EN 14624:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Leistung von mobilen Leckdetektoren und Raumüberwachungsgeräten für halogenierte KältemittelPerformances des détecteurs de fuite mobiles et des contrôleurs d'ambiance de fluides frigorigenes halogénésPerformances of mobile leak detectors and of room controllers of halogenated refrigerants71.100.45Hladiva in antifriziRefrigerants and antifreezes27.200Hladilna tehnologijaRefrigerating technologyICS:Ta slovenski standard je istoveten z:EN 14624:2005SIST EN 14624:2005en01-september-2005SIST EN 14624:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14624April 2005ICS 23.040.99; 71.100.45English versionPerformances of mobile leak detectors and of room controllersof halogenated refrigerantsPerformances des détecteurs de fuite mobiles et descontrôleurs d'ambiance de fluides frigorigènes halogènesLeistung von mobilen Leckdetektoren undRaumüberwachungsgeräten für halogenierte KältemittelThis European Standard was approved by CEN on 21 February 2005.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14624:2005: ESIST EN 14624:2005

Conversion factors of leak flux units.14 Annex B (informative)
Conversion of a gas flux to a mass flow.15
Indicating Measuring Room controller A B Locating leak detector C D
The indicator leak detector or room controller can be designed with thresholds: either one fixed threshold that is non-adjustable, or several fixed or adjustable thresholds. The measuring leak detector or room controller includes a graduated scale and permits the association of a gas concentration in the atmosphere and one measurement value. 6 General requirements for all leak detectors 6.1 Gas type The manufacturer shall specify the gas or gas (es) that the leak detector is able to detect or measure. 6.2 Aptitudes to the function Locating leak detectors or room controllers are single-gas or multi-gas. They are selective or non selective and shall be able to measure or indicate the concentration threshold of halogen gas in a reference volume defined by the manufacturer. Selective locating detectors or room controllers are able to identify a defined halogen gas among others. Non-selective locating detectors or room controllers cannot identify one halogen gas among halogen gases but they detect all halogen gases. They can also be non selective - that means detect any type of gas, halogen or not. 6.3 Output signal The indication or the measurement given by the leak detector can be instantaneous or continuous and generates a signal (audible and/or visual). The signal alerts operators in charge of the leak tightness inspection or in charge of supervising the system charged with halogen gas. 6.4 Detection time The manufacturer shall indicate the time necessary to obtain the output signal. 6.5 Recovery time (clean up time) The recovery time is the time required for a leak detection system to indicate the output signal corresponding to the minimum detection threshold when it has been in contact with a leak flow rate of 50 g/year. 6.6 Measure range The leak detector or the room controller shall indicate minimum and maximum concentrations of halogen gas
that they can measure or differentiate. SIST EN 14624:2005

5 000 ppm (V/V) concentration, which corresponds to a leak rate in the range of 3 g/year of R-134a (see Annex B). Testing conditions are detailed in 11.1. SIST EN 14624:2005

Key 1 Calibrated leak 2 Leak detector hose 3 Global stand 4 Leak detector 5 Leak detector stand with variable speed 6 Driving systems of the mobile leak detector stand 7 Minimum distance between the calibrated leak and the sensor nose Figure 1 — Moving leak detector 7.3 Lowest sensitivity threshold when the leak detector is stationary The leak detector stationary in front of a leak location during 10 s, at a distance around 5 mm, shall give an output signal for concentrations between 2 500 ppm (V/V) and 7 500 ppm (V/V) which corresponds to a leak flow rate of around 1 g/year and 6 g/year of R-134a (see calculation Annex B). Testing conditions are detailed in 7.2. 7.4 Leak detection in a polluted ambiance If the concentration of the halogen refrigerant is higher than 10 000 ppm and lower than the practical limit according to EN 378, the leak detector shall be able to consider this range as the new reference zero range (floating zero) and keep its sensitivity for the leak location. SIST EN 14624:2005
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