GB/T 6968-2019Diaphragm gas meters (English PDF)

1 Scope

This standard specifies the terms, definitions, symbols, working conditions, technical requirements, test methods, and inspections of membrane gas meters (hereinafter referred to as gas meters).

Inspection rules, packaging, transportation and storage.

This standard is applicable to the maximum working pressure not exceeding 50 kPa, the maximum flow rate not exceeding 160 m3/h, and the accuracy level being 1.5.

Gas meter.

Note. Unless otherwise stated, the pressures referred to in this standard refer to relative atmospheric pressure (gauge pressure).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191 packaging storage and transportation icon

GB/T 2410-2008 Determination of transmittance and haze of transparent plastics

GB/T 2423.3-2016 Environmental testing - Part 2. Test method test Cab. constant damp heat test

GB/T 2423.17-2008 Environmental testing of electric and electronic products - Part 2. Test method test Ka. salt spray

GB 3836.1 Explosive atmosphere - Part 1. General requirements for equipment

Explosive atmospheres - Part 2. Equipment protected by flameproof enclosure "d"

Explosive atmospheres - Part 4. Equipment protected by intrinsically safe "i"

GB/T 4208-2017 enclosure protection grade (IP code)

GB/T 5080.7-1986 Equipment reliability test Verification test for failure rate and mean time between failures under the assumption of constant failure rate

Inspection plan

GB/T 8897.1 Primary batteries Part 1. General

GB 8897.4 Primary batteries - Part 4. Safety requirements for lithium batteries

GB/T 9113-2010 integral steel pipe flange

GB/T 9978.1 Fire resistance test methods for building components - Part 1. General requirements

GB/T 10125-2012 Artificial atmosphere corrosion test salt spray test

GB/T 11186.3-1989 Methods of measurement of colour of coatings - Part 3

GB/T 13893-2008 Determination of moisture resistance of paints and varnishes - Continuous condensing method

GB/T 14536.1-2008 Automatic controls for household and similar use - Part 1. General requirements

GB/T 16422.3-2014 exposure test methods for light source of plastics - Part 3. Fluorescent UV lamps

GB/T 17626.2-2006 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test

GB/T 17626.3-2016 Electromagnetic compatibility test and measurement technology RF electromagnetic field radiation immunity test

GB/T 17626.4-2008 Electromagnetic compatibility test and measurement technology Electrical fast transient burst immunity test

GB/T 17626.5-2008 Electromagnetic compatibility test and measurement technology Surge (impact) immunity test

GB/T 30789.3-2014 Paint and varnish coating aging evaluation of the number and size of defects and the appearance of uniform changes

Identification of degrees - Part 3. Assessment of rust grade […]