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Basic data
| Standard ID | CJ/T 434-2013 (CJ/T434-2013) |
| Description (Translated English) | Ultrasonic water meter |
| Sector / Industry | Urban Construction Industry Standard (Recommended) |
| Classification of Chinese Standard | P47 |
| Classification of International Standard | 91.140 |
| Word Count Estimation | 20,229 |
| Quoted Standard | GB/T 191; GB/T 778.1-2007; GB/T 778.3-2007; GB/T 2423.1; GB/T 2423.8; GB 4208; GB 4706.1; GB/T 5080.7-1986; GB/T 13384; GB/T 15479-1995; GB/T 26831; JB/T 9329 |
| Regulation (derived from) | Announcement of the Ministry of Housing and Urban-Rural Development No. 68; industry standard filing Notice 2013 No. 8 (No. 164 overall) |
| Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China |
| Summary | This standard specifies: Ultrasonic water meter terms and definitions, structure and classification, measurement requirements, technical requirements, test methods, inspection rules, marking, packaging, transport and storage requirements. This standard ap |
CJ/T 434-2013: Ultrasonic water meter
---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.
Ultrasonic water meter
ICS 91.140
P47
The People's Republic of China Urban Construction Industry Standard
Ultrasonic water meter
Released on.2013-06-25
2013-12-01 implementation
Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Structure and classification 2
5 Measurement requirements 2
6 Technical requirements 4
7 Test method 7
8 Inspection rules 11
9 Marking, packaging, transportation and storage 12
Appendix A (Normative appendix) Accuracy rating at the factory 14
Appendix B (Normative Appendix) Repeatability Assessment 16
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Standard Rating Institute of the Ministry of Housing and Urban-Rural Development.
This standard is under the jurisdiction of the Technical Committee of Water Supply and Drainage Products Standardization of the Ministry of Housing and Urban-Rural Development.
The organization responsible for drafting this standard. Hefei Dibey Instrument Technology Development Co., Ltd., Shenzhen Huaxu Technology Development Co., Ltd.
Participated in the drafting of this standard. Hefei Rena Meter Co., Ltd., Hunan Weiming Energy Technology Co., Ltd., Beijing Kangdeman Electronic Technology
Co., Ltd., Xi'an Jingqi Electronics Co., Ltd., Beijing Times Minxin Technology Co., Ltd.
The main drafters of this standard. Jiang Yuewei, Xue Mingxing, Cao Shilai, Xiong Jinhua, Yu Dayong, Huang Shenxi, Pan Weimin, Chen Hongbo, Jiang Anping,
Gao Jie, Li Guangchun.
Ultrasonic water meter
1 Scope
This standard specifies the terms and definitions, structure and classification, measurement requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements of ultrasonic water meters.
This standard applies to the use of ultrasonic time difference method for flow measurement, and meets the requirements of GB/T 778.1-2007, GB/T 778.3-2007 cold water meter and hot water meter.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 191 Packaging, storage and transportation pictorial signs
GB/T 778.1-2007 Measurement of water flow in closed full pipelines. Cold drinking water meters and hot water meters Part 1.Specification
GB/T 778.3-2007 Measurement of water flow in closed full pipelines. Cold drinking water meters and hot water meters. Part 3.Test methods and test equipment
GB/T 2423.1 Environmental testing of electric and electronic products Part 2.Test method Test A. Low temperature
GB/T 2423.8 Environmental testing of electric and electronic products Part 2.Test method Test Ed. Free fall
GB 4208 Shell protection grade (IP code)
GB 4706.1 Safety of household and similar electrical appliances Part 1.General requirements
GB/T 5080.7-1986 Equipment Reliability Test The verification test plan for failure rate and mean time between failures under the assumption of constant failure rate
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 15479-1995 Technical requirements and test methods for insulation resistance and insulation strength of industrial automation instruments
GB/T 26831 Community Energy Metering and Collecting System Specification
JB/T 9329 Basic environmental conditions and test methods for transportation and storage of instruments and meters
3 Terms and definitions
The following terms and definitions defined in GB/T 778.1-2007 and GB/T 778.3-2007 apply to this document.
3.1
Utilize the principle of ultrasonic flow measurement to measure, store and display the instantaneous and accumulated flow of water under rated working conditions.
3.2
Soundtrack
Ultrasonic propagation path.
3.3
Vocal tract angle
The angle between the ultrasonic propagation path and the pipe axis.
3.4
Velocity distribution coefficient
The ratio of the average linear velocity of the fluid in the axial direction to the average velocity of the measured cross section.
3.5
Ultrasonic water meter with inseparable measuring sensor and calculator.
3.6
Ultrasonic water meter with separate measuring sensor and calculator.
3.7
Ultrasonic transducer
A device that can produce ultrasonic signal output under electrical signal excitation and convert ultrasonic signal into electrical signal.
3.8
Mono ultrasonic water meter
An ultrasonic water meter with only a pair of ultrasonic transducers.
3.9
Multi-channel ultrasonic water meter
An ultrasonic water meter with two or more pairs of ultrasonic transducers.
3.10
The sampling period
The time interval between two adjacent water velocity measurements.
3.11
Body
Specially manufactured, a standard pipe section integrating ultrasonic transducers and other measuring components.
4 Structure and classification
4.1 Structure
The structure of the ultrasonic water meter is integral or split.
4.2 Classification
4.2.1 The classification according to the applicable installation environment is as follows.
a) Class B. Fixed installation indoors;
b) Class C. Fixed installation outdoors.
4.2.2 The classification according to the electromagnetic environment is as follows.
a) E1 level. residential, commercial and light industry;
b) E2 level. industrial.
5 Measurement requirements
5.1 Measurement principle
Ultrasonic water meters should adopt the time difference method for flow measurement. The time difference method uses the time td of the ultrasonic pulse to travel downstream in the fluid
The difference between the propagation time tu and the countercurrent propagation time tu is used to measure the fluid velocity, thereby calculating the fluid flow in the pipeline. The basic measurement principle is shown in Figure 1.
5.2 Metrological characteristics
Should comply with the provisions of 5.1 in GB/T 778.1-2007, and Q3/Q1 should not be less than 125.
5.3 Maximum allowable error
It should meet the requirements of 5.2 in GB/T 778.1-2007, and the maximum allowable error in the low zone and the maximum allowable error in the high zone should meet the following regulations.
a) When the water temperature is within the specified range of the rated working conditions, the maximum volume discharged at the flow rate between Q1 and Q2 (not including Q2)
The allowable error, according to the accuracy level, should meet the maximum allowable error in the low area of Table 1;
b) When the water temperature is within the specified range of the rated working conditions, the maximum allowable error of the volume discharged at the flow rate between Q2 (including Q2) and Q4,
According to the accuracy level, it should meet the maximum allowable error of the high zone in Table 1.
5.4 Repeatability error
It should not be greater than 1/3 of the absolute value of the maximum allowable error value given in Table 1.
5.5 Zero flow reading
It shall meet the requirements of 5.3 of GB/T 778.1-2007.
5.6 Rated operating conditions (ROC)
It shall meet the requirements of 5.4 in GB/T 778.1-2007.
5.7 Other requirements
It shall meet the requirements of 5.6 in GB/T 778.1-2007.
6 Technical requirements
6.1 Visual inspection requirements
6.1.1 Appearance
It should have a good surface treatment, free of burrs, scratches, cracks, rust, mildew and coating peeling. The protective cover on the display device should have
Good transparency, no distortion of the reading and other defects that hinder the reading.
6.1.2 Electronic seal
It shall meet the requirements of 6.5 in GB/T 778.1-2007.
6.1.3 Material and structure
It shall meet the requirements of 6.1 of GB/T 778.1-2007.
6.1.4 Verification marks and protective devices
It shall meet the requirements of 6.4 in GB/T 778.1-2007.
6.2 Technical characteristics
6.2.1 Caliber and overall dimensions
It shall meet the requirements of 4.1.1 in GB/T 778.1-2007.
6.2.2 Threaded connection
It shall meet the requirements of 4.1.2 in GB/T 778.1-2007.
6.2.3 Flange connection
It shall meet the requirements of 4.1.3 in GB/T 778.1-2007.
6.3 Display device
6.3.1 Display content
The display unit of the current flow rate should be m3/h, and the display unit of the accumulated volume should be m3.The visible height of the displayed number should not be small
At 4mm. The decimal part of the displayed value should be clearly distinguishable from the other parts of the value. The displayed value and unit should be clearly marked,
clear. When using multi-screen display, the value displayed on each screen should be complete.
6.3.2 Display resolution
When in use, the display resolution should not be lower than the provisions of Table 2.
6.3.3 Display range
The display range should not be lower than that specified in Table 3.
6.3.4 Fault prompt
When the power supply is undervoltage, the ultrasonic transducer is faulty, or the liquid in the pipeline is not full (or empty), it should be clearly displayed.
Fault prompt information.
6.4 Maximum allowable working pressure
It shall meet the requirements of 5.4.2 in GB/T 778.1-2007.
6.5 Pressure loss
The maximum pressure loss under rated working conditions should not exceed 0.04MPa.
6.6 Power requirements
It shall meet the requirements of 6.7.4 in GB/T 778.1-2007.For ultrasonic water meters with nominal diameter DN not greater than 40mm,
It adopts built-in battery for power supply, and the service life of the battery should not be less than 61 years.
6.7 Safety requirements
6.7.1 Power-off data protection
When the power supply stops supplying power, it should be able to save the accumulated volume recorded before the power failure, the corresponding time mark and the data in 6.9, and restore the supply.
It should be able to automatically restore normal metering functions after electricity.
6.7.2 Electrical insulation
Should meet the requirements of GB 4706.1.
6.7.3 Enclosure protection class
The classification of the enclosure protection level shall be carried out in accordance with the provisions of GB 4208, and shall meet the provisions of IP65; for water that may be
Table, should meet the requirements of IP68.
6.8 Durability
Should meet the provisions of 6.2 of GB/T 778.1-2007, the maximum allowable error should meet the provisions of 5.3.
6.9 Data storage
6.9.1 Historical measurement data
It should be able to store the cumulative volume data of the last 24 months and the corresponding time stamp.
6.9.2 Event Record
The ultrasonic water meter should be able to record at least the following events and the corresponding time marks in the running state.
a) Power failure or built-in battery undervoltage;
b) Failure of ultrasonic transducer;
c) The water flow in the pipe section is not full (or empty pipe);
d) Reverse flow of water in the pipe section (for water meters with irreversible flow measurement);
e) The current flow is greater than Q4 or less than Q1;
f) The water temperature exceeds the temperature range of the water meter.
6.10 Data communication
The cumulative volume of the water meter, the current flow rate and the data storage content specified in 6.9 should be able to be read out through data communication, communication interface and protocol
Should comply with the relevant regulations of GB/T 26831.When the communication interface voltage is greater than 36V, the insulation resistance and insulation strength of the ultrasonic water meter should be
Comply with the provisions of Chapter 4 of GB/T 15479-1995.
6.11 Weather resistance
In low temperature, high temperature, circulating damp heat and low temperature storage environment, the ultrasonic water meter should not be damaged or lose data information.
6.12 Electromagnetic compatibility
In the environment of electrostatic discharge, electromagnetic field, static magnetic field, electrical fast transient pulse group and electrical surge, the ultrasonic water meter should not be damaged or lose data information.
6.13 Reliability
Under rated working conditions, the mean time between failures (MTBF) should not be less than 30000h.
6.14 Transport shock and drop resistance
Under the condition of transportation and packaging, the water meter should not be damaged or lose information after the continuous impact and free drop test of simulated transportation specified by JB/T 9329, and can work normally.
7 Test method
7.1 Test requirements
7.1.1 General test requirements
Should comply with the provisions of Chapter 4 in GB/T 778.3-2007.
7.1.2 Test device
It should be able to meet the metrological characteristics of the instrument under test, and the measurement uncertainty of the test device should not be greater than 1/5 of the error limit of the instrument under test.
7.2 Visual inspection
Use visual inspection and conventional inspection tools to check the appearance of the ultrasonic water meter, and it should meet the requirements of 6.1.
7.3 Technical characteristics inspection
Use visual inspection and conventional inspection tools to check the technical characteristics of the ultrasonic water meter, which should meet the requirements of 6.2.
7.4 Display device inspection
Use visual inspection and conventional inspection tools to check the display device of the ultrasonic water meter, which should meet the requirements of 6.3.
7.5 Measurement accuracy test
7.5.1 Basic indication error test
The factory inspection shall be carried out in accordance with the provisions of Appendix A, and the type inspection shall be carried out in accordance with the provisions of 5.8 in GB/T 778.3-2007, and shall comply with the provisions of 5.3.
7.5.2 Water temperature influence test
Carry out in accordance with the provisions of 5.9 in GB/T 778.3-2007, and should comply with the provisions of 5.3.
7.5.3 Pressure influence test
According to the provisions of 5.10 in GB/T 778.3-2007, and should meet the provisions of 5.3.
7.5.4 Countercurrent test
According to the provisions of 5.11 in GB/T 778.3-2007, and should meet the provisions of 5.3.
7.6 Measurement repeatability test
Follow the provisions of Appendix B.
7.7 Zero flow reading test
Keep the water pressure and water temperature in the measuring pipe section stable and the water flow is zero, observe and record the water meter reading for 2 minutes, which should meet the requirements of 5.5.
7.8 Static pressure test
The factory inspection shall be carried out in accordance with the provisions of 11.2 in GB/T 778.3-2007, and the type inspection shall be carried out in accordance with the provisions of Chapter 6 in GB/T 778.3-2007, and shall comply with the provisions of 6.4.
7.9 Pressure loss test
According to the provisions of Chapter 7 of GB/T 778.3-2007, and should meet the provisions of 6.5.
7.10 Power test
7.10.1 Battery working life test
Install the ultrasonic water meter on the test bench to make it run normally under Q3, and the water temperature is room temperature. Use oscilloscope to measure power supply current
The curve, the time is not less than 10 complete sampling cycles, and the power supply current is calculated based on 80% of the battery's rated capacity value as reference data
The effective value and the corresponding battery usage time should meet the requirements of 6.6.
7.10.2 Battery undervoltage monitoring function test
Use an adjustable DC stabilized power supply to replace the power supply battery, and slowly decrease the supply voltage from the normal working voltage.
If it is greater than 0.1V, the time interval between the two downward adjustments is not less than 1min. The test block diagram is shown in Figure 2.Observe whether the ultrasonic water meter can display the battery undervoltage prompt information normally.
Figure 2 Block diagram of battery undervoltage monitoring test
7.10.3 AC power test
When the ultrasonic water meter uses an external AC power source, an AC power source fluctuation test is required, according to the provisions of 9.5.1 in GB/T 778.3-2007.
7.10.4 DC power supply test
When the ultrasonic water meter uses an external DC power supply, a DC power supply fluctuation test is required, according to the provisions of 9.5.5 in GB/T 778.3-2007.
7.11 Safety requirements test
7.11.1 Power-off data protection test
Interrupt the power supply of the ultrasonic water meter, the interruption time is greater than 1min, the interval of 2 consecutive interruptions is greater than 1min, and it will be restored after 5 times
The power supply of the ultrasonic water meter and the data before and after the test shall meet the requirements of 6.7.1.
7.11.2 Electrical insulation test
According to the provisions of GB 4706.1, and should meet the provisions of 6.7.2.
7.11.3 Shell protection test
According to the provisions of Chapter 11, Chapter 12, Chapter 13, Chapter 14 and Chapter 15 in GB 4208-2008, and should meet the requirements of 6.7.3.
7.12 Durability test
According to the provisions of Chapter 8 of GB/T 778.3-2007, and should meet the provisions of 6.8.
7.13 Data storage test
7.13.1 Historical measurement data storage test
Using the method of changing the water meter clock, simulating 24 months of operation, checking the content of historical measurement data, it should meet the requirements of 6.9.1.
7.13.2 Event recording experiment
Simulate a water meter operation event, check the content of the event record, and it should meet the requirements of 6.9.2.
7.14 Data communication test
The communication mode of the water meter configuration to read data should meet the requirements of 6.10.When the communication interface voltage is higher than 36V, press
GB/T 15479-1995 Chapter 5 provides insulation resistance and insulation strength tests.
7.15 Climate environment test
7.15.1 High temperature
It should be carried out in accordance with the provisions of 9.3.1 in GB/T 778.3-2007, and should comply with the provisions of 6.11.
7.15.2 Low temperature
It should be carried out in accordance with the provisions of 9.3.2 in GB/T 778.3-2007, and should comply with the provisions of 6.11.
7.15.3 Alternating heat and humidity
It should be carried out in accordance with the provisions of 9.3.3 in GB/T 778.3-2007, and should comply with the provisions of 6.11.
7.15.4 Low temperature storage
According to the provisions of Table 4 and related standards, and should meet the provisions of 6.11.
7.16 Electromagnetic compatibility experiment
7.16.1 Electrostatic discharge
It should be carried out in accordance with the provisions of 9.4.1 in GB/T 778.3-2007, and should comply with the provisions of 6.12.
7.16.2 Electromagnetic susceptibility
According to the provisions of 9.4.2 of GB/T 778.3-2007, and should meet the provisions of 6.12.
7.16.3 Static magnetic field
It should be carried out in accordance with the provisions of 9.4.3 in GB/T 778.3-2007, and should comply with the provisions of 6.12.
7.16.4 Electrical fast transient burst
According to the provisions of 9.5.4 in GB/T 778.3-2007, and should meet the provisions of 6.12.
7.16.5 Electric surge
According to the provisions of 9.5.3 in GB/T 778.3-2007, and should meet the provisions of 6.12.
7.17 Reliability test
Select GB/T 5080.7-1986 table 12 timed (fixed number) censoring test plan 5.9, and should meet the requirements of 6.13.
7.18 Transport shock and drop performance test
7.18.1 Continuous impact test
Carry out under the conditions of transport packaging according to the provisions of JB/T 9329, and should comply with the provisions of 6.14.
7.18.2 Free drop test
Carry out in accordance with the provisions of GB/T 2423.8 under the conditions of transport packaging, and should meet the provisions of 6.14.
8 Inspection rules
8.1 Inspection classification
Inspection is divided into factory inspection and type inspection.
8.1.1 Factory inspection
Ultrasonic water meters should be inspected one by one before they leave the factory.
8.1.2 Type inspection
Ultrasonic water meters should undergo type inspection in the following situations.
a) New product design finalization appraisal and batch trial production finalization appraisal;
b) When production materials, processes and product structure change;
c) When production resumes after 1 year of suspension;
d) When relevant regulations require a type inspection.
8.2 Inspection items
The inspection items of factory inspection and type inspection shall be implemented in accordance with Table 5.
8.3 Inspection quantity
The factory inspection shall be carried out on a table by table; the number of samples tested for the type inspection shall be selected according to the provisions of 10.1 in GB/T 778.3-2007.
9 Marking, packaging, transportation and storage
9.1 Logo
The following information should be clearly and permanently marked on the housing, nameplate or cover of the water meter that cannot be separated from the meter body.
a) Unit of measurement. cubic meter or m3;
b) Measurement accuracy level. if it is not level 2, it should be marked;
c) Q3 value, Q3/Q1 value;
d) The mark and number of the license for manufacturing measuring instruments;
e) The name or trademark of the manufacturer;
f) Manufacturing year and serial number;
g) Flow direction (marked on one or both sides of the pipeline, it should be easy to see the flow direction indicator arrow under any circumstances);
h) The temperature class, if it is not T30, should be marked;
i) The maximum allowable pressure, if it exceeds 1MPa, or for the nominal diameter not less than 500mm, it exceeds 0.6MPa;
j) External power supply. voltage and frequency;
k) Replaceable battery. the deadline for battery replacement;
l) Non-replaceable battery. The deadline for the water meter to be replaced.
9.2 Packaging
It should meet the requirements of GB/T 13384, and the graphic mark should meet the requirements of GB/T 191.
9.3 Transportation
It should comply with the regulations of JB/T 9329.It should be placed upwards according to the sign during transportation. It should not be directly affected by rain, frost,
Damage such as impact.
9.4 Storage
9.4.1 The product cushion should not be less than 0.1m from the ground, not less than 1m from the four walls, and not less than 2m from the heating equipment.
9.4.2 The environmental conditions of the warehouse shall meet the following requirements.
Environmental Category B. -25℃~ 55℃;
Environmental Category C. 5℃~ 55℃;
Relative humidity. < 80%;
There should be no acid, alkali, flammable, explosive, toxic and corrosive items in the warehouse. Should prevent strong electromagnetic field and direct sunlight.
9.4.3 Storage time
The storage time should not exceed 6 months, and the factory inspection should be repeated after 6 months.
Appendix A
(Normative appendix)
Accuracy rating at the factory
A.1 Flow standard device
A.1.1 The flow standard device should meet the requirements of 7.1.2.
A.1.2 When testing, the front and back pipes of the ultrasonic water meter should be straight pipes, and the length of the straight pipes should be in accordance with the requirements of the tested ultrasonic water meter.
A.2 Environmental conditions
a) Indoor temperature. 15℃~35℃;
b) Relative humidity. 25%~75%;
c) Atmospheric pressure. 86kPa~106kPa.
A.3 Test water temperature
According to the temperature grade of the test water meter, determine the test water temperature according to Table A.1, and the temperature deviation range is ±5℃.
Appendix B
(Normative appendix)
Repeatability assessment
B.1 Flow standard device
The flow standard device shall meet the requirements of A.1.
B.2 Environmental conditions
The environmental conditions should meet the requirements of A.2.
B.3 Test water temperature
The test water temperature is selected according to the requirements of A.3.
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