SIST 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



SIST EN 14624:2005



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



EN 14624:2005 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Symbols and abbreviations.5 5 Types of detectors.6 6 General requirements for all leak detectors.6 7 Specific requirements for locating leak detectors.7 8 Specific requirements for room controllers.9 9 Calibrated leaks.9 10 Test apparatus.10 11 Efficiency tests.10 12 Characteristics and presentation of test results.12 13 Labelling.12 Annex A (informative)
Conversion factors of leak flux units.14 Annex B (informative)
Conversion of a gas flux to a mass flow.15
SIST EN 14624:2005



EN 14624:2005 (E) 3 Foreword This document (EN 14624:2005) has been prepared by Technical Committee CEN/TC 182 "Refrigerating systems, safety and environmental requirements", the secretariat of which is held by DIN. 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 2005, and conflicting national standards shall be withdrawn at the latest by October 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Esto-nia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14624:2005



EN 14624:2005 (E) 4 1 Scope The purpose of this document is to qualify performances of leak detectors or room controllers of halogenated re-frigerants. These leak detectors are designed for the detection of CFC, HCFC, HFC and PFC halogenated gases, and their sensitivity is checked with a calibrated leak. 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. EN 378, Refrigerating systems and heat pumps — Safety and environmental requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 chloro-fluoro-carbon CFC fully halogenated halocarbon composed only of chlorine, fluorine and carbon (no hydrogen remaining) 3.2 hydro-chloro-fluoro-carbon HCFC halocarbon composed only of hydrogen, chlorine, fluorine and carbon 3.3 hydro-fluoro-carbon HFC halocarbon composed only of hydrogen, fluorine and carbon 3.4 perfluoro-carbon PFC halocarbon composed only of fluorine and carbon 3.5 gas concentration ratio in weight or in volume of a given gas to the total weight or volume of the gas mixture. The unit is either ppm (m/m) or ppm (V/V), either in percentage (m/m) or (V/V) 3.6 room controller fixed device, with one or several sensors, permitting the indication or the measure of concentrations of halogen gases in the atmosphere in one or several points in the same room or in several rooms 3.7 leak rate gas flow through a fissure, an orifice or whatever tightness default. The usual leak rate unit is the gram per year (g/year), see informative Annexes A and B NOTE This gas flows through channels of some micrometers of diameter with high length/diameter ratio. SIST EN 14624:2005



EN 14624:2005 (E) 5 3.8 indicating leak detector leak detector indicating one or several levels of concentration, but with no value of this (or these) concentrations 3.9 measuring leak detector leak detector that measures gas concentration in a reference volume and that displays the value 3.10 locating leak detector portable either indicator or measure leak detector with a component reacting to halogen gas concentration in the atmosphere 3.11 calibrated leak device with a defined annual mass flow rate in gram(s) of a given gas under defined pressure and temperature conditions. These conditions are defined upstream and downstream of the calibrating device. Calibrated leaks are standardized against a standard leak 3.12 gas flow at constant pressure flow assumed as isotherm with a constant density 3.13 ppm (m/m) parts per million expressed in weight per weight ratio 3.14 ppm (V/V) parts per million expressed in volume per volume ratio 3.15 reference volume volume defined by a real or conventional border used as a reference for the measurement of the concentration in-crease of the gas to be detected 4 Symbols and abbreviations Table 1 — Symbols and abbreviations Symbol Prescription Unit Vacc accumulation value m3 Vmol molar volume m3/kmol M molar mass kg/kmol m& massflow kg/s N& molar mass flow rate mol/s C concentration V/V or m/m SIST EN 14624:2005



EN 14624:2005 (E) 6 5 Types of detectors The types of detectors of Table 2 are concerned. Table 2 — Types of detectors
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



EN 14624:2005 (E) 7 6.7 Repeatability For identical concentration values of a defined halogen gas, the leak detector or the room controller shall give iden-tical indications within an uncertainty range specified by the manufacturer. 6.8 Calibration The calibration frequency of the leak detection system and the reference(s) of calibrated leak(s) shall be mentioned by the manufacturer. 7 Specific requirements for locating leak detectors 7.1 General Locating leak detectors shall be able to indicate halogen gas concentration in two different circumstances, first when the detection probe is moving, second when the detection probe is stationary in front of a leak location. 7.2 Lowest sensitivity threshold when the leak detector is moving The leak detector, moved back and forth ten times, at a speed of 0,2 cm/s ± 10 %, laterally with a lateral length of ± 20 cm around the leak location and passing at 2 mm ± 0,1 mm of this leak location, shall be able to detect a
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



EN 14624:2005 (E) 8
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



EN 14624:2005 (E) 9 7.5 Clean-up and zeroing time Some tightness defaults imply leak flow rat
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