This standard specifies the technical requirements and test methods for the construction, performance, safety and the like of class 1.5 diaphragm gas meters (hereinafter referred to as gas meters) having two pipe or single pipe connections, at maximum working pressures not exceeding 50kPa and maximum actual flow rates not exceeding 160 m3/h over a minimum ambient temperature range of -10℃ to +40℃ and a working medium temperature range no less than 40K.
This standard applies to the gas meters installed in the closed locations (indoor or outdoor with protection) or open locations (outdoor without any protection) with or without vibration and shocks of low significance, condensing humidity or electromagnetic disturbances [including the gas meters installed with electronic auxiliary device (see Appendix C) or built-in mechanical gas temperature conversion device (see Appendix D)].
Unless otherwise stated, all pressures given in this standard are pressure (gauge pressure) against the atmospheric pressure.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all the amendments) applies.
GB/T 191-2008 Packaging-Pictorial Marking for Handling of Goods (ISO 780: 1997, MOD)
GB/T 1771-2007 Paints and Varnishes-Determination of Resistance to Neutral Salt Spray (Fog) (ISO 7253: 1996, IDT)
GB/T 2410-2008 Determination of the Luminous Transmittance and Haze of Transparent Plastics
GB/T 2423.1-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Tests A: Cold (IEC 60068-2-1: 2007, IDT)
GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products-Part 2: Test Methods - Tests B: Dry Heat (IEC 60068-2-2: 2007, IDT)
GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2: Testing Method - Test Cab: Damp Heat Steady State (IEC 60068-2-78: 2001, IDT)
GB/T 2423.17-2008 Environmental Testing for Electric and Electronic Products - Part 2: Testing Method - Test Ka: Salt Mist (IEC 60068-2-11: 1981, IDT)
GB 3836.1-2010 Explosive Atmospheres - Part 1: Equipment - General Requirements (IEC 60079-0: 2007, MOD)
GB 3836.2-2010 Explosive Atmospheres - Part 2: Equipment Protection by Flameproof Enclosures “d” (IEC 60079-1: 2007, MOD)
GB 3836.4-2010 Explosive Atmospheres - Part 4: Equipment Protection by Intrinsic Safety i (IEC 60079-11: 2006, MOD)
GB 4208-2008 Degrees of Protection Provided by Enclosure (IP Code) (IEC 60529: 2001, IDT)
GB 5080.7-1986 Equipment Reliability Testing - Compliance Test Plans for Failure Rate and Mean Time between Failures Assuming Constant Failure rate (IEC 60605-7: 1978, IDT)
GB/T 9113.1-2000 Integral Steel Pipe Flanges with Flat Face or Raised Face
GB/T 9279-2007 Paints and Varnishes-Scratch Test (ISO 1518: 1992, IDT)
GB/T 9286-1998 Paints and Varnishes - Cross Cut Test for Films (eqv ISO 2409: 1992)
GB/T 9978.1-2008 Fire-resistance Tests - Elements of Building Construction - Part 1: General Requirements (ISO 834-1: 1999, MOD)
GB 11186.3-1989 Methods for Measuring the Colour of Paint Films; Part 3: Calculation of Colour Differences (eqv ISO 7724-3: 1984)
GB/T 13893-2008 Paints and Varnishes - Determination of Resistance to Humidity - Continuous Condensation (ISO 6270-1: 1998, IDT)
GB 14536.1-2008 Automatic Electrical Controls for Household and Similar Use - Part 1: General Requirements [IEC 60730-l: 2003, IDT]
GB/T 16422.3-1997 Plastics - Methods of Exposure to Laboratory Light Sources - Part 3: Fluorescent UV Lamps (eqv ISO 4892-3: 1994)
GB/T 17626.2-2006 Electromagnetic Compatibility (EMC) - Testing and Measurement Techniques - Electrostatic Discharge Immunity Test (IEC 61000-4-2: 2001, IDT)
GB/T 17626.3-2006 Electromagnetic Compatibility - Testing and Measurement Techniques - Radiated Radio-frequency Electromagnetic Field Immunity Test (IEC 61000-4-3: 2002, IDT)
GB/T 20624.1-2006 Paints and Varnishes - Rapid-deformation (Impact Resistance) Tests - Part 1: Falling-weight Test Large-area Inderter (ISO 6272-1: 2002, IDT)
ISO 2812-1: 2007 Paints and Varnishes - Determination of Resistance to Liquids - Part 1: Immersion in Liquids other than Water
ISO 4628-2: 2003 Paints and Varnishes - Evaluation of Degradation Coatings - Designation of Quantity and Size of Defects, and of Intensity of Uniform Changes in Appearance - Part 2: Assessment of Degree of Blistering
ISO 4628-3: 2003 Paints and Varnishes - Evaluation of Degradation Coatings - Designation of Quantity and Size of Defects, and of Intensity of Uniform Changes in Appearance - Part 3: Assessment of Degree of Rusting
ASTM D471: 2006 Standard Test Method for Rubber Property - Effect of Liquids
3 Terminologies, Definitions and Symbols
For the purposes of this standard, the following terminologies and definitions apply.
3.1 Terminologies and Definitions
3.1.1
Gas volume meter
Instrument designed to measure, memorize and display the volume of a fuel gas that has passed through it.
3.1.2
Diaphragm gas meter
Gas volume meter in which the gas volume is measured by means of measuring chambers with deformable walls.
3.1.3
Actual flow rate
Flow rate at the gas pressure and gas temperature conditions prevailing in the gas distribution line in which the meter is fitted, at the meter inlet.
3.1.4
Working pressure
Difference between the pressure of the gas at the inlet of the meter and the atmospheric pressure.
