This regulation applies to the type evaluation, prototype test, initial verification, subsequent verification and in-use inspection of flow totalizers (hereinafter referred to as totalizers). JJG 1003-2005 Verification Regulation for Flow Totalizers JJG1003-2005 Standard download decompression password: www.bzxz.net
This regulation applies to the type evaluation, prototype test, initial verification, subsequent verification and in-use inspection of flow totalizers.

National Verification Regulation of Metrology of the People's Republic of China JJG 1003—2005
Flow Intergration Meters
2005-09-05 Issued
Implementation from 2005 to December 5
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJG 1003—2005
Verification Regulation of Flow Intergration Meters
JJG 1003--2005
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 5, 2005, and came into effect on December 5, 2005.
Responsible unit:
Main drafting unit:
Participating drafting unit:
National Technical Committee for Flow Capacity Measurement
Henan Planning and Reclamation Science Research Institute
Zhengzhou Gas Corporation
Henan Oriental Gas Co., Ltd.
Xu Lunengxin Heating Co., Ltd.
Jinzhou Kerui Automation Instrument Co., Ltd.
Beijing Bosda Measurement and Control Instrument Co., Ltd.
This regulation entrusts the National Technical Committee for Flow Capacity Measurement to be responsible for interpreting this regulation. Main drafters of this regulation:
Kong Qingyan
Zhu Yonghong
Cui Yaohua
Participating drafters:
Zhang Wushan
Yang Yuling
Zhao Xingguo
Wang Jingan
JJG 1003—2005
(Henan Institute of Metrology)
(Henan Institute of Metrology)
(Henan Institute of Metrology)
(Zhengzhou Gas Corporation)
(Henan Dongfang Gas Co., Ltd.) (Xuchang Nengxin Heating Co., Ltd.) (Jinzhou Kerui Automation Instrument Co., Ltd.) (Beijing Bosda Measurement and Control Instrument Co., Ltd.) Scope
To the literature
Terms and meanings
Overview··
4.1 Working principle
4.2 Structure
4.3 Flow signal input form
5 Measurement performance requirements·..
5.1 Accuracy level of flow totalizer
5.2 Influence of power supply change
General technical requirements·
External gauge inspection
Function inspection
Small cut-off
6.4 Insulation resistance
6.5 Insulation strength
7 Pre-meter control
7.1 Type evaluation, prototype test
JJ: 1(03—2005
7.2 Initial verification, subsequent verification and in-service inspection Appendix A Type evaluation, prototype test items and methods Appendix B Provisions for selection of measurement parameters in flow error test Appendix Verification record format
Appendix D Verification certificate and verification result notification page format
(1)
(3)
1 Scope
JJG 1003 2005
Verification procedure for flow totalizer
This procedure applies to 1 Type evaluation, prototype test, initial verification, subsequent verification and in-service inspection of flow totalizers (hereinafter referred to as integrators).
2 References
This specification makes use of the following references:
JF1015:-2002 General specification for type evaluation and type approval of measuring instruments JJF10[6-2(02 Guide for type evaluation of measuring instruments GB/T13639-1992 Analogue input digital indicating instruments for industrial process measurement, recording and control systems CB2423-1989 Basic environmental testing for electronic products GB6587-1989 Environmental testing for radio and television measuring instruments GB/T 17626-1998 Electromagnetic compatibility testing and geodetic technology When using this specification, attention should be paid to the use of the current valid versions of the above references: 3 Terms and definitions
3. Power-off protection
The function of the instrument to ensure that the data such as the number of signatures in the integrator and the accumulated flow of the integrator can be stored during the power outage of the power supply.
3.2 Sampling period sampling Fxeriod
The time interval between two adjacent samples, unit: s3.3 Low flow cutoff This regulation refers to the integrator, which is designed to overcome the zero drift of the transmitter or sensor or to ensure the normal operation of the flow meter system. When the flow value is lower than a specific value, the instrument will be zeroed and the instrument will operate normally when it is off this value.
Compensation parameter display
Accessorial display parameterAuxiliary display set in the integrator to display the working state of the medium (such as pressure, temperature, etc.). 4 Overview
4.1 Working principle
The working principle of the integrator: Through the collection of the output electrical signals of the matching flow transmitter, flow sensor and other transmitters (temperature, pressure, etc.): Use a certain mathematical model to calculate the instantaneous flow, cumulative flow, etc., and display and store them. Some integrators also have the function of converting instantaneous flow rate into electrical signals for output and quantitative control. The sensors usually include standard throttling devices, turbines, vortex streets, electromagnetic, superwave flow sensors, JJG 1003-2005, transmitters, etc., and compensation pressure transmitters, differential pressure transmitters, temperature transmitters, etc. 4.2 Structure The integrator is mainly composed of input and output units, calculation units, display units and operation keys. The input and output units include flow sensor signal input, temperature, pressure and other compensation signal input, flow signal output, etc. 4.3 Flow signal input form
The input signal of the integrator generally has two forms: analog input signal and pulse signal. Other forms given in the manual can also be used:
Analog signal: Current (0~10) mA and nC (4~20) mA. Voltage DC (0~5) V, DC (1-5)
Pulse signal: Current pulse low level (4±0.25) mA, high level (20±1) mA. Voltage pulse low level is generally not more than 2V. High level is generally not less than 4.5V. Its frequency is usually below 10kHz.
5 Metrology performance requirements
5.1 Accuracy level of integrator
Accuracy level of integrator is divided into basic error limits, as shown in Table 1: The main indication is instantaneous flow, cumulative flow, output current, one or several indications in quantitative control: except for the main indication, the error limit of the indication and auxiliary parameter measurement shall be based on the specification in the instruction manual. Table 1 Comparison table of accuracy level and error limit of integrator Accuracy level
Basic error limit of value
Note: The error limit specified in the table refers to the analog signal input error: for pulse signal input, it refers to the relative recognition error. 5.2 Influence of power supply changes| |tt||For instruments powered by AC 220V, when the power supply voltage changes by ±10%; for instruments powered by 24V, when the power supply changes by ±5%; the change value of the instantaneous pressure, temperature, flow rate, etc. of the instrument compared with the normal voltage shall not exceed one-half of its error limit,
6 General Technical Requirements
6.1 Appearance Inspection
6.1.1 The integrator shall have a detailed instruction manual, which shall indicate the type of applicable flow meter (sensor), the form of output signal, calibration method, operation steps, applicable medium, whether it has temperature and pressure compensation and other functions, and provide reference standards or calculation basis. 6,1.2 The shell and nameplate wiring of the integrator shall be well surface treated. There shall be no defects such as coating shedding, rust, scratches, stains, etc. The text, numbers, symbols, and signs of the display part shall be clear and distinct without overlap, and the instrument display shall be evenly checked without missing strokes. 6.1.3 The nameplate of the meter shall have the mark of the manufacturing license of the measuring instrument and the name of the manufacturer, model, number, accuracy, year and month of manufacture, etc. 6.2 Functional inspection JJG 1(HI3—2005 6.2.1 The effective digits of the flow coefficient (or density, sensor coefficient, etc.) of the meter shall be at least 4 digits: the instantaneous flow display shall have sufficient resolution, and the cumulative flow display shall have at least 6 digits. 6.2.2. For the totalizer used for trade settlement, the parameters related to flow and accumulated flow should be password-protected or sealed. The totalizer used for trade settlement installed in the network cannot be directly modified from a computer or network terminal; the network terminal data is not effective for displaying the flow meter data. 6.3 Small signal cut-off
Small signal cut-off is allowed. If the matching sensor is a standard throttling device, the cut-off point should not be greater than 8% of the maximum flow rate under design conditions. If the matching sensor is other types, the cut-off point should be less than 5% of the maximum flow rate under design conditions. 6.4 Insulation voltage limit
Under environmental conditions of (15~35) %, (45~75) % and (86106) kPa, the insulation voltage at each end shall not be less than 20M. 6.5 Insulation voltage limit
The test environmental conditions are the same as those in Article 6.4. The test voltage specified in Table 2 is applied between each end and between the ends and the casing for 1 minute. No flashover or arcing occurs. Table 2 Insulation strength test applicable test voltmeter instrument terminal nominal value kV
0) - 130
130~250
250~650
7 Measuring instrument control
7. Type evaluation, prototype test
Test voltage kV
Type evaluation and prototype test shall be carried out in accordance with JJF1015-2002 "General Specification for Type Evaluation and Type Approval of Measuring Instruments" and J1016.-2002 "Guidelines for Writing Type Evaluation Outline of Measuring Instruments". Appendix A gives the items and methods for type evaluation and prototype test. 7.2 Pre-calibration, subsequent calibration and in-use inspection 7.2.1 Inspection conditions 7.2.1.1 Main calibration equipment 1) Standard ammeter The maximum allowable error is less than 15% of the allowable error limit of the integrator to be tested 2) Standard ammeter The maximum allowable error is less than 1/5 of the allowable error limit of the integrator to be tested 3) Universal counter J3 1003-2005 Counting range: 0~99999; resolution: 1 word. 4) Standard resistance box The maximum allowable error is less than 1/5 of the allowable error limit of the integrator to be tested. 5) The resolution of the timer is better than 0.01s.
7,2.1.2 Accessories
1) DC signal source
Can output one DC (0~20) mA [or DC (0~5) V1 continuously adjustable signal, stability: 0.05%! 2h:
2) Frequency signal generator
Frequency range: (0~100) kHz, maximum allowable error: ±1×10-5. 3) Millivolt generator
Output range: DC (0~50) mV, maximum allowable error: ±1×10-. 4) Insulation resistance meter
Output voltage 500V, 10 levels.
5) Withstand voltage tester
Voltage range: (0~5) kV, ±5%, frequency: (45~55) Hz, power not less than 0.25kW. 6) Power supply
DC (0~30) V adjustable: AC (0~220) V adjustable: Maximum allowable error: ±1%7) Resistance box
(0 -9999.99), better than 1.0 level.
7.2.2 Calibration environment conditions
Ambient temperature (20±5), ambient humidity (45~75)%1.7.2.2.1
7.2.2.2 AC power supply (220±22) V, frequency (50±1) Hz7.2.2.3 There should be no other magnetic field interference except the geomagnetic field, no vibration and other disturbances7.2.3 Calibration items
The calibration items of the integrator are listed in Table 3.
Table 3 Calibration items of the integrator
Calibration items
Appearance and Functional inspection
Basic error
Small signal removal function
Influence of power supply change
Insulation resistance
Insulation strength
First verification
Subsequent verification and inspection during use
Note: "+" indicates point verification, "-" indicates that verification is not required, "*" indicates that after major repairs, this verification should be added, and it is not required during subsequent use.
7.2.4 Verification method
7.2.4.1 Appearance and functional inspection
JJG 1003 -2005
The nameplate, appearance and function of the instrument to be inspected by the force method measured by H shall comply with the requirements of Articles 6.1 and 6.2 of this Regulation. 7.2.4.2 Verification of basic error
Before verification, connect the wires according to Figure 1. Normally, the instrument to be inspected shall be powered on and preheated for 10 minutes. If the product instructions have other provisions for the preheating time, preheat according to the time specified in the instructions. 1) Instantaneous flow
a. The test points shall be 0.2 times, 0.4 times, 0.6 times, 0.8 times, and 1 times the measuring limit of the input signal corresponding to the maximum flow of the flow sensor (or transmitter); the above verification points with pressure and temperature compensation functions are under the design state. In addition, any two points shall be selected when the pressure is constant and the temperature is within the design range, and the flow rate is the maximum; the temperature is constant and the pressure is within the design range. Take any two points and perform two calibrations under the condition of maximum flow. Note: If the point selected for the output signal of the flow sensor (or transmitter) is not within the flow range, the 0.2 times point can be set as the point consistent with the flow.
Frequency signal generator
Particle rate counter
Standard current source
Standard resistance box
(resistance)
Integrator calibration wiring diagram
h, according to the selected calibration point, the integration is only for secondary circulation measurement Amperemeter
Working power supply
c. Calculate the error (E, or E) of each flow point according to the following formula. The analog signal input is calculated according to formula (1), and the pulse signal input is calculated according to formula (2). It should meet the requirements for the error limit of the integrator in Table 1. En = *.- 4 × 100%
Wujin: 4
-the flow meter indication value of the flow calibration point; 9mx-the maximum flow of the meter under the design state; Y..
the theoretical calculated value of the flow at the flow calibration point. E. = =9 × 100%
Note: The calculation should be based on the type of flow meter used, the measured medium, the actual pulse working condition of the calibration point, and the calculation should be carried out according to the relevant national standards and metrological inspection procedures of the flow meter. This procedure specifies the setting of the spray value of several types of flow meters in the special record. 2) Cumulative flow rectification principle Cumulative flow verification can be carried out in any state. Select the flow input full scale signal, read the cumulative flow value for n (n includes 10min), the uncertainty of the verification resolution should be better than 1/5 of the maximum allowable error and should meet the requirements of the totalizer limit in Table 1. The cumulative flow error (E.) is calculated by pressing or: 0 -0#×100%
Where: 0.—The cumulative flow indication of the totalizer. Q
Theoretical calculation value of the cumulative flow of the totalizer.
3) Compensation sign maximum display
a. The test point is around 0.2Amx, 0.4Am, 0.64m, 0.8A, and Am. Note: 1.4 is the upper limit of the analog input signal. 2. For example, if the accumulated value is 0.2Am, when the corresponding input signal is zero, the measured value can be 0.34m3. For the F-type thermocouple, A. Take 500% of the analog double. Select the calibration point, and the integrator performs secondary cycle measurement. (3)
c Calculate the error (E) of each calibration point according to the following formula, which should meet the requirements of the user manual for the integrator error limit.
Wu: A,--a fixed point integrator display: E
A - An × 100%
A.--a theoretical calculated value of the input signal of the calibration point, Amm
The theoretical calculated maximum value of the input signal, 4) Output current
1. The test points are 0.24m0.44., 0.64m, 0.89m9mx. 5. Select the calibration point, and the integrator performs two-cycle measurement. ", calculate the error (E) of each calibration point according to the following formula, which should meet the requirements of the error limit of the integrator in Table 1 -
Ea n-1
×100%
Where: - the output current value of the calibration point.
1. - the current value corresponding to the theoretical calculation of the flow display at the calibration point, the current estimate corresponding to the theoretical calculation of the maximum flow. fa
The current value corresponding to the zero point of flow.
5) Quantitative control
a. The test point is 0.29m0.54m9mx or so
b. Select the calibration point, and the integrator performs two-cycle measurement. \. Calculate the error (E,) of each calibration point according to the following formula, which should meet the requirements of the error limit of the integrator in Table 5.~ 5×100%
JJG 1(03—2005
Wherein: S is the theoretical calculated value of the total amount of control at the test point. 5. —Set value.
7.2.4.3 Small signal cutoff
The wiring and verification method are the same as Figure 1. Slowly change the input signal from low to high near the cut-off point until the corresponding parameter on the integrator decreases. Then slowly reduce the input signal until the corresponding parameter on the integrator suddenly drops to zero. At this time, the flow value is the cut-off point, and its data should meet the requirements of Article 6.3: 7.2.4.4 The influence of power supply change
can be carried out simultaneously during the basic error verification. First, the instrument under test is powered on according to the stop band value, and the instrument indication value is read. Then, it is increased and decreased to the upper and lower limits of the allowable power supply of the instrument respectively. At this time, the indication of the instrument is compared with the normal power supply value, and the change shall not exceed half of the error limit. 7.2.4.5 Insulation
The power switch of the instrument is in the hand-held position, and the input terminals, output terminals, and power supply terminals are short-circuited respectively: use a rated DC voltage of 50V The insulation resistance meter is tested according to the following terminals. The test results shall meet the requirements of Article 6.4.
Input terminal - external
Output terminal - shell
Power terminal - external
Connection: Power terminal refers to the meter current power supply terminal. 7.2.4.6 Insulation strength
Use the (45~55)H current limit, and the test voltage shall be specified in Table 2. The test shall be carried out within ten seconds of the terminal specified in 7.4.5. 2.5 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for qualified integrators, and a seal or password shall be placed on the part where the settings of the integrator can be changed for integrators used for trade settlement. For unqualified integrators, a verification result notice shall be issued and the unqualified items shall be noted.
7.2.6 Verification cycle
The verification cycle of integrators is 1.
Appendix A
JJG 1003—2005
Type evaluation, prototype test items and methods In addition to the tests required in the main text (according to Articles 7.2.2 and 7.2.3 of the regulations), the test items and methods specified in this appendix shall also be tested. AI test items R
All test items involved in this appendix are as follows: 1. Basic error
2. Output signal load test
3. Power-off protection function
4. Continuous operation test
5. Static low-voltage test
6. Static high temperature test
7. Ambient temperature influence test
8. Alternating heat filter test
9. Other installation and transportation test
10. Power interruption test
11. Electrical fast reverse transient pulse immunity test
12: Electrostatic discharge immunity test
13. Frequency field immunity test
A.2 Basic error
1. Test point: 0.2 times, 0.4 times, 0.6 times, 0.8 times of the input signal of the flow sensor (or transmitter); the test point should be 0.2 times, 0.4 times, 0.6 times, 0.8 times of the input signal of the flow sensor (or transmitter); the test point should be 0.2 times, 0.4 times, 0.6 times, 0.8 times of the input signal of the flow sensor (or transmitter) with pressure and temperature compensation function; the test points should be selected within the compensation range respectively, and the output signal of the flow sensor (or transmitter) should be crossed with the selected signal to form the test points. Note: If the output signal of the flow sensor (or transmitter) is within the positive flow range, the U.2 times point can be raised to a point consistent with the flow rate reduction
b, and the integrator performs two cycles of measurement according to the selected points:. According to formulas (1) and (2) in the text, the error of the flow points should meet the requirements of the error limit of the flow integrator in Table 1 in the text:
A.3 Output signal load testbzxz.net
Connect a resistance box in series between the output end of the integrator and the standard ammeter and adjust the resistance to zero: Adjust the output current to about 90% of the reported maximum current and record the current value: According to the load resistance range specified in the instruction manual, adjust the resistance to the maximum load resistance, read the current value at this time and compare it with the original current value. The deviation should be less than the basic error limit requirement
A.4 Power-off protection function
This calibration can be performed in any state. When the meter is running, check the setting parameters and accumulated flow, cut off the power supply by 12% and then restore the power supply to check whether the setting parameters and accumulated flow remain unchanged: A.5 Continuous operation test
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