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NBN EN 14236 : 2007
Current
The latest, up-to-date edition.
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Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Normal operating conditions
4.1 Flow range
4.2 Maximum working pressure
4.3 Temperature range
4.4 Range of gases
4.5 Orientation
5 Metrological performance
5.1 General
5.2 Mode comparison
5.3 Permissible errors
5.4 Gas - air relationship
5.5 Pressure absorption
5.6 Metrological stability
5.7 Immunity to contaminants in gas stream
5.8 Installation effects
5.9 Zero flow
5.10 Reverse flow
5.11 Low flow registration
5.12 High flow registration
5.13 Pulsed (unsteady) flow
5.14 Temperature sensitivity
6 Construction and materials
6.1 General
6.2 Robustness of meter case
6.3 Corrosion protection
6.4 Casework decorative finish
6.5 Ageing of non-metallic casework
6.6 Ageing of external surfaces of the meter, including
index windows and adhesion of the index window
6.7 Protection against solar radiation
6.8 Resistance to external humidity
6.9 Flame retardance of external surfaces
6.10 Resistance to storage temperature range
6.11 Resistance to the effects of toluene/iso-octane vapour
6.12 Resistance to water vapour
6.13 Ageing
7 Optional features
7.1 Pressure measuring point
7.2 Resistance to high ambient temperature
7.3 Meters with temperature conversion
7.4 Ancillary devices (if fitted)
7.5 Use in hazardous zones
8 Index
8.1 Recording and storage
8.2 Display
8.3 Segmental display
8.4 Non-volatile memory
8.5 Display reset
9 Marking
9.1 All meters
9.2 Two-pipe meters
9.3 Durability and legibility of marking
9.4 Accompanying information
10 Software
10.1 Requirements
10.2 Test
11 Communications
11.1 General
11.2 Character transmission
11.3 Communications protocol
11.4 Data
11.5 Test-mode
11.6 Data optical port
11.7 Galvanic port (optional)
11.8 Diagnostics
12 Battery
12.1 General
12.2 Voltage interruptions
12.3 Minimum operating voltage
12.4 Battery life
13 Immunity to electromagnetic disturbances
13.1 General
13.2 Electrostatic discharge
13.3 Radio frequency electromagnetic field
13.4 Electromagnetic induction (power frequency)
13.5 Electromagnetic induction (pulsed field)
13.6 Radio interference suppression
14 Ultrasonic (acoustic) noise interference
14.1 Requirements
14.2 Test
15 Meters supplied for testing
Annex A (informative) Test gases
A.1 General
A.2 Test gas properties
Annex B (normative) Production requirements for gas meters
B.1 Specification
B.2 Technical requirements
B.3 Certificates of conformity
Annex C (normative) Meters with gas temperature conversion
devices
C.1 Scope
C.2 Metrological performance
Annex ZA (informative) Relationship between this European
Standard and the Essential Requirements
of EU Directive 2004/22 Measuring
Instruments Directive
Bibliography
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