EN 50724:2023
(Main)Fixed Ultrasonic Gas Leak Detectors (UGLD) - General requirements and test methods
Fixed Ultrasonic Gas Leak Detectors (UGLD) - General requirements and test methods
This document refers to UGLDs (ultrasonic gas leak detectors) that work in a frequency beyond the audible range. This document is applicable to fixed ultrasonic gas leak detection equipment intended to provide an indication, alarm or other output function for the purpose of initiating automatic or manual protective action(s). This document specifies general requirements for design, testing and performance, and describes test methods that apply to UGLD. The following items are considered in this document: - Leak rates to be used to verify the detection range of UGLD, - Test gas to be used (nitrogen or compressed air), - Nozzle shape and size used at all tests leak rate tests, - Gas pressure used at all leak rate tests, - Time duration of each leak rate test, - Test leak nozzle height from solid ground, - Test leak nozzle angling relative to test UGLD, - UGLD angle relative to the leak (field of coverage of the UGLD), - Wind speed and direction, air temperature and humidity at day of test, - Minimum distance to solid structures (walls, etc.) at test site, - Installation height relative to the ground, - Texture of solid ground between leak and UGLD, - Background noise sources, known to interfere with UGLDs, - Specification of detection radius in 3 dimensions, - Operational requirements such as temperature, vibration, etc. This document is also applicable when an equipment manufacturer makes any claims regarding any special features of construction or superior performance that exceed the minimum requirements of this document. This document prescribes that all such claims are verified, and that the test procedures are extended or supplemented, where necessary, to verify the claimed performance. The additional tests are agreed between the manufacturer and test laboratory and identified and described in the test report. This document does not apply to portable gas detectors using ultrasonic measurements nor to gas detectors using non-ultrasonic measurements to detect a gas leak.
Ortsfeste Ultraschall-Gasleckage-Detektoren (UGLD) - Allgemeine Anforderungen und Prüfverfahren
Détecteurs de fuites de gaz à ultrasons (DFGU) fixes - Exigences générales et méthodes d’essai
Le présent document traite des détecteurs de fuites de gaz à ultrasons (DFGU) qui travaillent à une fréquence supérieure à la gamme audible. Le présent document s’applique aux appareils de détection de fuites de gaz par ultrasons fixes destinés à donner une indication, générer une alarme ou remplir une autre fonction de sortie afin de déclencher une ou plusieurs actions de protection automatiques ou manuelles. Le présent document spécifie des exigences générales en matière de conception, d’essai et d’aptitude à la fonction, et décrit des méthodes d’essai applicables aux DFGU. Le présent document examine les éléments suivants: - Les débits de fuite à utiliser pour vérifier la portée de détection d’un DFGU, - Le gaz d’essai à utiliser (azote ou air comprimé), - La forme et la taille des buses utilisées pour tous les essais de débit de fuite, - La pression de gaz utilisée pour tous les essais de débit de fuite, - La durée de chaque essai de débit de fuite, - La hauteur de la buse de fuite d’essai par rapport au sol dur, - L’angle de la buse de fuite d’essai par rapport au DFGU soumis à essai, - L’angle du DFGU par rapport à la fuite (champ de couverture du DFGU), - La vitesse et la direction du vent, la température de l’air et l’humidité le jour de l’essai, - La distance minimale par rapport aux structures pleines (murs, etc.) sur le site d’essai, - La hauteur de montage par rapport au sol, - La texture du sol dur entre la fuite et le DFGU, - Les sources de bruit de fond connues pour interférer avec les DFGU, - La spécification du rayon de détection dans 3 dimensions, - Les exigences de fonctionnement telles que la température, les vibrations, etc. Le présent document s’applique également lorsqu’un fabricant de l’appareil formule des réclamations concernant des caractéristiques de construction particulières ou des performances supérieures aux exigences minimales du présent document. Le présent document prescrit de vérifier ce type de réclamations et d’étendre ou de compléter les modes opératoires d’essai, lorsque cela s’avère nécessaire, afin de contrôler les performances revendiquées. Les essais supplémentaires font l’objet d’un accord entre le fabricant et le laboratoire d’essais, et sont identifiés et décrits dans le rapport d’essai. Le présent document ne s’applique pas aux détecteurs de gaz portables qui recourent à des mesurages ultrasonores ni aux détecteurs de gaz qui recourent à des mesurages non ultrasonores pour détecter une fuite de gaz.
Stacionarni ultrazvočni detektorji uhajanja plina (UGLD) - Splošne zahteve in preskusne metode
Ta dokument bo obravnaval ultrazvočne detektorje uhajanja plina (UGLD).
Ta standard določa splošne zahteve za sestavo, preskušanje in zmogljivost delovanja ter opisuje preskusne metode, ki veljajo za ultrazvočne detektorje uhajanja plina.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2024
Stacionarni ultrazvočni detektorji uhajanja plina (UGLD) - Splošne zahteve in
preskusne metode
Fixed Ultrasonic Gas Leak Detectors (UGLD) - General requirements and test methods
Ortsfeste Ultraschall-Gasleckage-Detektoren (UGLD) - Allgemeine Anforderungen und
Prüfverfahren
Détecteurs ultrasoniques fixes - Règles de performance et méthodes d'essai
Ta slovenski standard je istoveten z: EN 50724:2023
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50724
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2023
ICS 13.320
English Version
Fixed Ultrasonic Gas Leak Detectors (UGLD) - General
requirements and test methods
Détecteurs de fuites de gaz à ultrasons (DFGU) fixes - Ortsfeste Ultraschall-Gasleckage-Detektoren (UGLD) -
Exigences générales et méthodes d'essai Allgemeine Anforderungen und Prüfverfahren
This European Standard was approved by CENELEC on 2023-08-07. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50724:2023 E
Contents Page
European foreword . 4
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Glossary. 7
3.2 Types of equipment . 7
3.3 Sensors . 7
3.4 Signals and alarms . 8
4 General requirements . 9
4.1 Introduction . 9
4.2 Design .10
4.2.1 General .10
4.2.2 Indication methods and devices .10
4.2.3 Alarm signal .11
4.2.4 Fault signals .11
4.2.5 Adjustments .11
4.2.6 Battery-powered equipment .12
4.2.7 Ultrasonic transmitter for use with separate control units .12
4.2.8 Equipment using software and/or digital technologies .12
4.3 Labelling and marking .12
4.4 Instruction manual .12
5 Test methods .14
5.1 Introduction .14
5.2 General requirements for tests .15
5.2.1 Samples and sequence of tests .15
5.2.2 Preparation of equipment before testing .15
5.3 Normal conditions for test .16
5.3.1 General .16
5.3.2 Test gas(es) .16
5.3.3 Power supply .16
5.3.4 Temperature and humidity .16
5.3.5 Pressure.16
5.3.6 Rain .17
5.3.7 Ultrasonic background noise .17
5.3.8 Acclimation time .17
5.3.9 Orientation .17
5.3.10 Communications options .17
5.4 Test methods and performance requirements .17
5.4.1 Test conditions .17
5.4.2 Unpowered storage .19
5.4.3 Calibration, adjustment and repeatability .20
5.4.4 Stability .20
5.4.5 Alarm set point(s) .21
5.4.6 Temperature .21
5.4.7 Vibration .21
5.4.8 Response point .22
5.4.9 Time to alarm .22
5.4.10 Battery capacity .22
5.4.11 Power supply variations .23
5.4.12 Electromagnetic compatibility . 23
5.4.13 Verification of software and digital components . 23
5.4.14 False alarm sources . 23
Annex A (informative) Mass flow rate . 24
Annex B (informative) Test sheet . 25
Annex C (informative) Temperature and humidity dB corrections . 26
Annex D (normative) Hole typical drawings . 27
Annex E (informative) Calibration . 29
Annex F (informative) Background noise generation . 31
European foreword
This document (EN 50724:2023) has been prepared by CLC/TC 31 “Electrical apparatus for potentially
explosive atmospheres”.
The following dates are fixed:
• latest date by which this document has (dop) 2024–08–07
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2026–08–07
standards conflicting with this 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 shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
Introduction
Ultrasonic Gas Leak Detectors (UGLDs) are being increasingly appointed to quickly detect gas leaks from
pressurized systems to complement the use of point or line of sight detectors. The UGLD detects the acoustic
emission generated by the leak, which propagates omni-directionally at the speed of sound. The leak can be
detected at some distance without the gas itself needing to reach the position of the sensor. The main reason
for implementing UGLDs is to improve the response time to detect dangerous gas leaks and to improve the gas
leak detection coverage with the addition of a complementary detection method that is not affected by air flow.
In general terms, an UGLD functions by detecting the ultrasonic noise generated by gas escapes from a high-
pressure area to a low-pressure area through a small aperture (leak). In practice the technique is of value for
detecting leaks from tank/pipelines, etc running at pressures greater than 2 bar. The intensity of this airborne
ultrasound generated by a gas leak is due to a number of factors including but not limited to gas type, gas
pressure, leak size and gas temperature.
An UGLD does not detect specific gas types, measure percentage LFL or ppm concentration level, but instead
responds to the specific ultrasonic sound generated by a pressurized gas leak. The reliable range coverage of
an UGLD is mainly determined by the leak rate of the gas leak, the atmospheric transmission of the ultrasound,
and the potential acoustic background noise that can interfere with the UGLD. The leak rate is mainly determined
by gas pressure and leak size, but molecular weight and gas temperature also plays a role. The leak rate
determines how fast a potentially dangerous gas cloud will be generated. In addition, physical obstructions
between the location of the leak, and the UGLD will also have an influence on the detection range of the detector.
1 Scope
This document refers to UGLDs (ultrasonic gas leak detectors) that work in a frequency beyond the audible
range. This document is applicable to fixed ultrasonic gas leak detection equipment intended to provide an
indication, alarm or other output function for the purpose of initiating automatic or manual protective action(s).
This document sp
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