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GB/T 778.1-2018 English PDF (GBT778.1-2018)

GB/T 778.1-2018 English PDF (GBT778.1-2018)

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GB/T 778.1-2018: Meters for cold potable water and hot water -- Part 1: Metrological requirements and technical requirements
GB/T 778.1-2018
Meters for cold potable water and hot water--Part 1. Metrological requirements and technical requirements
ICS 91.140.60
N12
National Standards of People's Republic of China
Replace GB/T 778.1-2007
Drinking cold water meter and hot water meter
Part 1. Measurement requirements and technical requirements
Part 1.Metrologicalrequirementsandtechnicalrequirements
(ISO 4064-1.2014, Watermetersforcoldpotablewaterandhotwater-
Part 1. Biological andtechnicalrequirements, IDT)
Published on.2018-06-07
2019-01-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
GB/T 778 "Drinking cold water meter and hot water meter" is divided into the following five parts.
--- Part 1. Measurement requirements and technical requirements;
--- Part 2. Test methods;
--- Part 3. Test report format;
--- Part 4. Non-metering requirements not included in GB/T 778.1;
--- Part 5. Installation requirements.
This part is the first part of GB/T 778.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 778.1-2007 "Measurement of water flow in closed full pipelines. Drinking cold water meter and hot water meter. Part 1
Points. Specification, the main technical changes compared with GB/T 778.1-2007 are as follows.
--- Modified the standard name;
--- Expanded the scope of application of the standard, did not specify the maximum allowable working pressure (see Chapter 1, Chapter 1 of the.2007 edition);
---Adjusted the standard structure;
--- Added the terms "water meter", "rate control device", "preset device", "fixed customer water meter", "plug-in water meter", "plug-in water meter"
Interface "" interchangeable metering module water meter" "interchangeable metering module" "interchangeable metering module water meter connection interface" "error" "resistant
"Permanence" "Measurement conditions" "Resolution of display device" "Multiple water meter conversion flow rate" "Endurance test" "Temperature stability" "Pre-existing
“Environmental adaptation”, “recovery”, “type evaluation” and “type approval” (see 3.1.1, 3.1.9, 3.1.10, 3.1.12, 3.1.20, 3.1.21,
3.1.22, 3.1.23, 3.1.24, 3.2.4, 3.2.10, 3.2.11, 3.2.14, 3.3.6, 3.4.7, 3.4.8, 3.4.9, 3.4.10, 3.4. 11,
3.4.12, 3.4.13);
--- Modified the terms "detection component", "correction device", "initial basic error", "operating temperature", "impact factor", "rated working condition"
Definition of “P-type automatic inspection device” (see 3.1.3, 3.1.7, 3.2.7, 3.3.10, 3.4.2, 3.4.4, 3.5.6,.2007 edition)
3.26, 3.32, 3.49, 3.17, 3.50, 3.5, 3.40);
--- Removed the terms "minimum allowable working pressure" "limit condition" "power supply unit" (see 3.15, 3.6, 3.43 of.2007 edition);
--- Modified the selection of the value of Q3/Q1 (see 4.1.4, 5.1.2 of.2007 edition);
--- Deleted the determination of the reference traffic (see 5.1.5 of the.2007 edition);
--- Increased the classification of the water meter accuracy level, increasing the maximum allowable error requirement of the level 1 table (see 4.2.2);
--- Deleted the "Temperature Level" table reference conditions column (see 5.4.1 of the.2007 edition);
--- Increased the requirements for different flow rates and measurement ranges in both directions of the countercurrent meter (see 4.2.7);
--- Increased the requirement that the water meter does not damage the leak when static pressure is applied (see 4.2.10);
--- Added the requirement for replacement of the battery on the non-replaceable battery, and the minimum service life requirement (see 5.2.3.2);
--- Increased minimum service life requirements for replaceable batteries when the battery is low (see 5.2.4.2);
--- Increased the requirement to replace the battery without damaging the metering seal (see 5.2.4.4);
--- Increased the design of the water meter should be inconvenient to implement fraud, should not be beneficial to either party's requirements (see 6.1.7, 6.1.9);
--- Increased water meter adjustment should not be beneficial to either party's requirements (see 6.2.1);
--- Increased the requirements for water meter installation conditions (see 6.3);
--- Increased the requirement for accuracy grade and pressure loss grade on the nameplate (see 6.6.2);
--- Removed the requirement on the nameplate for the type of output signal provided to the auxiliary device (see 6.8 of the.2007 edition);
--- Revised to provide environmental rating and electromagnetic compatibility rating only on nameplates with electronic water meters (see 6.6.2,.2007 edition)
6.8);
--- Increased display requirements for electronic pointing devices (see 6.7.2.2);
--- Increased the resolution requirements for the indicating device of the Class 1 water meter (see 6.7.3.2.3);
--- Increased the requirements for dual water meter indicating devices (see 6.7.3.3);
--- Removed the requirement for additional verification components (see 6.6.3.3 of the.2007 edition);
--- Increased measurement control content, including type testing and first verification requirements (see Chapter 7);
--- Removed Appendix A and Appendix B of the.2007 edition;
--- Added an appendix to the "Performance Test for Water Meters with Electronic Devices" (see Appendix A);
--- Added "Approval Errors in Use and Subsequent Verification" appendix (see Appendix C).
This section uses the translation method equivalent to ISO 4064-1.2014 "Drinking cold water meters and hot water meters - Part 1. Metrology and technology
Claim".
This standard has made the following editorial changes.
--- Modified the standard name.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Industrial Process Measurement Control and Automation Standardization Technical Committee (SAC/TC124).
This section drafted by. Shanghai Industrial Automation Instrumentation Research Institute Co., Ltd., Ningbo Water Meter Co., Ltd., Sanchuan Smart Technology Unit
Co., Ltd., Ningbo Donghai Instrument Waterway Co., Ltd., Suzhou Waterworks Co., Ltd., Zhejiang Institute of Metrology, Henan Province
Institute of Scientific Research, Ningbo Metrology and Testing Institute, Nanjing Water Group Co., Ltd. Water Meter Factory, Chongqing Smart Water Co., Ltd., Wuxi Water
Table limited liability company, Shanghai Water Meter Factory, Shanghai Instrumentation Automatic Control System Inspection and Testing Institute, Hangzhou Water Meter Co., Ltd., Shenzhen Jiexian Digital
Technology Co., Ltd., Huizhong Instrument Co., Ltd., Fuzhou Kerong Instrument Co., Ltd., Yangzhou Hengxin Instrument Co., Ltd., Beijing
Lai Shui Group Jingzhao Water Meter Co., Ltd., Jinan Ruiquan Electronics Co., Ltd., Hangzhou Jingda Electronics Co., Ltd., Jiangyin Lixin Intelligent Design
Preparation Co., Ltd., Hunan Changde Water Meter Manufacturing Co., Ltd., Ningbo Jingcheng Technology Co., Ltd., Hunan Weiming Energy Technology Co., Ltd.
Division, Qingdao Jicheng Electronics Co., Ltd., Tianjin Sain Energy Technology Co., Ltd.
The main drafters of this section. Li Minghua, Zhao Shaoman, Song Caihua, Lin Zhiliang, Yao Fujiang, Zhao Jianliang, Cui Yaohua, Ma Jun, Lu Congwen,
Wei Qinghua, Zhang Qing, Chen Yu, Xie Jianliang, Chen Jian, Zhang Jichuan, Chen Hanzhang, Zhang Jian, Zhang Wenjiang, Dong Liangcheng, Du Jiquan, Han Lu, Zhu Zhengjian,
Tang Tianshun, Liao Jie, Zhang Dexia, Zuo Wei, Wang Jianing, Song Yanyong, Wang Xinxin, Wang Qinli.
The previous versions of the standards replaced by this section are.
---GB 778-1984;
---GB/T 778.1-1996, GB/T 778.1-2007.
Drinking cold water meter and hot water meter
P...
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