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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
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
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; --- Increased minimum service life requirements for replaceable batteries when the battery is low (see; --- Increased the requirement to replace the battery without damaging the metering seal (see; --- 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; --- Increased the resolution requirements for the indicating device of the Class 1 water meter (see; --- Increased the requirements for dual water meter indicating devices (see; --- Removed the requirement for additional verification components (see 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
Part 1. Measurement requirements and technical requirements
1 Scope
This part of GB/T 778 specifies a drinking cold water meter that measures the flow of water in a closed full pipe and is equipped with a cumulative flow indicating device. The measurement requirements and technical requirements of hot water meters. This section applies to both water-based and mechanical-based water meters, as well as based on electrical or electronic principles and based on mechanical principles, A water meter used to measure the volumetric flow of drinking cold water and hot water. This section also applies to electronic aids that are usually available as an option. However, national regulations may stipulate that certain options are water meters. Essential aids.
Note. National regulations are higher than the provisions of this section. 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Drinking cold water and hot water meters - Part 2. Test methods (ISO 4064-2.2014, IDT) 3 Terms and definitions
The following terms and definitions apply to this document.
Note. These terms are the same as in ISO /IEC Guide 99.2007/OIMLV2-200.2012[1], OIMLV1.2013[2] and OIMLD11[3], listed here. Certain terms modify the definition of ISO /IEC Guide 99.2007/OIMLV2-200.2012 and OIMLD11. 3.1 Water meter and its components
Water meter watermeter
A meter for continuously measuring, recording, and displaying the volume of water flowing through a measurement sensor under measurement conditions. Note 1. The water meter includes at least a measuring sensor, a calculator (including adjustment and correction devices), and a pointing device. The three can be placed in different enclosures. Note 2. The water meter can be a double water meter (see 3.1.16).
Measuring sensor measurementtransducer
The water meter converts the measured water flow or water volume into a component that sends a signal to the calculator, which contains the sensing element. Note. Measurement sensors can be based on mechanical principles, electrical principles or electronic principles, and can be self-excited or use an external power source. 3.1.3
Detection element sensor
A component of a water meter that is directly affected by a phenomenon, medium, or object that is being measured. Note 1. Rewrite ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 3.8. Change the "measurement system" to "water meter". Note 2. The detection elements of the water meter can be discs, pistons, gears, turbines, electrodes in electromagnetic water meters or other components. Water flow through the water meter is detected in the water meter The quantity or volume of water is referred to as a "flow detecting element" or a "volume detecting element." 3.1.4
Calculator calculator
A water meter component that receives the output signal of a measurement sensor or associated measurement instrument and converts it into a measurement result. If conditions permit, Measurement results can also be stored in memory before they are used.
Note 1. The gear transmission in the mechanical water meter can be regarded as a calculator. Note 2. The calculator can also communicate bidirectionally with the auxiliary device. 3.1.5
Indicating device
A water meter component that corresponds to the indicated volume of water flowing through the water meter is given. Note. The term “indicative value” is defined in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 4.1. 3.1.6
Adjustment device adjustmentdevice
The water meter can be adjusted in the water meter to make the error curve of the water meter parallel to the device within the maximum allowable error range. Note. The term “measurement system adjustment” is defined in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 3.11. 3.1.7
Correction device correctiondevice
Connected or installed in a water meter, automatically under the measurement conditions based on the flow rate and/or characteristics of the water being measured and a predetermined calibration curve A device that corrects the volume.
Note 1. The characteristics of the water to be measured (such as temperature and pressure) can be measured with the relevant measuring instrument or stored in the instrument's memory. Note 2. The definition of the term “correction” can be found in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 2.53. 3.1.8
Auxiliary device
A device that performs a specific function and is directly involved in generating, transmitting, or displaying measured values. Note 1. The definition of “measured value” can be found in ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), 2.10. Note 2. There are mainly the following auxiliary devices.
a) zero adjustment device;
b) price indicating device;
c) repeating the indicating device;
d) printing device;
e) storage device;
f) rate control device;
g) a preset device;
h) self-service devices;
i) a flow detecting element moving detector (detecting the movement of the flow detecting element before the indicating device is displayed); j) Remote meter reading device (can be installed permanently or temporarily). Note 3. According to national laws and regulations, auxiliary devices may be subject to legal measurement management. 3.1.9
Rate control device
A device that assigns measured values to different registers according to rates or other criteria. Each register can be read separately. 3.1.10
Preset device pre-settingdevice
A device that allows the selection of water usage and automatically stops the flow of water after the selected amount of water has been measured. 3.1.11
Related measuring instrument associatedmeasuringinstruments
A meter attached to a calculator or correction device for measuring a certain amount of water for correction and/or conversion. 3.1.12
Fixed customer water meter meterfortwoconstantpartners
Only for a fixed installation of water meters that a supplier supplies to a customer. 3.1.13
Pipeline water meter in-linemeter
A water meter that accesses a closed pipe using a connector at the end of the water meter. Note. The end connector can be flanged or threaded.
Integral water meter completemeter
Measuring instruments, calculators, and water meters that are inseparable from the pointing device. 3.1.15
Split type water meter combinedmeter
A water meter that separates the measuring sensor, calculator, and pointing device. 3.1.16
Duplex water meter combinationmeter
A water meter consisting of a large water meter, a small water meter and a conversion device. The conversion device according to the flow rate flowing through the water meter Automatically directs water flow through a small or large water meter, or both water meters. Note. The reading of the water meter is read from two independent totalizers, or the total flow value of the two water meters is added by an accumulator. 3.1.17
Test equipment equipmentundertest; EUT
A complete water meter, water meter assembly or auxiliary device that is tested. 3.1.18
Coaxial water meter concentricmeter
A water meter that uses a manifold to access a closed conduit.
Note. The inlet and outlet channels of the water meter and manifold are coaxial at the junction between the two. 3.1.19
Coaxial water meter collection tube concentricmetermanifold
Special connection pipe fittings for coaxial water meters.
Cartridge water meter cartridgemeter
A water meter that accesses a closed conduit using a transition piece called a connection interface. Note. The inlet and outlet channels of the water meter and connection interface are coaxial or axial. See GB/T 778.4 for details. 3.1.21
Cartridge water meter connection interface cartridgemeterconnectioninterface Special connection fittings for coaxial or axial cartridge water meters. 3.1.22
Interchangeable metering module water meter meterwithexchangeablemetrologicalmodule The common flow rate is above 16m3/h, which consists of a connection interface and a metering module. The metering module can be used with other models of the same model. Block interchangeable water meters.
Interchangeable metering module exchageablemetrologicalmodule
A separate module consisting of a measuring sensor, a calculator and a pointing device. 3.1.24
Interchangeable metering module water meter connection interface connectioninterfaceformeterswithexchangeablemetrological Modules
Special connection fittings for interchangeable metering modules.
3.2 Measurement characteristics
Actual volume actualvolume
The total volume of water flowing through the water meter at any time.
Note 1. This is measured.
Note 2. The actual volume is calculated from the reference volume. The reference volume is determined by using appropriate measurement standards in consideration of various measurement conditions. Fixed.
Indicate volume indicatedvolume
Corresponds to the actual volume, the volume of water displayed by the water meter. 3.2.3
Main indication value primaryindication
The value of the legal system management.
Error error
The measured value is subtracted from the reference value.
[ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), Definition 2.16]
Note 1. For this part, the indicated volume is the measured value and the actual volume is the reference value. The difference between the indicated volume and the actual volume is. (indicator) error. Note 2. In this section, the (indicator) error is expressed as a percentage of the actual volume, ie. (Vi-Va)/Va×100%
Maximum allowable error maximumpermissibleerror; MPE
The limit value of the measurement error relative to the known reference magnitude, as permitted by the specification or procedure of the water meter. Note. Modify ISO /IEC Guide 99.2007/OIMLV2-200.2012 (VIM), definition 4.26. Replace “measurement, measuring instrument or measuring system” with “water meter” System."
Basic error intrinsicerror
The error of the water meter determined under the reference conditions. Note. Modify OIMLD11.2013, definition 3.8. Replace the “measurement meter” with “water meter”. 3.2.7
Initial basic error initialintrinsicerror
The basic error of the water meter determined prior to the performance test and durability evaluation test. Note. Modify OIMLD11.2013, definition 3.9. Replace the “measurement meter” with “water meter”. 3.2.8
Error fault
The difference between the (indicative) error of the water meter and the basic error. Note. Modify OIMLD11.2013, definition 3.10. “Indicative value” is placed in parentheses; “water meter” is used instead of “measurement meter”. 3.2.9
Obvious error significantfault
An error greater than the value specified in GB/T 778.1.
Note 1. Modify OIMLD11.2013, definition 3.12. Replace “related international recommendations” with “GB/T 778.1”. Note 2. The specified value is given in 5.1.2.
The ability of a water meter to maintain its performance characteristics after a period of use. Note. Modify OIMLD11.2013, definition 3.18. Replace the “measurement meter” with “water meter”. 3.2.11
Measuring condition
The conditions of the water to be measured at the measurement point (for example, water temperature, water pressure, etc.). 3.2.12
Indicating device primary element firstelementoftheindictingdevice
An indicator device consisting of a plurality of components is provided with an element for calibrating the scale division scale. 3.2.13
Verification scale division verificationscaleinterval
Indicates the minimum index of the primary component of the device.
Display resolution of the device resolutionofandisplayin...

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