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BS EN 50724:2023

BS EN 50724:2023

$167.15

Fixed Ultrasonic Gas Leak Detectors (UGLD). General requirements and test methods

Published By Publication Date Number of Pages
BSI 2023 34
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
9 3 Terms and definitions
3.1 Glossary
3.2 Types of equipment
3.3 Sensors
10 3.4 Signals and alarms
11 4 General requirements
4.1 Introduction
12 4.2 Design
4.2.1 General
4.2.2 Indication methods and devices
4.2.2.1 General
4.2.2.2 Display and other devices for indication of measured values
4.2.2.3 Indicator light
13 4.2.3 Alarm signal
4.2.3.1 Alarm settings
4.2.3.2 Alarm output functions
4.2.3.3 Alarm delay
4.2.4 Fault signals
4.2.5 Adjustments
14 4.2.6 Battery-powered equipment
4.2.7 Ultrasonic transmitter for use with separate control units
4.2.8 Equipment using software and/or digital technologies
4.3 Labelling and marking
4.4 Instruction manual
16 5 Test methods
5.1 Introduction
17 5.2 General requirements for tests
5.2.1 Samples and sequence of tests
5.2.1.1 Test samples
5.2.1.2 Test sequence
5.2.2 Preparation of equipment before testing
18 5.3 Normal conditions for test
5.3.1 General
5.3.2 Test gas(es)
5.3.3 Power supply
5.3.4 Temperature and humidity
5.3.5 Pressure
19 5.3.6 Rain
5.3.7 Ultrasonic background noise
5.3.8 Acclimation time
5.3.9 Orientation
5.3.10 Communications options
5.4 Test methods and performance requirements
5.4.1 Test conditions
5.4.1.1 General
5.4.1.2 Reflections from solid structures
5.4.1.3 Reference leak rate
5.4.1.4 Nozzle shape and size used at all leak rate tests
20 5.4.1.5 Time duration of each leak rate test
5.4.1.6 Test leak nozzle height from solid ground
5.4.1.7 Test leak nozzle angling relative to test UGLD
5.4.1.8 Leak test relative to angle of test UGLD
21 5.4.1.9 Wind speed at day of test
5.4.2 Unpowered storage
22 5.4.3 Calibration, adjustment and repeatability
5.4.3.1 Initial preparation of the equipment
5.4.3.2 Calibration curve
5.4.3.3 Repeatability
5.4.4 Stability
5.4.4.1 Battery-powered equipment
5.4.4.2 Fixed equipment
23 5.4.5 Alarm set point(s)
5.4.6 Temperature
5.4.7 Vibration
5.4.7.1 Test equipment
5.4.7.2 Procedures
24 5.4.8 Response point
5.4.9 Time to alarm
5.4.10 Battery capacity
25 5.4.11 Power supply variations
5.4.12 Electromagnetic compatibility
5.4.13 Verification of software and digital components
5.4.14 False alarm sources
26 Annex A (informative)Mass flow rate
A.1 Typical mass release rate conditions
27 Annex B (informative)Test sheet
B.1 Standard test sheet
28 Annex C (informative)Temperature and humidity dB corrections
29 Annex D (normative)Hole typical drawings
31 Annex E (informative)Calibration
33 Annex F (informative)Background noise generation

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BS EN 50724:2023
$167.15