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ILNAS-EN 50724:2023 Edition 09/2023
Fixed Ultrasonic Gas Leak Detectors (UGLD) - General requirements and test methods
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Abstract

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.

Status

Standard - Active

Origin

Technical Committee :
CLC/TC 31 : Electrical apparatus for potentially explosive atmospheres

Implementation

start of the vote on the project    08/07/2022   date of ratification (dor)    07/08/2023
end of the vote on the project    30/09/2022   date of anouncement (doa)    07/02/2024
start of the vote on the final project    05/05/2023   date of publication (dop)    07/08/2024
end of the vote on the final project    30/06/2023   date of withdrawal (dow)    07/08/2026


Publication Official Journal
of the Grand-Duchy of Luxembourg 		19/03/2024
Reference Mémorial A N° 118

International Classification for Standards (ICS codes) :

13.320 : Alarm and warning systems
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