GB/T 39841-2021 Ultrasonic gas meters

GB/T 191-2000 Packaging—Pictorial marking for handling of goods GB/T 191-2008 Packaging—Pictorial marking for handling of goods GB/T 191-2025 Graphical symbols marking for handling and storage of packages 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 GB/T 2423.2-2008 Environmental testing for electric and electronic products—Part 2:Test methods—Tests B:Dry heat GB/T 2423.3-2016 Environmental testing—Part 2:Testing method—Test Cab:Damp heat,steady state GB/T 2423.4-2008 Environmental testing for electric and electronic products—Part 2:Test method—Test Db:Damp heat,cyclic(12 h+12 h cycle) GB/T 2423.24-2013 Enviromental testing—Part 2:Test methods—Test Sa:Simulated solar radiation at ground level and guidance for solar radiation testing GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres—Part 1:General requirements GB 3836.1-2010 Explosive atmospheres—Part 1:Equipment—General requirements GB/T 3836.1-2021 Explosive atmospheres—Part 1:Equipment—General requirements GB 3836.4-2000 Electrical apparatus for explosive gas atmospheres—Part 4:Intrinsic safety“i” GB 3836.4-2010 Explosive atmospheres—Part 4:Equipment protection by intrinsic safety "i" GB/T 3836.4-2021 Explosive atmospheres—art 4:Equipment protection by intrinsic safety “i” GB 3836.8-2003 Electrical apparatus for explosive gas atmospheres—Part 8:Type of protection “n” GB 3836.8-2014 Explosive atmospheres—Part 8:Equipment protection by type of protection “n” GB/T 3836.8-2021 Explosive atmospheres—Part 8: Equipment protection by type of protection “n” GB 3836.14-2000 Electrical apparatus for explosive gas atmospheres—Part 14:Classification of hazardous areas GB 3836.14-2014 Explosive atmospheres—Part 14:Classification of areas—Explosive gas atmosphere GB/T 4208-2017 Degrees of protection provided by enclosure(IP code) GB/T 5169.5-2020 Fire hazard testing for electric and electronic products—Part 5:Test flames—Needle-flame test method—Apparatus,confirmatory test arrangement and guidance GB/T 8897.1-2003 Primary batteries—Part 1:General GB/T 8897.1-2008 Primary batteries—Part 1:General GB/T 8897.1-2013 Primary batteries—Part 1:General GB/T 8897.1-2021 Primary batteries—Part 1:General GB 8897.4-2002 Primary batteries—Part 4:Safety of lithium batteries GB 8897.4-2008 Primary batteries—Part 4:Safety of lithium batteries GB/T 9124.1-2019 Steel pipe flanges—Part 1:PN designated GB/T 9254-2008 Information technology equipment—Radio disturbance characteristics—Limits and methods of measurement GB/T 9978.1-2008 Fire-resistance tests—Elements of building construction—Part 1:General requirements GB/T 10125-2012 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 11020-2005 Flammability of solid non-metallic materials when exposed to flame sources—List of test methods GB/T 11186.3-1989 Methods for measuring the color of paint films—Part 3:Calculation of color differences GB/T 14536.1-2008 Automatic electrical controls for household and similar use—Part 1:General requirements GB/T 16422.3-2014 Plastics—Methods of exposure to laboratory light sources—Part 3:Fluorescent UV lamps GB/T 17626.2-1998 Electromagnetic compatibility—Testing and measurement techniques—Electrostatic discharge immunity test GB/T 17626.2-2006 Electromagnetic compatibility—Testing and measurement techniques—Electrostatic discharge immunity test GB/T 17626.2-2018 Electromagnetic compatibility—Testing and measurement techniques—Electrostatic discharge immunity test GB/T 17626.3-1998 Electromagnetic compatibility—Testing and measurement techniques-Radiated, radio-frequency, electromagnetic field immunity test GB/T 17626.3-2006 Electromagnetic compatibility—Testing and measurement techniques—Radiated, radio-frequency, electromagnetic field immunity test GB/T 17626.3-2016 Electromagnetic compatibility—Testing and measurement techniques—Radiated,radio-frequency,electromagnetic field immunity test GB/T 17626.3-2023 Electromagnetic compatibility—Testing and measurement techniques—Part 3:Radiated,radio-frequency,electromagnetic field immunity test GB/T 17626.4-1998 Electromagnetic compatibility—Testing and measurement techniques—Electrical fast transient/burst immunity test GB/T 17626.4-2008 Electromagnetic compatibility—Testing and measurement techniques—Electrical fast transient/burst immunity test GB/T 17626.4-2018 Electromagnetic compatibility—Testing and measurement techniques—Electrical fast transient/burstimmunity test GB/T 17626.5-1999 Electromagnetic compatibility—Testing and measurement techniques—Surge immunity test GB/T 17626.5-2008 Electromagnetic compatibility—Testing and measurement techniques—Surge immunity test GB/T 17626.5-2019 Electromagnetic compatibility—Testing and measurement techniques—Surge immunity test GB/T 17626.8-1998 Electromagnetic compatibility—Testing and measurement techniques—Power frequency magnetic field immunity test GB/T 17626.8-2006 Electromagnetic compatibility—Testing and measurement techniques—Power frequency magnetic field immunity test GB/T 17626.9-1998 Electromagnetic compatibility Testing and measurement techniques Pulse magnetic field immunity test GB/T 17626.9-2011 Electromagnetic compatibility—Testing and measurement techniques—Pulse magnetic field immunity test GB/T 17626.9-2025 Electromagnetic compatibility—Testing and measurement techniques—Part 9:Impulse magnetic field immunity test GB/T 30789.3-2014 Paints and varnishes—Evaluation of degradation of coatings—Designation of quantity and size of defects,and of intensity of uniform changes in appearance—Part 3:Assessment of degree of rusting