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Program of Pattern Evaluation of Cold Potable Water Meters
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JJF 1777-2019
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Basic data | Standard ID | JJF 1777-2019 (JJF1777-2019) | | Description (Translated English) | Program of Pattern Evaluation of Cold Potable Water Meters | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A52 | | Classification of International Standard | 17.120 | | Word Count Estimation | 204,266 | | Date of Issue | 2019 | | Date of Implementation | 2020-03-31 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1777-2019: Program of Pattern Evaluation of Cold Potable Water Meters---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Outline of type evaluation of drinking cold water meter)
National Metrology Technical Specifications of the People's Republic of China
Evaluation outline for drinking cold water meter type
2019-12-31 released
2020-03-31 Implementation
Issued by the State Administration for Market Regulation
Drinking cold water phenotype
Syllabus
Replace JJG162-2009
Type evaluation part
Central unit. National Flow Measurement Technical Committee Liquid Flow Sub-Technical Committee
Main drafting unit. Zhejiang Institute of Metrology
Beijing Institute of Metrology and Testing
Participated in the drafting. Shandong Institute of Metrology
Henan Institute of Metrology
Ningbo Water Meter Co., Ltd.
Sanchuan Wisdom Technology Co., Ltd.
This specification entrusts the National Flow Measurement Technical Committee Liquid Flow Sub-Technical Committee to be responsible for the interpretation
The main drafters of this outline.
Jianliang Zhao (Zhejiang Institute of Metrology)
Li Chen (Beijing Institute of Metrology and Testing Science)
Participating drafters.
Zhang Wuduo (Shandong Institute of Metrology)
Hu Bo (Henan Institute of Metrology)
Zhao Shaoman (Ningbo Water Meter Co., Ltd.)
Song Caihua (Sanchuan Wisdom Technology Co., Ltd.)
table of Contents
Introduction (Ⅲ)
1 scope (1)
2 Reference documents (1)
3 Term (3)
3.1 Water meter and its components (3)
3.2 Metrological characteristics (5)
3.3 Working conditions (7)
3.4 Test conditions (8)
3.5 Electronic and electrical equipment(9)
4 Overview (11)
4.1 Principle and structure composition (11)
4.2 Classification (11)
4.3 Key parts and materials of water meters (11)
5 Legal management requirements (13)
5.1 Unit of measurement (13)
5.2 External structure(13)
5.3 Signs (13)
5.4 Sealing and protection (14)
6 Measurement performance requirements (15)
6.1 Flow characteristics of water meters (15)
6.2 Accuracy level and maximum allowable error (16)
6.3 Indication error curve(17)
6.4 Repeatability (17)
6.5 Interchange error(17)
6.6 Reverse flow (17)
6.7 Water temperature (17)
6.8 Water pressure (17)
6.9 Overload water temperature (17)
6.10 No flow or no water (17)
6.11 Other requirements for water meters and auxiliary devices (18)
6.12 Static magnetic field(19)
6.13 Durability (19)
7 General technical requirements (20)
7.1 Rated working conditions of water meters (20)
7.2 Material and structure of water meter (20)
7.3 Indicating device(21)
7.4 Installation conditions (23)
7.5 Static pressure (24)
7.6 Pressure loss (24)
7.7 Water meter with electronic device (25)
8 Type evaluation item list (28)
9 Provide the number of prototypes and how to use the prototypes (31)
9.1 Feature recognition of water meters (31)
9.2 Confirmation of prototype (31)
9.3 How to use the prototype (32)
10 Test methods and conditions of test items, data processing and qualification criteria (32)
10.1 Test conditions (32)
10.2 Indicating device inspection (33)
10.3 Inherent error test (36)
10.4 Interchange error test of plug-in water meter and water meter with interchangeable metering module (43)
10.5 Reverse flow test (44)
10.6 Water temperature test (45)
10.7 Hydraulic test (46)
10.8 Overload water temperature test (46)
10.9 No flow or no water test (47)
10.10 Test of auxiliary device of water meter (47)
10.11 Static magnetic field test (48)
10.12 Durability test (49)
10.13 Flow disturbance test (54)
10.14 Static pressure test (57)
10.15 Pressure loss test (57)
10.16 Performance test related to impact factor and disturbance (61)
11 Table of measuring instruments used in test items (86)
Appendix A Requirements for inspection devices and their type inspections and tests (88)
Appendix B Indication Error and Repeatability Calculation of Water Meter (95)
Appendix C Error Test of Electromechanical Conversion (99)
Appendix D Prototype Selection of Series Water Meters (101)
Appendix E Flow Disturbance (103)
Appendix F Examples of methods and components for testing coaxial water meters (114)
Appendix G Density of water (117)
Appendix H Details of pressure loss test pressure ports, pressure holes and slots (119)
Appendix J Impact Factor and Maximum Uncertainty of Disturbance Measurement (121)
Appendix K Type Evaluation Test Report Format (123)
Introduction
This outline is compiled in accordance with the relevant regulations of JJF 1015-2014 and JJF 1016-2014.
This outline is revised on the principle of technical equivalence and adopts the international recommendations issued by the International Organization for Legal Metrology (OIML)
OIMLR49-1.2013, OIMLR49-2.2013 and OIMLR49-3.2013, combined with my country on this basis
The characteristics of the existing water meter types have been refined for the specific types of mechanical water meters with electronic devices such as prepaid and remote transmission.
Claim. These specific requirements are integrated with the corresponding requirements of OIMLR49, so that this syllabus is maintained with OIMLR49
Improved overall compatibility. In order to maintain the corresponding relationship with OIMLR49, this outline retains the nominal diameter above DN50
The relevant content of the water meter can be used as a reference for performance test.
Compared with Appendix A of the previous version of the JJG162-2009 Type Evaluation Outline, in addition to the major changes in the format
The main technical content changes are as follows.
--- Adjusted the scope of application of the outline.
---The minimum value of Q3/Q1 is increased from 10 to 40.
--- The accuracy level 1 water meter is only applicable to the limit of Q3≥100m3/h.
---Nominal diameter DN50 and above or Q3 >16m3/h water meter Q2/Q1 optional 2.5, 4 or 6.3
Provisions.
---Added repetitive requirements.
---Added specific requirements for adjustment devices and correction devices.
---Increase the interchange error requirements and test methods of plug-in water meters and interchangeable metering modules.
---Increase the technical requirements and test methods for the overload water temperature of the temperature grade T50 water meter.
---Combined with JJF 1015-2014 on the definition of series products, the confirmation principle of series water meters has been expanded.
---Adjusted the sequence of the durability test of the Q3≤16m3/h water meter, the intermittent flow durability test precedes the continuous
Flow durability test. Q3 >16m3/h water meter adds the 800h continuous flow durability test requirement under Q3.
---Deleted the technical requirements and test methods for shell protection and auxiliary device life.
---Increase the type inspection and test method of the inspection device (Appendix A).
---The type evaluation check and test list is deleted in the appendix.
---The type evaluation test report format (Appendix K) has been added to the appendix.
---Combined with the provisions of JJF 1016-2014, the key components and material description requirements of the water meter have been added.
---Combined with the regulations of JJF 1015-2014, the regulations on prototype handling after the end of the type evaluation have been added.
The release status of previous versions of this outline.
---JJG162-2009 "Cold Water Meter" Appendix A;
---JJG162-2007 "Cold Water Meter" Appendix A.
Evaluation outline for drinking cold water meter type
1 Scope
This outline is applicable to the classification code of measuring instruments as 12200500, with a nominal diameter not greater than 50mm, drinking cold water meters
Type evaluation.
This outline does not apply to water meters that measure non-potable cold water.
2 Reference documents
JJG162-2019 Cold drinking water meter
JJF 1059.1 Evaluation and expression of measurement uncertainty
GB/T 2421.1 Overview and Guidelines for Environmental Testing of Electrical and Electronic Products (IEC 60068-1Environmental
testing-Part 1.Generalandguidance,IDT)
GB/T 2423.1 Environmental testing of electric and electronic products Part 2.Test method Test A. Low temperature
(IEC 60068-2-1Environmentaltesting-Part 2.Tests-TestA.Cold,IDT)
GB/T 2423.2 Environmental testing of electrical and electronic products Part 2.Test method Test B. High temperature
(IEC 60068-2-2Environmentaltesting-Part 2.Tests-TestB.Dryheat,IDT)
GB/T 2423.4 Environmental testing of electrical and electronic products Part 2.Test method Test Db. Alternating humidity
Heat (12h 12h cycle) (IEC 60068-2-30Environmentaltesting-Part 2-30.Tests-Test
Db. Dampheat, cyclic(12h 12hcycle), IDT)
GB/T 2423.7 Environmental Test Part 2.Test Method Test Ec Impact caused by rough operation
(Mainly used for equipment type samples) (IEC 60068-2-31Environmentaltesting-Part 231.Rough
handlingshocks,primarilyforequipment-typespecimens,IDT)
GB/T 2423.43 Environmental testing of electrical and electronic products Part 2.Test methods Vibration, shock and class
Installation of similar kinetic test samples (IEC 60068-2-47Environmentaltesting-Part 2-47.Test
methods-Mountingofspecimensforvibration, impactandsimilardynamictests, IDT)
GB/T 2423.56 Environmental Test Part 2.Test Method Test Fh. Broadband Random Vibration and Guidelines
(IEC 60068-2-64Environmentaltest-Part 2-64.Tests-TestFh.Vibration,broad-
bandrandomandguidance, IDT)
GB/T 2424.1 Environmental Test Part 3.Supporting Documents and Guidelines Low and High Temperature Test
(IEC 60068-3-1Environmentaltesting-Part 3-1.Supportingdocumentationandguid-
ance-Coldanddryheattests, IDT)
GB/T 2424.2 Electrical and electronic products environmental test damp heat test guide (IEC 60068-3-4Environ-
mentaltesting-Part 3-4.Supportingdocumentationandguidance-Dampheattests,
IDT)
GB/T 17214.2 Working conditions of industrial process measurement and control devices Part 2.Power
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