EN ISO 4373:2008
(Main)Hydrometry - Water level measuring devices (ISO 4373:2008)
Hydrometry - Water level measuring devices (ISO 4373:2008)
ISO 4373:2008 specifies the functional requirements of instrumentation for measuring the level of water surface (stage), primarily for the purpose of determining flow rates. An informative annex provides guidance on the types of water level measurement devices currently available and the measurement uncertainty associated with them.
Hydrometrie - Geräte zur Wasserstandsmessung (ISO 4373:2008)
Diese Internationale Norm legt die funktionellen Anforderungen an die Messgeräteausrüstung zum Messen des Pegels der Wasseroberfläche (Höhe des Wasserstandes), vor allem zur Bestimmung des Durchflusses, fest. Die vorliegende Internationale Norm wird durch einen Anhang ergänzt, der einen Leitfaden zu gegen-wärtig verfügbaren Messgerätetypen zur Wasserstandsmessung und die damit verbundene Messunsicherheit enthält (siehe Anhang A).
Hydrométrie - Appareils de mesure du niveau de l'eau (ISO 4373:2008)
L'ISO 4373:2008 spécifie les caractéristiques de fonctionnement des instruments employés pour mesurer le niveau de la surface de l'eau, essentiellement afin de déterminer des débits. Elle est complétée par une annexe donnant 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.
Hidrometrija - Naprave za merjenje višine gladine vode (ISO 4373:2008)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2009
Hidrometrija - Naprave za merjenje višine gladine vode (ISO 4373:2008)
Hydrometry - Water level measuring devices (ISO 4373:2008)
Hydrometrie - Geräte zur Wasserstandsmessung (ISO 4373:2008)
Hydrométrie - Appareils de mesure du niveau de l'eau (ISO 4373:2008)
Ta slovenski standard je istoveten z: EN ISO 4373:2008
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.
EUROPEAN STANDARD
EN ISO 4373
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 17.120.20
English Version
Hydrometry - Water level measuring devices (ISO 4373:2008)
Hydrométrie - Appareils de mesure du niveau de l'eau (ISO Hydrometrie - Geräte zur Wasserstandsmessung (ISO
4373:2008) 4373:2008)
This European Standard was approved by CEN on 4 October 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4373:2008: E
worldwide for CEN national Members.
Contents Page
Foreword.3
Foreword
This document (EN ISO 4373:2008) has been prepared by Technical Committee ISO/TC 113 "Hydrometric
determinations" 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 April 2009, and conflicting national standards shall be withdrawn at the
latest by April 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 4373:2008 has been approved by CEN as a EN ISO 4373:2008 without any modification.
INTERNATIONAL ISO
STANDARD 4373
Third edition
2008-10-15
Hydrometry — Water level measuring
devices
Hydrométrie — Appareils de mesure du niveau de l'eau
Reference number
ISO 4373:2008(E)
©
ISO 2008
ISO 4373:2008(E)
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ii © ISO 2008 – All rights reserved
ISO 4373:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Instrument specification . 1
4.1 Performance classifications . 1
4.2 General. 1
4.3 Maximum rate of change. 2
4.4 Environment . 2
4.5 Timing . 3
5 Recording . 3
5.1 Chart recorders . 3
5.2 Data loggers . 3
6 Enclosure. 3
7 Installation . 3
8 Estimation of measurement uncertainty . 4
8.1 General. 4
8.2 Type-A estimation. 4
8.3 Type-B estimation. 4
8.4 Level measurement datum . 4
8.5 Combining primary measurement uncertainties. 4
Annex A (informative) Types of water level measuring devices . 5
A.1 Reference gauges. 5
A.2 Peak level gauges. 9
A.3 Mechanical float and counterweight gauges . 10
A.4 Air reaction gauges . 11
A.5 Electrical pressure transducers . 14
A.6 Echo-location, acoustic instruments. 15
A.7 Echo-location, radar instruments . 16
A.8 Systems using electrical properties . 17
A.9 Recording devices. 18
Bibliography . 20
ISO 4373:2008(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 organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 4373 was prepared by Technical Committee ISO/TC 113, Hydrometry, Subcommittee SC 5, Instruments,
equipment and data management.
This third edition cancels and replaces the second edition (ISO 4373:1995), which has been technically
revised.
iv © ISO 2008 – All rights reserved
INTERNATIONAL STANDARD ISO 4373:2008(E)
Hydrometry — Water level measuring devices
1 Scope
This International Standard specifies the functional requirements of instrumentation for measuring the level of
water surface (stage), primarily for the purpose of determining flow rates. This International Standard is
supplemented by an annex providing guidance on the types of water level measurement devices currently
available and the measurement uncertainty associated with them (see Annex A).
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 772, Hydrometry — Vocabulary and symbols
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60079-10, Electrical apparatus for explosive gas atmospheres — Part 10: Classification of hazardous
areas
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 772 apply.
4 Instrument specification
4.1 Performance classifications
The parameters of performance of a water level measuring device shall be described by the classification
categories of uncertainty, temperature range and relative humidity so that the overall performance of the
equipment may be summarized in three digits.
4.2 General
Water level measuring devices shall be classified in accordance with the performance classes given in
Table 1 that account for the resolution to be achieved and the limits of uncertainty required over specified
ranges.
It should be made clear whether these levels of attainment can only be achieved by the use of special works,
for example installation within stilling wells. It is also important to remember that in the measurement of stage,
uncertainty expressed as a percentage of range gives rise to worst case uncertainty in the determination of
stage at low values of stage. This is highly significant for the measurement of low flows and should be taken
into account in the design of equipment for this purpose.
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