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BS EN 17526:2021:2022 Edition

BS EN 17526:2021:2022 Edition

$215.11

Gas meter. Thermal-mass flow-meter based gas meter

Published By Publication Date Number of Pages
BSI 2022 88
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This document specifies requirements and tests for the construction, performance, safety and production of battery powered class 1,5 Capillary Thermal-Mass Flow sensor gas meters (hereinafter referred to as meter(s)). This applies to meters having co-axial single pipe, or two pipe connections, which are used to measure volumes of fuel gases of the 2nd and/or 3rd family, as given in EN 437:2018. In general, the term ā€œthermal mass flow metersā€ applies to a flow-measuring device using heat transfer to measure and indicate gas flowrate, as defined in ISO 14511. NOTE 1 Although the word ā€œmassā€ is present in the definition of the measurement principle, gas meters covered by this document provide measurement of gas at base conditions of temperature and pressure. These meters have a maximum working pressure not exceeding 0,5 bar and a maximum flowrate not exceeding 160 m3/h over a minimum ambient temperature range of āˆ’10 Ā°C to +40 Ā°C and a gas temperature range as specified by the manufacturer with a minimum range of 40 Ā°C. This document applies to meters indicating volume at base conditions, which are installed in locations with vibration and shocks of low significance. It applies to meters in: – closed locations (indoor or outdoor with protection, as specified by the manufacturer) with condensing humidity or with non-condensing humidity; or, if specified by the manufacturer: – open locations (outdoor without any covering) both with condensing humidity or with non-condensing humidity; and in locations with electromagnetic disturbances likely to be found in residential, commercial and light industrial use. For meters which indicate unconverted volume, reference can be made to Annex C. Unless otherwise stated, all pressures given in this document are gauge pressures. Requirements for electronic indexes, valves and additional requirements for batteries incorporated in the meter and any other additional functionalities are given in EN 16314:2013. Unless otherwise stated in a particular test, the tests are carried out on meters that include additional functionality devices intended by the manufacturer. Clauses 1 to 13 are for design and type testing only.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
12 3 Terms, definitions and symbols
3.1 Terms and definitions
16 3.2 Symbols
17 4 Working conditions
4.1 General
4.2 Base conditions
4.3 Flow range
18 4.4 Maximum working pressure
4.5 Temperature range
4.5.1 General
4.5.2 Ambient temperature range
19 4.5.3 Gas temperature range
4.5.4 Storage temperature range
4.6 Range of gases
4.7 Installation orientation
5 Metrological performance
5.1 General
20 5.2 Test mode comparison
5.2.1 General
5.2.2 Requirements
21 5.2.3 Test
5.2.4 Test mode in flow (optional)
5.2.4.1 General
5.2.4.2 Requirements
5.2.4.3 Test
5.3 Permissible errors
5.3.1 Requirements
22 5.3.2 Test
5.3.2.1 General
5.3.2.2 Method a)
23 5.3.2.3 Method b)
5.3.2.4 Air and gas errors
5.3.2.5 Temperature errors
5.4 Gas-air relationship
5.4.1 General
5.4.2 Requirements
24 5.4.3 Test
5.5 Pressure absorption
5.5.1 Requirements
25 5.5.2 Test
5.6 Metrological stability
26 5.7 Immunity to contaminants in gas stream (dust test)
5.7.1 Requirements
27 5.7.2 Specification of contamination dust to be used in test 5.7.3
5.7.3 Test
29 5.8 Flow disturbances
5.8.1 Requirements
5.8.2 Test
5.8.2.1 General
5.8.2.2 Installation effects
30 5.8.2.3 Resistance to harmonic disturbances of the flow
31 5.8.2.4 Registration of volumes due to flow oscillations
33 5.9 Zero flow
5.9.1 Requirements
34 5.9.2 Test
5.10 Reverse flow
5.10.1 Requirements
5.10.2 Test
5.11 Low flow registration (starting flow rate)
5.11.1 Requirements
5.11.2 Test
5.12 Overload flow rate
5.12.1 Requirements
5.12.2 Test
35 5.13 MM – Pulsed (unsteady) flow
5.13.1 General
5.13.2 Requirements
5.13.3 Test
6 Construction and materials
36 6.1 Mechanical interference
6.1.1 Requirements
6.1.2 Test
6.2 Unauthorized interference
6.2.1 Requirements
6.2.2 Test
37 6.3 Robustness of meter case
6.3.1 Meter case
6.3.2 Protection against penetration of dust and water
6.3.2.1 Requirements
6.3.2.2 Test
6.3.3 External leak tightness
6.3.3.1 Requirements
6.3.3.2 Test
38 6.3.4 Resistance to internal pressure
6.3.4.1 Requirements
6.3.4.2 Test
6.3.5 Heat resistance
6.3.5.1 Requirement
6.3.5.2 Test
6.3.6 Resistance to impact
6.3.6.1 Requirements
6.3.6.2 Apparatus
40 6.3.6.3 Test
41 6.3.7 Resistance to mishandling
6.3.7.1 Requirements
6.3.7.2 Test
6.4 Connections
6.4.1 Orientation
6.4.1.1 Requirements
42 6.4.1.2 Test
6.4.2 Threads and flanges for single and two pipe meters
6.4.2.1 Requirements
44 6.4.2.2 Test
45 6.4.3 Strength
6.4.3.1 Torque
6.4.3.2 Bending moment
46 6.5 Resistance to vibration
6.5.1 Requirements
6.5.2 Apparatus
47 6.5.3 Test
48 6.6 Corrosion protection
6.6.1 General
6.6.2 External corrosion
6.6.2.1 Scratch resistance of the protective coating
6.6.2.2 Adhesion of the protective coating
6.6.2.3 Impact resistance of the protective coating
49 6.6.2.4 Chemical resistance of the protective coating
6.6.2.5 Resistance to salt spray
6.6.2.6 Resistance to humidity
6.7 Flame retardance of external surfaces
6.7.1 Requirements
6.7.2 Test
50 6.8 Requirements for rubber components in the gas path
6.8.1 Requirements
6.8.2 Test
6.9 Resistance to storage temperature range
6.9.1 Requirements
6.9.2 Test
6.10 Resistance to toluene/iso-octane vapour
6.10.1 Requirements
6.10.2 Test
6.10.2.1 General
6.10.2.2 Example of a typical apparatus
52 6.10.2.3 Toluene/iso-octane mixture with nitrogen
6.10.2.4 Procedure
6.11 Resistance to water vapour
6.11.1 Requirements
6.11.2 Test
6.11.3 Example of a typical apparatus
53 6.12 Ageing
6.12.1 Requirements
6.12.2 Test
54 7 Optional features
7.1 Pressure measuring point
7.1.1 Requirements
7.1.2 Test
55 7.2 Electrical insulating feet (optional)
7.2.1 Requirements
7.2.2 Test
7.3 Resistance to high ambient temperatures
7.3.1 Requirements
56 7.3.2 Test
7.3.3 Example of a typical resistance to high ambient temperature test apparatus
57 7.4 Additional functionalities (if fitted)
7.4.1 Requirements
7.4.2 Test
58 7.5 Use in hazardous zones
7.5.1 Requirement
7.5.2 Test
8 Index
8.1 Recording and storage
8.1.1 Requirement
8.1.2 Test
8.2 Display
8.2.1 Requirements
59 8.2.2 Test
8.3 Display functionality
8.3.1 Requirements
8.3.2 Test
60 8.4 Non-volatile memory
8.4.1 Requirements
8.4.2 Test
8.4.2.1 Method a)
8.4.2.2 Method b)
61 9 Marking
9.1 All meters
9.2 Two-pipe meters
9.2.1 Requirements
9.2.2 Test
62 9.3 Durability and legibility of marking and labels
9.3.1 Requirements
9.3.2 Tests
9.3.2.1 Weathering test
63 9.3.2.2 Adhesion of metrology label test
9.4 Indelibility of marking
9.4.1 Requirement
9.4.2 Tests
10 Software
10.1 Requirements
10.2 Test
64 11 Communications
11.1 General
11.1.1 Requirements
11.1.2 Test
11.2 Metrological influence of radio communication function
11.2.1 Requirements
11.2.2 Test
65 11.3 Test mode
11.3.1 Requirements
11.3.2 Test
11.4 Data optical port (optional)
11.5 Galvanic port (optional)
11.6 Diagnostics
11.6.1 Requirements
66 11.6.2 Test
11.6.3 Display flags
11.6.3.1 Requirements
11.6.3.2 Test
67 12 Battery
12.1 General
12.2 Additional requirements
12.2.1 Voltage interruptions
12.2.1.1 Requirement
12.2.1.2 Test
12.2.2 Minimum operating voltage
12.2.2.1 Requirements
12.2.2.2 Test
12.2.3 Battery life
12.2.3.1 Requirements
12.2.3.2 Test
13 Immunity to electromagnetic disturbances
13.1 General
68 13.2 Electrostatic discharge
13.2.1 Requirements
13.2.2 Test
13.3 Radio frequency electromagnetic field
13.3.1 Requirements
13.3.2 Test
69 13.4 Electromagnetic induction (power frequency)
13.4.1 Requirements
13.4.2 Test
13.5 Electromagnetic induction (pulsed field)
13.5.1 Requirements
13.5.2 Test
13.6 Radio interference suppression
13.6.1 Requirements
13.6.2 Test
70 14 Instructions
15 Meters supplied for testing
73 16 Production requirements
74 Annex A (informative)Key physical property of gases for meter performance testing
A.1 General
A.2 Basic theory
A.3 Selection criteria for test gases
76 Annex B (normative)Gases for meter performance testing
B.1 General
B.2 Test gases for 2nd family gases
77 B.3 Test gases for 3rd family gases
78 Annex C (informative)Meters without temperature or pressure conversion
C.1 Scope
C.2 Meters without temperature conversion
C.2.1 Error of indication
C.2.1.1 Requirements
C.2.1.2 Test
C.3 Meters without pressure conversion
C.3.1 Error of indication
C.3.1.1 Requirements
C.3.1.2 Test
79 Annex D (normative)Production requirements for gas meters
D.1 Specification
D.2 Technical requirements
D.3 Certificates of conformity
81 Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2014/32/EU Measuring Instruments Directive aimed to be covered

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BS EN 17526:2021
$215.11