BS EN 16314:2013 BSI Standards Publication Gas meters — Additional functionalities BS EN 16314:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 16314:2013 The UK participation in its preparation was entrusted to Technical Committee GSE/25, Gas Meters A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2013 Published by BSI Standards Limited 2013 ISBN 978 580 75600 ICS 91.140.40 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2013 Amendments issued since publication Date Text affected BS EN 16314:2013 EN 16314 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM July 2013 ICS 91.140.40 English Version Gas meters - Additional functionalities Compteurs gaz - Fonctionnalités supplémentaires Gaszähler - Zusatzfunktionen This European Standard was approved by CEN on 18 April 2013 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 16314:2013: E BS EN 16314:2013 EN 16314:2013 (E) Contents Page Foreword .4 Introduction Scope Normative references .6 3.1 3.2 Terms, definitions and abbreviated terms Terms and definitions Abbreviated terms 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 General requirements 10 Meter 10 Meters with electronic index 10 Suitability – AFD/Meter combination 10 Types of additional functionality devices 10 AFD1 11 AFD2 11 AFD3 11 Resistance to high ambient temperature 12 Climatic environments 12 Gas temperature range 16 Safety Requirements 16 Immunity to electromagnetic disturbances 16 Immunity to electromagnetic disturbances for Meters / AFD’s with external ports 20 Resistance to mishandling 23 Resistance to storage temperature 23 Ageing test 24 Expected lifetime 24 5.1 5.2 5.3 5.4 Security 24 General 24 Software, data and hardware security 25 Firmware upgrade 25 Software identification 26 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Power system 26 General 26 Battery 26 Battery life 27 Battery compartment 27 Battery replacement 28 Battery lifetime totaliser 29 Voltage interruptions 29 Operating voltage 29 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 Additional Functionalities 30 General 30 Display 30 Diagnostics 30 Metrological influence 31 AFD connections 31 Input to AFD 31 Output from AFD 31 Data storage 32 BS EN 16314:2013 EN 16314:2013 (E) 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 Time interval accuracy 33 Energy Calculation within the meter/AFD .34 Tariffs 34 Display/Human interface 35 Gas valve and System 35 Registers .41 Prepayment System with valve 41 Prepayment system without a valve 42 History of Consumption 42 Memory 42 8.1 8.2 Marking 44 Requirements 44 Test 44 9.1 9.2 9.3 9.4 Documentation .44 General 44 Declaration of conformity 45 Technical documentation .45 Instruction manual 45 10 Environmental considerations .45 Annex A (informative) Download software 46 Annex B (informative) Implementation method – Conformity to the SM-CG Additional Functionalities 47 Annex C (normative) Electronic index 50 C.1 General 50 C.2 Display 50 C.3 Display reset 50 C.4 Test signal 51 C.5 Non-volatile memory 51 C.6 Flags and alarms information 52 C.7 Interfaces 52 C.8 Ports 52 C.9 Durability 53 Annex D (normative) Valve type test plan 54 D.1 List of tests .54 D.2 Endurance Test 54 D.3 Toluene/iso-octane test 54 D.4 Water Vapour Test 57 D.5 Ageing Test 59 Bibliography 60 BS EN 16314:2013 EN 16314:2013 (E) Foreword This document (EN 16314:2013) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat of which is held by BSI 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 January 2014, and conflicting national standards shall be withdrawn at the latest by January 2014 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 16314:2013 EN 16314:2013 (E) Introduction This European Standard has been drafted as part of the work being undertaken by the European Standards Organisations (CEN/CENELEC/ETSI) under the Commission Mandate M/441 This standard utilises the six functionalities agreed by the Smart Meters Coordination Group (SM-CG) (see Annex C) as the basis for its additional functionalities It is not necessary for the Additional Functionality Device (AFD) to incorporate all functions This standard builds on CEN/TR 16061 by providing specific requirements for the additional functionality that can be fitted to a gas meter This standard contains requirements for gas valves integral within the meters and controlled by an AFD where the capacity of the gas meter does not exceed 10 m /h Such gas valves are intended for interruption of the gas supply but not replace any valve intended to isolate the gas supply Communications for gas meters are outside the scope of this standard and are covered by the appropriate parts of EN 13757, which provide a number of protocols and transport layers for meter communications for Gas, Water and Heat meters A number of methods can provide the additional functionality for gas meters: these are illustrated below, see Figure 1, and described in detail within this standard The AFD can be integral to the gas meter, attached to the meter or remote from the meter AFD1, AFD2 and AFD3 Gas Meter + AFD1 Additional Functions Gas Meter AFD2 Additional Functions In scope Gas Meter AFD3 Additional Functions Out of scope Other devices, e.g, Home display Other devices, e.g, Home display Other devices, e.g, Home display Figure — Additional functionality device BS EN 16314:2013 EN 16314:2013 (E) Scope This European Standard specifies the additional requirements and tests for gas meters with a maximum capacity of 40 m /h and a maximum operating pressure of not exceeding 500 mbar, conforming to EN 1359, EN 12261, EN 12480, EN 12405 and EN 14236, which have battery powered devices providing additional functionalities that form part of the gas meter (hereafter referred to as meter) or contained in an Additional Functionality Device (AFD) It also covers the additional requirements when an electronic index is used rather that a mechanical one Where the option of an integral valve to the meter is specified, this standard only gives requirements for meters having a maximum capacity not exceeding 10 m /h This European Standard is applicable to first, second and third family gases according to EN 437 This European Standard specifies the construction requirements for electronic components but communication protocols are dealt within other European Standards, e.g appropriate parts of EN 13757 NOTE This European Standard covers connections to auxiliary devices but not the requirements for these devices This European Standard applies to AFDs that are installed in locations with vibration and shocks of low significance and in: closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity, or, if specified by the manufacturer: — open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity, — locations liable to temporary saturation, and in locations with electromagnetic disturbances corresponding to those likely to be found in residential, commercial buildings or similar buildings This European Standard does not cover the changing of metrological software within the meter or the upload/download of metrological software This European Standard only covers valves integral to the meter Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 1359, Gas meters — Diaphragm gas meters EN 12261, Gas meters — Turbine gas meters EN 12405-2, Gas meters — Conversion devices — Part 2: Energy conversion EN 12480, Gas meters — Rotary displacement gas meters EN 13611, Safety and control devices for gas burners and gas-burning appliances — General appliances EN 13757-1, Communication system for meters and remote reading of meters — Part 1: Data exchange EN 13757-2, Communication systems for remote reading of meters — Part 2: Physical and link layer BS EN 16314:2013 EN 16314:2013 (E) EN 13757-3, Communications systems for and remote reading of meters — Part 3: Dedicated application layer EN 13757-4, Communication systems for meters and remote reading of meters — Part 4: Wireless meter readout (radio meter reading for operation in the 868 MHz to 870 MHz SRD band) EN 13757-5, Communications systems for and remote reading of meters — Part 5: Wireless relaying EN 13757-6, Communications systems for and remote reading of meters — Part 6: Local bus EN 14236, Ultrasonic domestic gas meters EN 55022, Information Technology Equipment — Radio disturbance characteristics — Limits and methods of measurement EN 60079 (all parts), Explosive atmospheres EN 60086-1, Primary batteries — Part 1: General EN 60086-4, Primary batteries — Part 4: Safety of lithium batteries EN 60529, Degrees of protection provided by enclosures (IP code) EN 60950-1, Information technology equipment — Safety — Part 1: General requirements EN 61000-4-2, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques — Electrostatic discharge immunity test EN 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test EN 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test EN 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques — Surge immunity test EN 61000-4-6, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques — Immunity to conducted disturbances, induced by radio-frequency fields EN 61000-4-8, Electromagnetic compatibility (EMC) — Part 4-8: Testing and measurement techniques — Power frequency magnetic field immunity test EN 61000-4-9, Electromagnetic compatibility (EMC) — Part 4-9: Testing and measurement techniques — Pulse magnetic field immunity test EN 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for residential, commercial and light-industrial environments EN 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for industrial environments EN 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use — Part 1: General requirements EN 62056-21, Electricity metering — Data exchange for meter reading, tariff and load control — Part 21: Direct local data exchange BS EN 16314:2013 EN 16314:2013 (E) EN ISO 4892-3, Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps (ISO 4892-3) EN ISO 6270-1, Paints and Varnishes — Determination of resistance to humidity — Part 1: Continuous condensation (ISO 6270-1) EN ISO 13849-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1) IEC 61508-1, Functional safety of electrical/electronic/programmable electronic safety-related systems — Part 1: General Requirements ISO 7724-3, Paints and Varnishes — Colorimetry — Part 3: Calculation of colour differences ASTM D1003, Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics (edition 11) 3.1 Terms, definitions and abbreviated terms Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1.1 function process which constantly or at defined intervals, automatically or on demand, performs specific activities such as sampling data, reading a data set, verifying or changing a status, or activating a switch 3.1.2 additional functionality functions over and above that within the meter, which can be integral to the meter, or included within a connected device 3.1.3 additional functionality device carries out the additional functionalities 3.1.4 additional functionality device Type factory fitted additional functionality integral within the meter 3.1.5 additional functionality device Type factory or field fitted additional functionality directly attached to the meter 3.1.6 additional functionality device Type field fitted additional functionality connected to the meter 3.1.7 meter instrument designed to measure, memorise and display the quantity of gas (volume or mass) that has passed it Note to entry: the meter A volume conversion device is a sub-assembly of a meter and therefore in this standard it is part of BS EN 16314:2013 EN 16314:2013 (E) Table B.1 (continued) SM-CG Additional functionalities To support advanced tariffing and payment systems Items considered Implementation method • Ability to measure and record usage in different registers 7.8, 7.11 - Number of registers • Measurement of time 7.9 – Clock • Prepayment / pay-as-you-go management 7.13, 7.15, 7.16- System plus valve 7.2, 7.11, 7.12 Annex C - Retrieval from Registers, index and displays • History of consumption • Peak hourly consumption 7.11 - Not a priority • Demand metering (instantaneous peak) 7.2, 7.9, 7.12, 7.18 Annex C Display, clock, memory and calculator • Storage and retrieval of data • Human/Consumer interaction • Temperature, pressure, Z, CV • Interval metering Calculation engine (e.g kWh, money) Status of the valve (open/closed) 7.11 - Not a priority 7.2, 7.11, 7.12, Annex C Buttons/Display 7.10, 7.11 - Temp/pressure measured / CVDD or attributed 7.9, Clock, 7.18 Annex C - memory 7.2, 7.12, Annex C - Calculate or / display • 48 To allow remote disablement and enablement of supply and flow To provide secure communication enabling the smart meter to export data for display and potential analysis to the end consumer or a third party designated by the end consumer Safe reinstatement of supply consider Note: Flow limitation is not applicable for gas • Communication channel(s) • Human / Consumer interaction 7.13, C.6 - Flags/position status / indicators 7.13 - Valve 7.13 - Safety interlock 5.2 Port or interface 7.2, 7.11, 7.12, C.8 - Buttons / Display BS EN 16314:2013 EN 16314:2013 (E) Table B.1 (continued) SM-CG Additional functionalities To provide information via web portal / gateway to an in-home/building display or auxiliary equipment Items considered Implementation method • Storage and retrieval of data 7.9, 7.18 Annex C Display, clock, memory and calculator • Human/Consumer interaction 7.2, 7.11, 7.12, Annex C Buttons/Display • History of consumption 7.2, 7.11, 7.12, Annex C Retrieval from Registers / memory, index and displays Not a priority • Peak hourly consumption Not a priority • Demand metering (instantaneous peak) 49 BS EN 16314:2013 EN 16314:2013 (E) Annex C (normative) Electronic index C.1 General When a meter conforming to EN 1359, EN 12261 or EN 12480 is equipped with a primary electronic index, this annex and the relevant parts of this standard and the appropriate meter standard shall be used to demonstrate conformity In addition to meeting the relevant requirements of this standard, a meter with the electronic index shall, in all circumstances, withstand the influence factors and disturbances as defined in the appropriate meter standard All the constituent elements of an electronic index shall be constructed of materials having appropriate quality to resist the various forms of degradation which can occur under normal operating conditions as specified by the manufacturer Additional indications shall not be able to be confused with any other indications on the meter C.2 Display C.2.1 Requirements The display on any meter shall have a means to demonstrate that the display is operating correctly C.2.2 Test Confirm by visual inspection and that the display is functioning correctly C.3 Display reset C.3.1 Requirements On the display of any meter/AFD it shall not be possible to reset the metrological result without breaking the metrological seal C.3.2 Test Confirm by visual inspection Using suitable equipment and commands, supplied by the manufacturer, attempt to reset 50 BS EN 16314:2013 EN 16314:2013 (E) C.4 Test signal C.4.1 Requirement If test signal injection is used, when tested in accordance with C 4.2, the means of initiating this test signal injection shall be capable of being sealed such that unauthorised interference is detectable, and such that the metrological seal need not be broken to operate this facility C.4.2 Test By visual inspection C.5 Non-volatile memory C.5.1 Requirements Non-volatile memory shall be incorporated into any AFD that processes metrological and/or financial data The non-volatile memory shall be continuously updated at least every h and shall: a) be accessible at the extremes of the ambient temperature range, as declared by the manufacturer, and b) be maintained without any power source across the maximum and minimum storage temperatures, as declared by the manufacturer When the AFD is tested in accordance with C.5.2 a), the non-volatile memory shall remain accessible and constant at the extremes of the temperature range When the AFD is tested in accordance with C.5.2 b), there shall be no difference between the index readings recorded in 3) and 6) C.5.2 Test a) Access to non-volatile memory 1) Determine a method for accessing the volume index in the non-volatile memory Ensure that there is no difference between the two readings The manufacturer shall declare how this can be performed; 2) cap the meter to prevent any registration; 3) note the meter/AFD index on the display and in the non-volatile memory; 4) subject the meter or AFD to the extremes of ambient temperature, as specified by the manufacturer, for a minimum of h at each temperature; 5) at each of the temperature extremes, at the end of the dwell time, read the volume index from the non-volatile memory b) Maintenance of non-volatile memory 1) Note the meter/AFD index; 2) immediately apply a flow rate equal to Qmax to the meter for a period of min; 3) confirm that the meter/AFD has registered the gas flow, then cap the meter to prevent further registration and immediately note the new meter index, time and relevant information; 51 BS EN 16314:2013 EN 16314:2013 (E) 4) leave the meter/AFD at room temperature for a minimum of h after the time noted in 3) above; 5) remove the battery and subject the meter/AFD to the minimum and maximum storage temperatures, as specified by the manufacturer, for a minimum of h at each temperature; 6) reconnect the battery and compare the current index reading with the reading noted in 3) above C.6 Flags and alarms information C.6.1 Requirement All flags and alarms shall be stored in the event log (see 7.8.3) All information related to alarms shall be stored in a non-volatile memory after voltage interruptions The manufacturer shall declare the form of the flags and the scope of information related to each alarm Clearing of alarm flags shall require authorisation The resetting of the cleared alarm shall be possible only if the cause of the alarm has been eliminated The reset device shall be capable of being sealed C.6.2 Test By visual inspection C.7 Interfaces C.7.1 Requirement Interfaces for communication shall meet the requirement given in the appropriate parts of EN 13757 Communication interfaces for connection to any home automation system shall meet the requirements from the appropriate parts of EN 13757 C.7.2 Test Confirm the communication meets the requirement given in the appropriate parts of EN 13757 C.8 Ports C.8.1 Requirement Where a local physical Interface is fitted it shall meet the requirements given in EN 62056-21 C.8.2 Test The manufacturer presents an appropriate test report, which could be from a third party 52 BS EN 16314:2013 EN 16314:2013 (E) C.9 Durability C.9.1 Requirement If the electronic index assembly and its associated drive incorporates moving parts, when tested in accordance with C.9.2.1 the electronic index shall register volume by detecting signals generated by the meter When tested in accordance with C.9.2.1 and C.9.2.2, the construction of all associated elements shall ensure the proper registering of the gas volume by the index during the lifetime of the meter The input shall respond to every signal in such a manner that no signal is gained or lost; neither reverse nor zero flow shall be registered as an increase or decrease of the volume C.9.2 Test C.9.2.1 Signal detection test Test the electronic index indicating to the input the number of signals which is equivalent for durability test according to appropriate standard for the meter (e.g 000 h at Qmax for meter conforming to EN 1359) Stop signal being transmitted for at least 20 times in a period of h in non-regular intervals Record the number of signals that has been provided to the index input, using separated test device working independently from the index After the test, compare the volume or number of signals registered in the index memory with the volume or signals indicated by separated device The difference shall not exceed 0,05 % The test can be performed at the index associated with the drive C.9.2.2 Reverse flow test When the meter does have a protection against the reverse flow, this point does not apply Test the meter using methodology described in C.9.2.1 indicating 10 sets of signals Each set consists of at least 200 correct flow signals and at least 200 reverse flow signals After the test, compare the number of signals registered for each direction in the index memory with the volume or pulses indicated by separated device and compare the difference 53 BS EN 16314:2013 EN 16314:2013 (E) Annex D (normative) Valve type test plan D.1 List of tests The valve shall be tested as part of a meter Subject to agreement with the test house, these tests shall be made in conjunction with formal testing of the meter to the appropriate European Standard Three meters (incorporating valves) shall be subjected to D.2 All shall pass One meter (incorporating a valve) shall be subjected to D.3 and shall pass One meter (incorporating a valve) shall be subjected to D.4 and shall pass Two meter (incorporating a valve) shall be subjected to D.5 and shall pass If, after testing one meter in accordance with D.3, one meter in accordance with D.4 and two meters in accordance with D.5, the meters are found to comply with these clauses, the meters shall be deemed to be satisfactory D.2 Endurance Test The meter shall be tested in accordance with 7.13.4.5.2 The meter shall be filled with gas or air at the manufacturer's discretion The valve within the meter shall be opened and closed a minimum of: 1) 400 cycles at the minimum temperature of the meter, 2) 400 cycles at maximum temperature of the meter, and 3) 3,200 cycles at test room temperature After each step, the meter shall pass the tests in 7.13.4.5.2 D.3 Toluene/iso-octane test D.3.1 Sequence Before carrying out the tests below, the meter (incorporating a valve) shall pass the test given in 7.13.4.5.2 At the end of Test the meter (incorporating a valve) shall pass the test given in 7.13.4.5.2 At the end of Test the meter (incorporating a valve) shall pass the test given in 7.13.4.5.2 D.3.2 Test Pass through the meter (incorporating a valve) under test nitrogen to which has been added approximately % by gaseous volume of a 30 % toluene/70 % iso-octane mixture (see A.1.4.6) for 42 days (1 008 h) at 54 BS EN 16314:2013 EN 16314:2013 (E) (20 ± 2) °C, (65 ± 10) % relative humidity and a flow rate of not less than 0,25 Qmax of the meter to which the meter is to be fitted NOTE It is important that, when removing the meter from the exercise rig in order to check its operation that the ports be sealed, to prevent the ingress of air, until the meter operation is about to be checked D.3.3 Test After Test 1, exercise the meter (incorporating a valve) under test with air for a further period of days (168 h) at (20 ± 2) °C, (65 ± 10) % relative humidity and a flow rate of not less than 0,25 Qmax of the meter on which the meter is to be used Check the operation of the meter as specified in 7.13.4.5.2 D.3.4 Example of a typical apparatus Referring to Figure D.1, the apparatus consists of the following components: a) An exercise rig (A), open to atmosphere, fitted with a suitable circulating pump or blower b) A nitrogen supply with a flow rate measurement capability (B) (Rotameter, meter or both) c) Relative humidity control (C), comprising a water reservoir and meters capable of giving a relative humidity of (65 ± 10) % The relative humidity is measured by a hair or paper hygrometer or by a moisture meter d) Solvent addition (D) The toluene/iso-octane mixture is added to the top of the vaporisation tower by means of a micro-metering pump The tower has a bottom diffuser plate and is filled with alternate layers of small glass beads and cotton fabric (or other material) to give a large surface area The tower is surrounded with a heating blanket which produces a high temperature at the blanket/tower interface to speed up vaporisation 55 BS EN 16314:2013 EN 16314:2013 (E) Key 10 11 12 13 14 15 16 valves water reservoir for moisture adjustment micro-metering pump rotameter vaporisation tower filled with alternative layers of glass beads and cotton fabric and surrounded by a heating blanket gas meter for volume check toluene/iso-octane reservoir solvent addition (D) blower moisture meter exhaust gas provision and measurement (B) relative humidity control (C) circulating blower valve under test meter exercise rig (A) Figure D.1 — Diagram of toluene/iso-octane test apparatus D.3.5 Procedure Allow the toulene/iso-octane mixture (see D.3.6) to percolate down the tower and vaporise Introduce the carrier gas, at a controlled flow rate, through the diffuser at the bottom of the tower where it picks up the vaporised solvent Pass the gaseous mixture into the exercise rig where it is circulated through the meter under test A fresh supply of solvent is continuously added to give a stable concentration 56 BS EN 16314:2013 EN 16314:2013 (E) D.3.6 Preparation of a % by volume of a 30 % toluene/70 % iso-octane mixture with nitrogen It is estimated that under conditions of normal temperature and pressure g/ml of an ideal gas would occupy 22,4 l Whilst the vapours of toluene and iso-octane cannot be considered ideal, this principle has been used to calculate the (approximate) concentration of % by volume of a 30 % toluene/70 % iso-octane mixture in nitrogen D.3.7 Calculation Toluene has a molecular mass of 92,13 and a density of 0,866 94 g/ml Iso-octane has a molecular mass of 114,23 and a density of 0,691 g/ml 92,13 g equalling 106 ml toluene will occupy 22,4 l at normal temperature and pressure (NTP) 114,23 g equalling 165 ml iso-octane will occupy 22,4 l at normal temperature and pressure (NTP) A % dosage of 30/70 toluene/iso-octane mixture will therefore require: 0,9 % toluene = 95,4 ml toluene; and 2,1 % iso-octane = 346,5 ml iso-octane per 240 l of carrier gas The total volume of solvent mixture to be added to 240 l of carrier gas to give a % concentration by volume of 30 % toluene/70 % iso-octane is 441,9 ml This is equivalent to 0,197 ml per litre of carrier gas NOTE The actual amount of solvent to be added to the system will be dependent on the carrier gas flow rate and the conditions inside the tower D.4 Water Vapour Test Check the operation of the meter (incorporating a valve) in accordance with 7.13.4.5.2 Connect the meter to the water vapour test rig (see Figure D.2) 57 BS EN 16314:2013 EN 16314:2013 (E) Key circulating blower saturated solution for humidity control (2) moisture meter valve under test Figure D.2 — Example of a water vapour test apparatus In Figure D.2, the meter is shown connected to a test rig which consists of a closed circuit containing a suitable circulating pump or blower (1), a chamber containing either a saturated solution of Potassium Acetate (CH3COOK) to give a relative humidity of 20 % at 20 °C, or a saturated solution of Potassium Hydrogen Sulphate (KHSO4) to give a relative humidity of 86 % at 20 °C (2), and a hair or paper hygrometer with a range of % to 100 % relative humidity (3) Pass air having a relative humidity of less than 20 % through the meter for days (168 h) at (20 ± 2) °C and a flow rate of not less than 0,25 Qmax of the meter on which the meter is to be used At this point, check that the meter passes the test given in 7.13.4.5.2 On completion of this low humidity performance test, pass air having a relative humidity of (85 ± 5) % through the meter for 42 days (1 008 h) at (20 ± 2) °C and a flow rate of not less than 0,25 Qmax of the meter on which the meter is to be used At the end of this test, check that the meter passes the test given in 7.13.4.5.2 58 BS EN 16314:2013 EN 16314:2013 (E) Pass air having a relative humidity of less than 20 % for at least days (168 h) at (20 ± 2) °C and a flow rate of not less than 0,25 Qmax of the meter on which the meter is to be used At the end of this test, check that the meter passes the test given in 7.13.4.5.2 D.5 Ageing Test Check the operation of the valve in accordance with 7.13.4.5.2 Store two valves at any of the temperatures given in Table D.1, with one valve in the closed and the other in the open position for the selected time period given in Table D.1 The temperature at which the test is to be carried out is declared by the meter manufacturer On completion of the test, return the valve to normal laboratory temperature and check the operation of the valve and the leakage in-accordance with the requirements in 7.13.4.5.1 and 7.13.4.6.1 Table D.1 — Temperature/times ageing periods Temperature (°C) Time period (days) 70 ± 50 60 ± 100 50 ± 200 59 BS EN 16314:2013 EN 16314:2013 (E) Bibliography [1] NTA 8130, Minimum set of functions for metering of electricity, gas and thermal energy for domestic customers [2] WELMEC, 7.2: Software Guide [3] WELMEC, 11.1: Measuring Instruments Directive 2004/22/EC — Common Application for utility meters [4] OIML R 137-1, Gas Meters — Part 1: Requirements [5] EN 437, Test gases — Test pressures — Appliance categories [6] CEN/TR 16061, Gas meters — Smart gas meters [7] EN 1776, Gas supply systems — Natural gas measuring stations — Functional requirements [8] CEN Guide 4, Guide for addressing 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