JJG 1033-2007 PDF English
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JJG 1033-2007: Verification Regulation of Electromagnetic Flowmeters---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JJG1033-2007
JJG
METROLOGICAL VERIFICATION REGULATION
Electromagnetic flowmeters
Issued on. NOVEMBER 21, 2007
Implemented on. FEBRUARY 21, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Verification Regulation of
Electromagnetic Flowmeters
This Regulation was approved by the General Administration of Quality Supervision,
Inspection and Quarantine on November 21, 2007, which will be implemented on
February 21, 2008.
Under the jurisdiction of.
National Technical Committee for Flow and Capacity Measurement
Main drafting organization.
China National Institute of Metrology
Participating drafting organizations.
Henan Institute of Metrology
Shanghai Guanghua-Eremite Instrument Co., Ltd.
Shanghai Chango Automation Equipment Co., Ltd.
Beijing Ripu Electronics Group
Kaifeng Instrument Co., Ltd.
Hangzhou Zhenhua Instrument Co., Ltd.
ABB (China) Co., Ltd.
This Regulation is entrusted to the National Technical Committee for Flow and
Capacity Measurement for interpretation
Main drafters of this Regulation.
Meng Tao (China National Institute of Metrology)
Participating drafters of this Regulation.
Zhu Yongcheng (Henan Institute of Metrology)
Song Jianjun (Shanghai Guanghua-Eremite Instrument Co., Ltd.)
Cheng Xiangxi (Shanghai Chengbo Automation Equipment Co., Ltd.)
Replacing JJG 198-1994
Li Zhen Zhong (Beijing Ruipu Electronics Group)
Liang Zhonghe (Kaifeng Instrument Co., Ltd.)
Fang Xiaofeng (Hangzhou Zhenhua Instrument Co., Ltd.)
Wang Hongjie (ABB (China) Co., Ltd.)
Table of Contents
1 Scope... 5
2 Normative references... 5
3 Terms... 5
4 Overview... 6
4.1 Working principle... 6
4.2 Structure and use... 6
5 Measurement performance requirements... 7
5.1 Accuracy grade... 7
5.2 Fiducial error... 7
5.3 Error expression method and selection principle... 7
5.4 Repeatability... 7
6 General technical requirements... 8
6.1 Accompanying documents... 8
6.2 Marking... 8
6.3 Appearance... 9
6.4 Tightness... 9
6.5 Protection function... 9
7 Measuring instrument control... 9
7.1 Verification conditions... 9
7.2 Verification items and verification methods... 12
7.3 Handling of verification results... 18
7.4 Verification cycle... 19
Appendix A Type evaluation outline... 20
Appendix B Format of verification certificate and verification result notice (inner page)
... 31
Verification regulation of electromagnetic flowmeters
1 Scope
This Regulation applies to the type evaluation, initial verification, subsequent
verification, in-use inspection of electromagnetic flowmeters (hereinafter referred to as
flowmeters), which are installed in closed pipelines. It is not applicable to flowmeters
for measuring blood, liquid metal, iron ore slurry and open channel flow measurement,
nor is it applicable to the verification of insertion electromagnetic flowmeters and
electromagnetic water meters.
2 Normative references
The provisions contained in the following standards and regulations constitute the
provisions of this Regulation through reference.
JJF 1004-2004 Metrological terms and their definitions for flow rate
GB/T 18659-2002 (idt ISO 9104.1991) Measurement of fluid flow in closed
conduits - Methods of evaluating the performance of electromagnetic flow - Meters
for liquids
GB/T 18660-2002 (idt ISO 6817.1992) Measurement of conductive liquid flow in
closed conduits - Method using electromagnetic flowmeters
JB/T 9248-1999 Electromagnetic flowmeters
It shall be noted that the current valid versions of the above references shall be used.
3 Terms
3.1 Primary device (sensor)
A device used to generate a signal proportional to the flow rate. The primary device
mainly includes the following units.
3.2 Secondary device (converter)
A circuit device, that converts the induced electromotive force taken from the
primary device into a standard output signal proportional to the flow rate.
3.3 Meter characteristic coefficient
A parameter that can change the metering performance of the flowmeter by
modifying its value.
3.4 Flow conditioner
A component that can reduce vortices and improve velocity distribution.
4 Overview
4.1 Working principle
In a closed pipe, a magnetic field perpendicular to the flow direction is set up. The flow
rate is calculated by measuring the induced electromotive force generated by the
movement of the conductive liquid in the magnetic field.
5 Measurement performance requirements
5.1 Accuracy grade
The accuracy grade and maximum allowable error of the flow meter within the
specified flow range shall comply with the provisions of Table 1.The relative indication
error is used for the flow meter error expression.
5.2 Fiducial error
For the error expression of the flow meter used for instantaneous flow indication, the
fiducial error can also be used. Its maximum allowable error series shall comply with
the provisions of Table 1.The accuracy grade is no longer given in the expression of its
verification results, but its maximum allowable error is used; FS shall be marked after
the maximum allowable error, such as ±0.5%FS.
5.4 Repeatability
The repeatability of the flowmeter shall not exceed 1/3 of the absolute value of the
maximum allowable error, which is specified for the corresponding accuracy grade.
6 General technical requirements
6.1 Accompanying documents
The flowmeter shall be accompanied by an instruction manual, which shall state the
technical conditions and the metering performance of the flowmeter. The flowmeter
that as periodically calibrated shall also have a verification certificate for the previous
verification.
6.2 Marking
6.2.2 The flow meter shall have obvious flow direction markings.
6.3 Appearance
6.3.1 The appearance of the newly manufactured flow meter shall be well treated and
shall not have burrs, scratches, cracks, rust, mildew spots, coating and plating shall not
have peeling or flaking.
6.3.2 The welding of the connection part of the flow meter body shall be smooth and
clean; there shall be no false welding or desoldering.
6.3.3 The sealing surface shall be flat and free of damage.
6.4 Tightness
The flowmeter shall be kept at the maximum test pressure for 5 minutes under the test
installation conditions, there shall be no leakage at the connection of the flowmeter and
its upstream and downstream straight pipe segments.
6.5 Protection function
The flowmeter shall have a protection function for the modification of the flow
characteristic coefficient, which can avoid accidental changes or record the historical
modification process.
7 Measuring instrument control
Measuring instrument control includes type evaluation, initial verification, subsequent
verification, and in-use inspection. Appendix A is the outline of type evaluation.
7.1 Verification conditions
7.1.1 Flow standard device
7.1.2 Verification liquid
7.1.2.1 The verification liquid can generally be clean water without air, fibers, magnetic
particles and other visible particles. If other liquids are used, their type (including
commercial name), viscosity, density, conductivity shall be stated in the verification
certificate.
7.1.2.2 During the verification, the liquid shall always fill the test pipe and flow in a
single phase, stable and vortex-free manner.
7.1.3 Verification environmental conditions
7.1.3.1 Atmospheric environmental conditions shall generally meet the following
requirements.
7.1.4 Installation conditions
7.1.4.1 Length of straight pipe segment on the upstream and downstream sides of the
flowmeter
Determine the length of the straight pipe segment on the upstream and downstream
sides of the flowmeter, according to the requirements of the flowmeter instruction
manual.
7.1.7 Flowmeter output signal
The flowmeter output signal shall be correctly collected in accordance with the
provisions of the flowmeter manual. For flowmeters with multiple signal outputs, the
method required by the inspection applicant or the method recommended in the manual
shall be used first. If both are particularly required, it is recommended to use the pulse
output of the flowmeter for verification.
7.1.8 The grounding of the flowmeter shall be operated in accordance with the
requirements of the flowmeter manual; the verification liquid and the primary device
shall be at the same potential.
7.2 Verification items and verification methods
7.2.6 Adjustment of characteristic coefficient of flowmeter
If the characteristic coefficient of the flowmeter is adjusted during verification, the
original coefficient and the new coefficient shall be indicated in the verification
certificate respectively.
7.3 Handling of verification results
A verification certificate shall be issued to the qualified flowmeters. A verification result
notice shall be issued to the unqualified flowmeters, with the unqualified items
indicated. The format is as shown in Appendix B.
7.4 Verification cycle
The verification cycle for flowmeters, which have an accuracy level of 0.2 or better, is
1 year. The verification cycle for flowmeters, which have an accuracy level lower than
0.2 or using fiducial errors, is 2 years.
JJG
METROLOGICAL VERIFICATION REGULATION
Electromagnetic flowmeters
Issued on. NOVEMBER 21, 2007
Implemented on. FEBRUARY 21, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Verification Regulation of
Electromagnetic Flowmeters
This Regulation was approved by the General Administration of Quality Supervision,
Inspection and Quarantine on November 21, 2007, which will be implemented on
February 21, 2008.
Under the jurisdiction of.
National Technical Committee for Flow and Capacity Measurement
Main drafting organization.
China National Institute of Metrology
Participating drafting organizations.
Henan Institute of Metrology
Shanghai Guanghua-Eremite Instrument Co., Ltd.
Shanghai Chango Automation Equipment Co., Ltd.
Beijing Ripu Electronics Group
Kaifeng Instrument Co., Ltd.
Hangzhou Zhenhua Instrument Co., Ltd.
ABB (China) Co., Ltd.
This Regulation is entrusted to the National Technical Committee for Flow and
Capacity Measurement for interpretation
Main drafters of this Regulation.
Meng Tao (China National Institute of Metrology)
Participating drafters of this Regulation.
Zhu Yongcheng (Henan Institute of Metrology)
Song Jianjun (Shanghai Guanghua-Eremite Instrument Co., Ltd.)
Cheng Xiangxi (Shanghai Chengbo Automation Equipment Co., Ltd.)
Replacing JJG 198-1994
Li Zhen Zhong (Beijing Ruipu Electronics Group)
Liang Zhonghe (Kaifeng Instrument Co., Ltd.)
Fang Xiaofeng (Hangzhou Zhenhua Instrument Co., Ltd.)
Wang Hongjie (ABB (China) Co., Ltd.)
Table of Contents
1 Scope... 5
2 Normative references... 5
3 Terms... 5
4 Overview... 6
4.1 Working principle... 6
4.2 Structure and use... 6
5 Measurement performance requirements... 7
5.1 Accuracy grade... 7
5.2 Fiducial error... 7
5.3 Error expression method and selection principle... 7
5.4 Repeatability... 7
6 General technical requirements... 8
6.1 Accompanying documents... 8
6.2 Marking... 8
6.3 Appearance... 9
6.4 Tightness... 9
6.5 Protection function... 9
7 Measuring instrument control... 9
7.1 Verification conditions... 9
7.2 Verification items and verification methods... 12
7.3 Handling of verification results... 18
7.4 Verification cycle... 19
Appendix A Type evaluation outline... 20
Appendix B Format of verification certificate and verification result notice (inner page)
... 31
Verification regulation of electromagnetic flowmeters
1 Scope
This Regulation applies to the type evaluation, initial verification, subsequent
verification, in-use inspection of electromagnetic flowmeters (hereinafter referred to as
flowmeters), which are installed in closed pipelines. It is not applicable to flowmeters
for measuring blood, liquid metal, iron ore slurry and open channel flow measurement,
nor is it applicable to the verification of insertion electromagnetic flowmeters and
electromagnetic water meters.
2 Normative references
The provisions contained in the following standards and regulations constitute the
provisions of this Regulation through reference.
JJF 1004-2004 Metrological terms and their definitions for flow rate
GB/T 18659-2002 (idt ISO 9104.1991) Measurement of fluid flow in closed
conduits - Methods of evaluating the performance of electromagnetic flow - Meters
for liquids
GB/T 18660-2002 (idt ISO 6817.1992) Measurement of conductive liquid flow in
closed conduits - Method using electromagnetic flowmeters
JB/T 9248-1999 Electromagnetic flowmeters
It shall be noted that the current valid versions of the above references shall be used.
3 Terms
3.1 Primary device (sensor)
A device used to generate a signal proportional to the flow rate. The primary device
mainly includes the following units.
3.2 Secondary device (converter)
A circuit device, that converts the induced electromotive force taken from the
primary device into a standard output signal proportional to the flow rate.
3.3 Meter characteristic coefficient
A parameter that can change the metering performance of the flowmeter by
modifying its value.
3.4 Flow conditioner
A component that can reduce vortices and improve velocity distribution.
4 Overview
4.1 Working principle
In a closed pipe, a magnetic field perpendicular to the flow direction is set up. The flow
rate is calculated by measuring the induced electromotive force generated by the
movement of the conductive liquid in the magnetic field.
5 Measurement performance requirements
5.1 Accuracy grade
The accuracy grade and maximum allowable error of the flow meter within the
specified flow range shall comply with the provisions of Table 1.The relative indication
error is used for the flow meter error expression.
5.2 Fiducial error
For the error expression of the flow meter used for instantaneous flow indication, the
fiducial error can also be used. Its maximum allowable error series shall comply with
the provisions of Table 1.The accuracy grade is no longer given in the expression of its
verification results, but its maximum allowable error is used; FS shall be marked after
the maximum allowable error, such as ±0.5%FS.
5.4 Repeatability
The repeatability of the flowmeter shall not exceed 1/3 of the absolute value of the
maximum allowable error, which is specified for the corresponding accuracy grade.
6 General technical requirements
6.1 Accompanying documents
The flowmeter shall be accompanied by an instruction manual, which shall state the
technical conditions and the metering performance of the flowmeter. The flowmeter
that as periodically calibrated shall also have a verification certificate for the previous
verification.
6.2 Marking
6.2.2 The flow meter shall have obvious flow direction markings.
6.3 Appearance
6.3.1 The appearance of the newly manufactured flow meter shall be well treated and
shall not have burrs, scratches, cracks, rust, mildew spots, coating and plating shall not
have peeling or flaking.
6.3.2 The welding of the connection part of the flow meter body shall be smooth and
clean; there shall be no false welding or desoldering.
6.3.3 The sealing surface shall be flat and free of damage.
6.4 Tightness
The flowmeter shall be kept at the maximum test pressure for 5 minutes under the test
installation conditions, there shall be no leakage at the connection of the flowmeter and
its upstream and downstream straight pipe segments.
6.5 Protection function
The flowmeter shall have a protection function for the modification of the flow
characteristic coefficient, which can avoid accidental changes or record the historical
modification process.
7 Measuring instrument control
Measuring instrument control includes type evaluation, initial verification, subsequent
verification, and in-use inspection. Appendix A is the outline of type evaluation.
7.1 Verification conditions
7.1.1 Flow standard device
7.1.2 Verification liquid
7.1.2.1 The verification liquid can generally be clean water without air, fibers, magnetic
particles and other visible particles. If other liquids are used, their type (including
commercial name), viscosity, density, conductivity shall be stated in the verification
certificate.
7.1.2.2 During the verification, the liquid shall always fill the test pipe and flow in a
single phase, stable and vortex-free manner.
7.1.3 Verification environmental conditions
7.1.3.1 Atmospheric environmental conditions shall generally meet the following
requirements.
7.1.4 Installation conditions
7.1.4.1 Length of straight pipe segment on the upstream and downstream sides of the
flowmeter
Determine the length of the straight pipe segment on the upstream and downstream
sides of the flowmeter, according to the requirements of the flowmeter instruction
manual.
7.1.7 Flowmeter output signal
The flowmeter output signal shall be correctly collected in accordance with the
provisions of the flowmeter manual. For flowmeters with multiple signal outputs, the
method required by the inspection applicant or the method recommended in the manual
shall be used first. If both are particularly required, it is recommended to use the pulse
output of the flowmeter for verification.
7.1.8 The grounding of the flowmeter shall be operated in accordance with the
requirements of the flowmeter manual; the verification liquid and the primary device
shall be at the same potential.
7.2 Verification items and verification methods
7.2.6 Adjustment of characteristic coefficient of flowmeter
If the characteristic coefficient of the flowmeter is adjusted during verification, the
original coefficient and the new coefficient shall be indicated in the verification
certificate respectively.
7.3 Handling of verification results
A verification certificate shall be issued to the qualified flowmeters. A verification result
notice shall be issued to the unqualified flowmeters, with the unqualified items
indicated. The format is as shown in Appendix B.
7.4 Verification cycle
The verification cycle for flowmeters, which have an accuracy level of 0.2 or better, is
1 year. The verification cycle for flowmeters, which have an accuracy level lower than
0.2 or using fiducial errors, is 2 years.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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