequisite
for adjustment.
Note 3 to entry: After an adjustment of a measuring system, the measuring system must usually be recalibrated.
Series of operations performed on a measuring system so that it delivers prescribed indications corresponding to
given values of the quantities to measure
[SOURCE: VIM 2012, 3.11]
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3.10
verification
provision of objective evidence that a given item fulfils specified requirements
Note 1 to entry: When applicable, measurement uncertainty should be taken into consideration.
Note 2 to entry: The item may be, e.g. a process, measurement procedure, material, compound, or measuring
system.
Note 3 to entry: The specified requirements may be, e.g. that a manufacturer's specifications are met.
Note 4 to entry: Verification in legal metrology, as defined in VIML [53], and in conformity assessment in general,
pertains to the examination and marking and/or issuing of a verification certificate for a measuring system.
Note 5 to entry: Verification should not be confused with calibration. Not every verification is a validation.
[SOURCE: VIM 2012, 2.44]
3.11
validation
verification, where the specified requirements are adequate for an intended use
[SOURCE: VIM 2012, 2.45]
3.12
measurement standard
realization of the definition of a given quantity, with stated quantity value and associated measurement
uncertainty, used as a reference verification, where the specified requirements are adequate for an
intended use
[SOURCE: VIM 2012, 5.1]
3.13
primary measurement standard
primary standard
measurement standard established using a primary measuring procedure or created as an object by
convention
[SOURCE: VIM 2012, 5.4]
3.14
secondary measurement standard
secondary standard
measurement standard established through calibration with respect to a primary measurement standard
of a quantity of the same kind
[SOURCE: VIM 2012, 5.5]
3.15
working measurement standard
working standard
measurement standard that is used routinely to calibrate or verify measuring instruments or measuring
systems
[SOURCE: VIM 2012, 5.7]
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3.16
measurement accuracy
accuracy of measurement
accuracy
closeness of agreement between a measured quantity value and a true quantity value of a measurand
Note 1 to entry: The concept ‘measurement accuracy’ is not a quantity and is not given a numerical quantity value.
A measurement is said to be more accurate when it offers a smaller measurement error.
Note 2 to entry: The term “measurement accuracy” should not be used for measurement trueness and the term
“measurement precision” should not be used for ‘measurement accuracy’, which, however, is related to both these
concepts.
Note 3 to entry: ‘Measurement accuracy’ is sometimes understood as closeness of agreement between measured
quantity values that are being attributed to the measurand.
[SOURCE: VIM 2012, 2.13]
3.17
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: 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 2 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 3 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.
Note 4 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.
[SOURCE: VIM 2012, 2.26]
3.18
Laboratory Information Management System
LIMS
software that allows managing samples, test results and associated data e.g. to improve lab productivity
3.19
Supervisory Control and Data Acquisition
SCADA
industrial computer system that monitors and controls a process
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3.20
Computerized Maintenance Management System
CMMS
computer software system that supports maintenance management
3.21
Failure Mode and Effect Analysis
FMEA
systematic and proactive method for evaluating a process to identify where and how it might fail and how
to mitigate the potential failures
Note 1 to entry: It is a common tool in engineering and Excel templates can be downloaded for free from the
internet to follow the systematic approach of this tool.
3.22
calibration drift error
result of an electronic drift in CMD reading from the last time the CMD was calibrated
Note 1 to entry: It is determined by the difference between CMD readings using standard solutions or buffers taken
after the CMD has been cleaned and the true, temperature-compensated, value of the standard solutions or buffers.
3.23
fouling error
error determined by the difference between CMD measurements in the environment before and after
cleaning
Note 1 to entry: Biological fouling, siltation, and scaling are the principal causes of fouling error.
3.24
confidence index
accuracy classifications, based on data values recorded before any data corrections are made and after
the record has been evaluated and data corrections applied
4 Selection, installation, validation and operation of continuous measuring
devices
4.1 General
In order to obtain representative and reliable measurements when using CMDs, a procedure shall be
followed to address the minimum requirements specified for the four main steps listed below:
1) Selection: defining the user requirements, the purposes of the required measurements, associated
data quality requirements, and choice of CMDs.
2) Installation: verifying a complete and correct delivery of the procured CMD and verifying a correctly
functioning on-site installation, operation and communication of the CMD.
3) Validation: verifying that the correctly installed CMD meets all of the original defined requirements.
4) Operation: implementation of operating and maintenance procedures, processing of data and
document traceability.
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4.2 Selection
4.2.1 Scope of the user requirements (UR) document
The objectives of the measurement shall be defined and documented in detail before selecting and
installing a continuous measuring device. The objectives should furthermore be expressed as quantifiable
requirements (some examples are given in Annex A).
The following considerations should be addressed:
— general purpose;
— targeted parameter(s);
— targeted application and water characteristics to be measured:
— water composition,
— temperature variation,
— presence of potential interfering factors (e.g. suspended matter, organic matter),
— water pressure and temperature in pipe works,
— expected performances;
— type of installation (in-line and/or online, monitoring station);
— maximum measurement frequency;
— duration of operation;
— reagent consumption depending on measurement frequency;
— range of concentration of the parameters to be measured (based on monitoring records);
— any sample pre-treatment requirements (if necessary).
4.2.2 Normative references and regulatory requirements
Standards (national, international) relevant to method, quality assurance, verification, validation and
data communication shall be identified.
Regulations (national or international) relevant to the application and final use of the monitoring data
shall be identified.
4.2.3 Measuring point
The selection of the measuring point at which to install and deploy a continuous measuring device shall
meet the measurement objectives and comply with the associated quality and safety requirements.
The following considerations should be addressed when selecting a measuring point:
— representativeness of water bodies to be measured;
— process and risk assessment requirements when installing a CMD in a plant or facility;
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— vertical stratification (which can result in differing compositions between water layers in the water
body where exchange between the layers is poor;
— variation in the cross-section of water bodies;
— variation in the amplitude of the expected flow (low waters - floods);
— presence of turbulence that could affect the measurements;
— conditions that could favour biological fouling (large quantity of fine sediments, presence of algae,
invertebrates, etc.);
— means to limit fouling (e.g. self cleaning such as mechanical brush, compressed air, ulstrasound,
chemical reagents);
— range of concentration of the parameters to measure (based on monitoring records);
— infrastructure requirements to protect the measuring systems against debris (particularly during
floods) and vandalism.
4.2.4 Installation
The following considerations should be addressed when installing a CMD at a selected measuring point:
— permits and authorisations required for construction and installation;
— process, environmental and safety risks associated with the construction and installation;
— type of configuration (in-line or online);
— power supply requirements;
— waste removal system;
— means of automatically communicating/transmitting, recording and storing data;
— interfaces with external remote systems, (e.g. LIMS, SCADA Systems), computerized Maintenance
Management Systems (CMMS) and control system;
— installation costs.
4.2.5 Environmental
The following considerations should be addressed:
— hydraulic regime (water in turbulent or laminar regime, high and low water levels, etc;
— ambient temperature and humidity conditions;
— availability of power supply;
— confined and/or hazardous environment;
NOTE Attention is drawn to national, European and international rules and legislation governing the safety of
products.
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— logistic aspects;
— accessibility and space;
— sufficient and protected space to perform maintenance;
— lone worker protection if necessary;
— vibrations.
4.2.6 Supporting functionalities
The following considerations should be addressed:
— management of information (storage, backup, recovery, redundancy, archiving, etc);
— management of documentation (Manuals, technical data, records);
— management of security (authorization, access right, password);
— management of regulatory compliance; (handling of hazardous reagents, meeting radio guidelines);
— management of configuration (change management, software versioning, audit trails);
— management of incidents and deviations (recording of alarms and deviations).
4.2.7 Calibration and/or adjustment
The following considerations should be addressed:
— calibration/adjustment strategy and models;
— calibration resource management;
— standards certification and documentation management;
— detailed calibration scheduling;
— calibration execution;
— calibration data collection;
— calibration tracking;
— calibration performance analysis.
4.2.8 Maintenance operations
The following considerations should be addressed:
— maintenance definition management;
— maintenance resource management;
— detailed maintenance scheduling;
— maintenance execution;
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— maintenance data collection;
— maintenance tracking;
— maintenance performance analysis.
4.2.9 Data analysis
The following considerations should be addressed:
— initial assessment;
— identification and elimination of outliers;
— correction of drifts, if necessary;
— final assessment;
— confidence index of data.
4.2.10 Review process
The following considerations should be addressed:
— review management plan (scope, timing, example);
— the maintenance operations history;
— the calibration / adjustment history;
— the quality controls data obtained using the reference method;
— the data corrections performed;
— the problems encountered and the means used to solve them;
— up-time of the measuring devices.
Annex B includes a questionnaire relative to the characteristics of a measuring point.
4.2.11 Selection procedure
The selection procedure is a document prepared by the user that correlates the user requirement (UR)
with the information gathered by different potential suppliers with the objective to review the selected
CDM and verify how the CMD meets the UR.
The selection procedure itself can be done in a template form as a Requirement Traceability Matrix where
one dimension displays the UR including their tolerances (if applicable) and the other dimension displays
the appropriate specifications of the selected supplier systems and the rating about their correspondence
with the URS. User specific weighting factors can be used to give emphasis to most important
specifications.
A formal risk assessment (e.g. Failure Mode and Effect Analysis (FMEA)) shall assess additional risks that
may occur during the life cycle of a CMD. This assessment may identify the need to include the
procurement of consumables, accessories, service and spare parts. The results of this risk analysis shall
be included in the final selection of the CMD.
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4.3 Installation and verification
Installation is a documented process that verifies that all aspects of facility, utilities and equipment that
affect the CMD’s performance conform to the approved selection document, and that the CMD has been
properly delivered, correctly installed and configured according to the requirements set by the
manufacturer or by an approved installation checklist.
Once the CMD is ordered and has been delivered and then installed, the user and the supplier shall verify
that the technical specifications of the CMD and any associated equipment match the technical
requirements listed in the selection documentation.
Verification of the delivered CMD shall include, as a minimum and where applicable, that the:
— contents match the packing list and are not damaged;
— CMD is installed in its proper location;
— wiring and piping connections with other units or equipment are satisfactory;
— installation of secondary instruments and ancillary equipment is correct;
— appropriate energy or utilities supplies are available;
— environmental and operating conditions are within the UR and manufacturer’s guidelines;
— software has been correctly installed;
— firmware versions and serial numbers have been recorded;
— dates of calibration and validation of the CMD have been recorded;
— all documentation, manuals, calibration certificates and certificates of conformity have been safely
filed.
Following correct installation of the CMD, its performance shall be checked for consistency with the user
requirements within the manufacturer-specified operating ranges. This demonstrates the fitness for use
against UR in general functional tests. It also verifies the correct operation of the measurement system,
its software and its communication according to the user and supplier approved protocol.
These tests often include (but are not limited to) the following:
— functionality of the User Interface;
— functionality of display units and signalling LEDs;
— functionality of pumps;
— functionality of Sensors or the analytical system;
— functionality of Calibration;
— functionality of Data Communication and Alarming;
— calibration;
— enabling data recording and data transmittance.
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4.4 Validation
Validation establishes confidence through appropriate testing that the CMD meets all user requirements
for functionality and safety and that procedures are effective and reproducible in the final installed
environment. It serves to:
— check that the performance of the CMD under real conditions effectively meets the measurement
objectives and that the measuring range is appropriate;
— optimize the maintenance frequency to limit the potential drift of the CMD.
The field tests required in Clause 10 of EN 17075:2018+A1:2023 shall be used as the basis for validation.
These tests are designed to assess the performances of a CMD under real conditions that are
representative of a given application. In addition to general requirements, tests are specified for the
determination of measurement error, response time, and variation in sensitivity. Record keeping of
maintenance and up-time is also required.
Where a CMD that has not undergone evaluation under EN 17075, or the field test site used during an
evaluation under EN 17075 is not representative of the application being considered under this
document, then validation shall require all of the requirements for a field test set out in EN 17075 shall
be carried out in full. (In these circumstances the results of the field tests could be used as part of an
evaluation under EN 17075.)
Where a CMD has undergone evaluation u
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