INTERNATIONAL OIML R 49-2 …

1 Water meters for cold potable water and hot 2: Test methodsCompteurs d eau potable froide et d eau 2: M thodes d essaisOIML R 49-2 Edition 2013 (E) oiml R 49-2 Edition 2013 (E)ORGANISATIONINTERNATIONALEDEM TROLOGIEL GALEINTERNATIONALORGANIZATIONOFLEGALMETR OLOGYINTERNATIONALRECOMMENDATION oiml R 49-2:2013 (E) Contents Foreword .. 6 1 Scope .. 7 2 Normative references .. 7 3 Terms and definitions .. 9 4 Reference conditions .. 9 5 Symbols, units and equations .. 9 6 External examination .. 10 General .. 10 Object of the examination .. 10 Preparation .. 10 Examination procedures .. 10 7 Performance tests for all water meters.

2 15 General .. 15 Required conditions for all tests .. 15 Static pressure test ( oiml R 49-1:2013, ) .. 16 Determination of intrinsic errors (of indication) ( oiml R 49-1:2013, ) .. 17 Water temperature test ( oiml R 49-1:2013, ) .. 25 Overload water temperature test ( oiml R 49-1:2013, ) .. 26 Water pressure test ( oiml R 49-1:2013, ) .. 26 Reverse flow test ( oiml R 49-1:2013, ) .. 27 Pressure loss test ( oiml R 49-1:2013, ) .. 28 Flow disturbance tests ( oiml R 49-1:2013, ) .. 32 Durability tests ( oiml R 49-1:2013, ) .. 33 Magnetic field testing .. 40 Tests on ancillary devices of a water 40 Environmental testing.

3 41 8 Performance tests related to influence factors and disturbances .. 41 General requirements ( oiml R 49-1:2013, ) .. 41 Dry heat (non-condensing) ( oiml R 49-1:2013, ) .. 45 Cold ( oiml R 49-1:2013, ) .. 46 Damp heat, cyclic (condensing) ( oiml R 49-1:2013, ) .. 47 Power supply variation ( oiml R 49-1:2013, ) .. 48 Vibration (random) ( oiml R 49-1:2013, ) .. 51 Mechanical shock ( oiml R 49-1:2013, ) .. 52 AC mains voltage dips, short interruptions and voltage variations ( oiml R 49-1:2013, ) .. 53 Bursts on signal lines ( oiml R 49-1:2013, ) .. 56 Bursts (transients) on AC and DC mains ( oiml R 49-1:2013, ).

4 57 Electrostatic discharge ( oiml R 49-1:2013, ) .. 58 Radiated electromagnetic fields ( oiml R 49-1:2013, ) .. 60 Conducted electromagnetic fields ( oiml R 49-1:2013, ).. 62 Surges on signal, data and control lines ( oiml R 49-1:2013, ).. 64 Surges on AC and DC mains power lines ( oiml R 49-1:2013, ) .. 65 3 oiml R 49-2:2013 (E) Static magnetic field ( oiml R 49-1:2013, ) .. 66 Absence of flow test .. 68 9 Test program for type evaluation .. 68 Number of samples required .. 68 Performance test applicable to all water meters .. 68 Performance tests applicable to electronic water meters, mechanical water meters fitted with electronic devices, and their separable parts.

5 69 Type evaluation of separable parts of a water meter .. 70 Families of water meters .. 70 10 Tests for initial verification .. 71 Initial verification of complete and combined water meters .. 71 Initial verification of separable parts of a water meter .. 72 11 Presentation of results .. 73 Object of the reports .. 73 Identification and test data to be included in records .. 73 Annex A (Mandatory) Type examination and testing of checking facilities of electronic devices .. 74 General .. 74 Object of the examination .. 74 Examination procedures .. 74 Action of checking facilities ( oiml R 49-1:2013, ).

6 74 Checking facilities for the measurement transducer ( oiml R 49-1:2013, ) .. 75 Checking facilities for the calculator ( oiml R 49-1:2013, ) .. 76 Checking facilities for the indicating device ( oiml R 49-1:2013, ) .. 78 Checking facilities for ancillary devices ( oiml R 49-1:2013, ) .. 79 Checking facilities for associated measuring instruments ( oiml R 49-1:2013, ) .. 79 Annex B (Mandatory ) Calculating the relative error (of indication) of a water meter .. 81 General information .. 81 Calculation of the error (of indication) .. 81 Calculation of the relative error (of indication) .. 82 Complete water meter.

7 82 Combined water meter .. 82 Calculator (including indicating device) .. 82 Measurement transducer (including flow or volume sensor) .. 84 Annex C (Mandatory) Installation requirements for flow disturbance tests .. 86 Annex D (Mandatory) Type evaluation of a family of water meters .. 88 Families of water meters .. 88 Definition .. 88 Meter selection .. 88 Annex E (Informative) Examples of methods and components used for testing concentric water meters .. 90 4 oiml R 49-2:2013 (E) Annex F (Informative) Determining the density of water .. 93 Density of air-free distilled water at kPa .. 93 Pressure correction factor.

8 93 Density of water at the flowmeter .. 93 Annex G (Informative) Maximum uncertainties in the measurement of influence factors and disturbances .. 95 Introduction .. 95 Simulated signal inputs to 95 Dry heat, damp heat (cyclic) and cold tests .. 95 Supply voltage variation .. 96 Mains frequency variation .. 96 Short time power reduction .. 96 Electrical bursts .. 96 Electrostatic discharge .. 96 Electromagnetic interference .. 97 Mechanical vibration .. 97 Annex H (Informative) Pressure loss test pressure tappings, hole and slot details .. 98 General .. 98 Design of measuring section pressure tappings.

9 98 Pressure tappings, hole and slit details .. 98 Annex I (Mandatory) Flow disturbers .. 101 General .. 101 Threaded type disturbance generators .. 101 Bibliography .. 112 5 oiml R 49-2:2013 (E) Foreword The INTERNATIONAL Organization of Legal Metrology ( oiml ) is a worldwide, intergovernmental organization whose primary aim is to harmonize the regulations and metrological controls applied by the national metrological services, or related organizations, of its Member States. The main categories of oiml publications are: INTERNATIONAL Recommendations ( oiml R), which are model regulations that establish the metrological characteristics required of certain measuring instruments and which specify methods and equipment for checking their conformity.

10 oiml Member States shall implement these Recommendations to the greatest possible extent; INTERNATIONAL Documents ( oiml D), which are informative in nature and which are intended to harmonize and improve work in the field of legal metrology; INTERNATIONAL Guides ( oiml G), which are also informative in nature and which are intended to give guidelines for the application of certain requirements to legal metrology; INTERNATIONAL Basic Publications ( oiml B), which define the operating rules of the various oiml structures and systems; and oiml Draft Recommendations, Documents and Guides are developed by Project Groups linked to Technical Committees or Subcommittees which comprise representatives from oiml Member States.