EN 13192:2001
(Main)Non destructive testing - Leak testing - Calibration of reference leaks for gases
Non destructive testing - Leak testing - Calibration of reference leaks for gases
This draft European Standard specifies the calibration of those leaks that are used for the adjustment of leak detectors for the determination of leakage rate in everyday use. The preferred calibration method in this case is a comparison with a standard leak. In this way the leaks used for routine use become traceable to a primary standard as the ISO 9000 series of standards require.
The comparison procedures are preferably applicable to helium leaks, because this test gas can be selectively measured by a mass spectrometer leak detector (MSLD) (the definition of MLSD is given in EN 1330-8).
Calibration by comparison (see methods A and B below) with known standard leaks is easily possible for leaks with reservoir and leakage rates below 10-7Pa·m3/s.
From 10-7 Pa·m3/s to 10-4 Pa·m3/s no leaks reliable enough to be used as transfer standard exist. Leaks in this range can only be calibrated by measurement of flow in a calibrated capillary tube (see method C below).
Leakage rates greater than 10-4 Pa·m3/s can be measured by flow meters calibrated against primary national standards.
Zerstörungsfreie Prüfung - Dichtheitsprüfung - Kalibrieren von Referenzlecks für Gase
Diese Europäische Norm legt ein Verfahren für das Kalibrieren von den Lecks fest, die zum Einstellen von Leckdetektoren und zur Bestimmung der Leckagerate im alltäglichem Gebrauch verwendet werden. Das bevorzugte Kalibrierverfahren ist in diesem Falle ein Vergleich mit einem Standardleck. Auf diese Weise werden die für Routinezwecke verwendeten Lecks auf einen primären Standard zurückgeführt, wie es die Normen der ISO 9000-Reihe fordern.
Die Vergleichsverfahren sind vorzugsweise auf Heliumlecks anwendbar, weil dieses Prüfgas selektiv mit einem Massenspektrometerleckdetektor (MSLD, Definition siehe EN 1330-8) bestimmt werden kann.
Kalibrieren durch Vergleich mit bekannten Standardlecks (siehe nachstehende Verfahren A und B) ist leicht möglich bei Lecks mit Vorratsbehälter und Leckageraten unter 10-7 Pa × m3/s.
Für den Bereich zwischen 10-7 Pa × m3/s und 10-4 Pa × m3/s gibt es keine Lecks, die zuverlässig genug als Transferstandards sind. In diesem Bereich können Lecks nur durch Messung der Gasströmung in einem kalibrierten Kapillarrohr (siehe nachstehendes Verfahren C) kalibriert werden.
Leckageraten über 10-4 Pa × m3/s können mit Durchflussmengenmessern gemessen werden, die gegen nationale Primärstandards kalibriert wurden.
Essais non destructifs - Contrôle d'étanchéité - Etalonnage des fuites de référence des gaz
La présente Norme européenne spécifie l'étalonnage des fuites utilisées dans le réglage des détecteurs de fuites et la détermination des flux de fuite, dans le cadre d'un usage quotidien. Dans le cas présent, la méthode préférable d'étalonnage est une comparaison avec une fuite de référence. Ainsi, la fuite faisant l'objet d'un usage courant devient traçable par rapport à un étalon primaire, conformément à la série des normes ISO 9000.
Les modes opératoires d'étalonnage par comparaison sont de préférence applicables aux fuites d'hélium, car ce gaz peut être mesuré individuellement au moyen d'un détecteur de fuites à spectromètre de masse (DFSM) (la définition de DFSM est donnée dans l'EN 1330-8)
L'étalonnage par comparaison (voir méthodes A et B ci-dessous) qui utilise des fuites de référence connues est facilement applicable aux fuites de réservoir et à celles dont les débits sont inférieurs à 10-7 Pa.m3/s.
De 10-7 Pa.m3/s à 10-4 Pa.m3/s, il n'existe pas de fuites suffisamment fiables pour être utilisées comme étalons de transfert. Les fuites comprises dans cette gamme peuvent seulement être calibrées en mesurant leur débit dans un tube capillaire calibré (voir méthode C ci-dessous).
Les flux de fuite supérieurs à 10-4 Pa.m3/s peuvent être mesurés au moyen de débitmètres calibrés conformément aux étalons primaires nationaux.
Neporušitveno preskušanje - Preskušanje tesnosti - Umerjanje referenčne tesnosti za plin
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zerstörungsfreie Prüfung - Dichtheitsprüfung - Kalibrieren von Referenzlecks für GaseEssais non destructifs - Contrôle d'étanchéité - Etalonnage des fuites de référence des gazNon destructive testing - Leak testing - Calibration of reference leaks for gases19.100Neporušitveno preskušanjeNon-destructive testingICS:Ta slovenski standard je istoveten z:EN 13192:2001SIST EN 13192:2002en01-junij-2002SIST EN 13192:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13192November 2001ICS 19.100English versionNon destructive testing - Leak testing - Calibration of referenceleaks for gasesEssais non destructifs - Contrôle d'étanchéité - Etalonnagedes fuites de référence des gazZerstörungsfreie Prüfung - Dichtheitsprüfung - Kalibrierenvon Referenzlecks für GaseThis European Standard was approved by CEN on 10 October 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13192:2001 ESIST EN 13192:2002
(normally with reservoir fitted the leak outlet).1511.2Conductance leaks (normally without reservoir).15Annex A
(informative)
Calculation of leakage rate decrease due to tracer gas depletion in the reservoir.16Bibliography.17SIST EN 13192:2002
Typical leakage rates are greater than10-7 Pa·m3/s4.2.2Aperture leak (orifice)Orifice leaks are seldom used in practice, as they are difficult to manufacture and even more prone to blocking thancapillaries.4.2.3Compressed powder leakThis type of leak uses metal powder compressed into a tube. They are usually offered without reservoir. They areused for routine check of the sensitivity of leak detectors but they are not stable enough to be used as calibrationleaks.5Apparatus5.1Mass Spectrometer Leak Detector (MSLD), for methods A and B (see clause 6)To calibrate a leak by comparison to a known standard according to methods A and B described in clause 6, amass spectrometer leak detector is necessary as the transfer device. Such a leak detector shall fulfil the minimumrequirements for the measurement of leakage rate, laid down in EN 13625.The test port of the leak detector shall be equipped with an inlet system consisting of a set of ports with valves(preferably all metal) to couple the standard leak and the unknown leaks to the detection system and to shut off theleaks individually.The leak tightness of the inlet system shall be checked to a suitable level before a calibration is performed so thatambient tracer (e.g. helium of ambient atmospheric air) will not affect the measurement.5.2Capillary measurement tube equipment for method C (see clause 7)To calibrate a leak by measurement of capillary flow according to method C described in clause 7, a calibratedglass capillary tube (preferably with a suitable vent valve at one end, see Figure1) is necessary.An indicator fluid (normally water with some surfactant added or special oils) is used to produce the measurementslug in the capillary.To measure the time of slug movement, a timer or stopwatch will be needed. Instruments based on the timedmovements of a film in a tube are also available, e.g. a bubble flow meter.As conductance leaks normally have no tracer gas reservoir, a separate tracer gas supply is needed or calibrationmay be performed with filtered atmospheric air.SIST EN 13192:2002
It is generally applicable but is mostreliable when the leakage rate of the unknown is close to that of the standard leak. This is because themeasurement uncertainty is directly dependent on the linearity of the leak detector in use. (See 8.1.2.2). As thelinearity error cannot be measured independently, it has to be estimated.
To keep the linearity error small, theoperating characteristics of leak detector should not change during calibration (e.g. automatic ranging should bedisabled).For more precise calibrations, where a definite measure of uncertainty is required or if a standard leak with aleakage rate close to the unknown is not available method B should be used.
By the use of two reference leaks, thenon-linearity of the leak detector is accounted for (see 8.1.2.3).6.1Preparation of leaks and apparatus6.1.1Warm-up of leak detectorThe leak detector used as a transfer device shall be set up according to the manufacturer's manual. The warm-uptime shall be at least 2 h.6.1.2Temperature accommodationThe unknown leak and the standard leak(s) for the comparison shall be stored in the same room where the test isto be carried out for at least 12 h to allow for temperature equilibration (an air-conditioned room is not necessary ifthere are no rapid temperature changes. Because of temperature fluctuations, an air-conditioning system can evenincrease the measurement uncertainty). Th
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