EN ISO 4373:2022

Hydrometry - Water level measuring devices (ISO 4373:2022)

This document specifies the functional requirements of instrumentation for measuring the level of water surface (stage), primarily for the purpose of determining flow rates.
This document is supplemented by Annex A, which provides guidance on the types of automatic water level measurement devices currently available and the measurement uncertainty associated with them. The manually operated measuring devices are described in Annex B.
This document is applicable to both contact and non-contact methods of measurement. The non-contact methods are not in direct material contact with the water surface but measure the height of the water level with ultrasonic or electromagnetic waves.

Hydrometrie - Geräte zur Wasserstandsmessung (ISO 4373:2022)

Dieses Dokument legt die funktionellen Anforderungen an die Messgeräteausrüstung zum Messen des Pegels der Wasseroberfläche (Höhe des Wasserstandes), vor allem zur Bestimmung des Durchflusses, fest.
Dieses Dokument wird durch Anhang A ergänzt, der einen Leitfaden zu gegenwärtig verfügbaren automatischen Mess¬gerätetypen zur Wasserstandsmessung und die damit verbundene Messunsicherheit enthält. Manuell betätigte Messgeräte sind in Anhang B beschrieben.
Dieses Dokument ist sowohl für kontaktbasierte als auch kontaktlose Messverfahren anwendbar. Die kontaktlosen Verfahren stehen nicht in direktem Materialkontakt mit der Wasseroberfläche, sondern messen die Höhe des Wasserstandes mit Ultraschall oder elektromagnetischen Wellen.

Hydrométrie - Appareils de mesure du niveau de l'eau (ISO 4373:2022)

Le présent document spécifie les caractéristiques de fonctionnement des instruments employés pour mesurer le niveau de la surface de l'eau, essentiellement afin de déterminer des débits.
Le présent document est complété par l'Annexe A qui fournit des indications sur les types d'appareils de mesure du niveau de l'eau actuellement disponibles et sur l'incertitude de mesure qui leur est associée. Les appareils de mesure à fonctionnement manuel sont décrits dans l'Annexe B.
Le présent document s'applique à la fois aux méthodes de mesure avec et sans contact. Les méthodes sans contact concernent des appareils qui ne sont pas en contact direct avec la surface de l'eau, mais mesurent la hauteur du niveau d'eau avec des ondes ultrasoniques ou électromagnétiques.

Hidrometrija - Naprave za merjenje višine gladine vode (ISO 4373:2022)

Ta dokument določa funkcionalne zahteve instrumentov za merjenje višine vodne gladine (nivo), predvsem za namene določanja pretokov. Ta dokument dopolnjuje dodatek A, ki vsebuje smernice za vrste instrumentov za samodejno merjenje višine vodne gladine, ki so trenutno na voljo, in z njimi povezano merilno negotovost. Ročno upravljani merilni instrumenti so opisani v dodatku B. Ta dokument se uporablja za kontaktne in brezkontaktne metode merjenja. Brezkontaktne metode niso v neposrednem stiku z vodno gladino, temveč merijo višino vodne gladine z ultrazvočnimi ali elektromagnetnimi valovi.

General Information

• Status: Published
• Publication Date: 19-Apr-2022
• Withdrawal Date: 30-Oct-2022
• ICS: 17.120.20 - Flow in open channels
• Technical Committee: CEN/TC 318 - Hydrometry
• Drafting Committee: CEN/TC 318 - Hydrometry
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-Apr-2022
• Completion Date: 20-Apr-2022
• Ref Project: SIST EN ISO 4373:2022 - Hydrometry - Water level measuring devices (ISO 4373:2022)

Relations

• Replaces: EN ISO 4373:2008 - Hydrometry - Water level measuring devices (ISO 4373:2008)
• Effective Date: 27-Apr-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN ISO 4373:2009
Hidrometrija - Naprave za merjenje višine gladine vode (ISO 4373:2022)
Hydrometry - Water level measuring devices (ISO 4373:2022)
Hydrometrie - Geräte zur Wasserstandsmessung (ISO 4373:2022)
Hydrométrie - Appareils de mesure du niveau de l'eau (ISO 4373:2022)
Ta slovenski standard je istoveten z: EN ISO 4373:2022
ICS:
17.120.20 Pretok v odprtih kanalih Flow in open channels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4373
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 17.120.20 Supersedes EN ISO 4373:2008
English Version
Hydrometry - Water level measuring devices (ISO
4373:2022)
Hydrométrie - Appareils de mesure du niveau de l'eau Hydrometrie - Geräte zur Wasserstandsmessung (ISO
(ISO 4373:2022) 4373:2022)
This European Standard was approved by CEN on 13 March 2022.

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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4373:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 4373:2022) has been prepared by Technical Committee ISO/TC 113
"Hydrometry" in collaboration with Technical Committee CEN/TC 318 “Hydrometry” the secretariat of
which is held by BSI.
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 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
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 supersedes EN ISO 4373:2008.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. 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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 4373:2022 has been approved by CEN as EN ISO 4373:2022 without any modification.

INTERNATIONAL ISO
STANDARD 4373
Fourth edition
2022-03
Hydrometry — Water level measuring
devices
Hydrométrie — Appareils de mesure du niveau de l'eau
Reference number
ISO 4373:2022(E)
ISO 4373:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 4373:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Instrument specification . 1
4.1 Performance parameters . 1
4.2 Performance classification . 1
4.3 Maximum rate of change . 3
4.4 Environment . 3
4.4.1 General . 3
4.4.2 Temperature . 3
4.4.3 Relative humidity . 3
4.5 Timing . 3
4.5.1 General . 3
4.5.2 Digital . 4
4.5.3 Analogue . 4
5 Recording . 4
5.1 General . 4
5.2 Chart recorders . 4
5.3 Data loggers . . 4
6 Enclosure . 4
7 Installation .5
8 Maintenance . 5
9 Estimation of measurement uncertainty . 5
9.1 General . 5
9.2 Type A uncertainty estimation . 6
9.3 Type B uncertainty estimation . 6
9.4 Uncertainty in case of low water level conditions . 7
9.5 Level measurement datum . 7
9.6 Combining primary measurement uncertainties . 7
Annex A (informative) Types of water level measuring devices . 8
Annex B (informative) Manually operated measuring devices .22
Annex C (informative) Recording devices .25
Bibliography .27
iii
ISO 4373:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 113 Hydrometry, Subcommittee
SC 5, Instruments, equipment and data management, in collaboration with the European Com
...