JJG 162-2019 PDF English
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Cold Potable Water Meters
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Verification Regulation of Cold Water Meter
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Cold water test procedures
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| JJG 162-1985 | English | RFQ |
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JJG 162-2019: Cold Potable Water Meters---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/JJG162-2019
JJG
METROLOGICAL VERIFICATION REGULATION
Cold portable water meters
Issued on. DECEMBER 31, 2019
Implemented on. MARCH 31, 2020
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Verification Regulation of
cold portable water meters
Under the jurisdiction of.
Liquid Flow Sub-Technical Committee of National Flow Measurement Technical
Committee
Main drafting organization.
Zhejiang Institute of Metrology
Beijing Institute of Metrology and Testing Science
Participating drafting organizations.
Henan Institute of Metrology
Chongqing Institute of Metrology and Quality Testing Science
Ningbo Donghai Instrument Waterway Co., Ltd.
Fuzhou Kerong Instrument Co., Ltd.
This Regulation is entrusted to the Liquid Flow Sub-Technical Committee of the
National Flow Measurement Technical Committee for interpretation
Main drafters of this Regulation.
Zhao Jianliang (Zhejiang Institute of Metrology)
Hu Dixin (Zhejiang Institute of Metrology)
Li Chen (Beijing Institute of Metrology and Testing Science)
Participating drafters of this Regulation.
Zhu Yonghong (Henan Institute of Metrology)
Zhang Zehong (Chongqing Institute of Metrology and Quality Testing Science)
Lin Zhiliang (Ningbo Donghai Instrument Waterway Co., Ltd.)
Chen Hanzhang (Fuzhou Kerong Instrument Co., Ltd.)
Replacing text part of JJG 162-2009
Table of Contents
Introduction... 4
1 Scope... 6
2 Normative references... 6
3 Terms and units of measurement... 6
3.1 Terms... 6
3.2 Units of measurement... 12
4 Overview... 12
4.1 Principle and structural composition... 12
4.2 Classification... 13
5 Metering performance requirements... 14
5.1 Flow characteristics of water meters... 14
5.2 Accuracy level and maximum allowable error... 15
6 General technical requirements... 15
6.1 Appearance, sign, seal... 15
6.2 Functions of electronic devices... 18
6.3 Tightness... 19
7 Measuring instrument control... 19
7.1 Verification conditions... 19
7.2 Verification items... 22
7.3 Verification method... 22
7.4 Handling of verification results... 33
7.5 Verification cycle... 34
Appendix A Methods for in-use inspection of water meter... 35
Appendix B Reference format of verification records... 38
Appendix C Format of the inner pages of the verification certificate and verification
result notification... 41
Appendix D Classification of water meters... 42
Appendix E Density lookup table method... 47
1 Scope
This Regulation applies to the initial verification, subsequent verification, in-use
inspection of cold portable water meters.
The cold portable water meter referred to in this Regulation is a water meter, which has
a temperature grade T30 and T50, measures cold portable water flowing through a
closed full pipe, including water meters whose working principle is based on
mechanical principle, water meters whose working principle is based on electronic or
electromagnetic principle, water meters based on mechanical principle with electronic
device.
2 Normative references
This Regulation makes reference to the following documents.
JJG 164 Verification regulation of standard facilities for liquid flowrate
JJG 643 Verification regulation of flow standard facilities by master meter method
JJG 1113 Verification regulation of verification facility for water meters
JJF 1777-2019 Program of pattern evaluation of cold potable water meters
For any dated references, only the dated version applies to this Regulation; for any
undated referenced document, its latest version (including all amendments) applies to
this Regulation.
3 Terms and units of measurement
3.1 Terms
3.1.1 Water meter
Under measurement conditions, an instrument used to continuously measure, record,
and display the volume of water flowing through the measurement transducer.
3.1.2 Measurement transducer
The water meter component that converts the measured water flow or volume into
a signal and transmits it to the calculator, including a sensor.
3.1.13 Permanent flow rate (Q3)
The maximum flow rate under rated working conditions. At this flow rate, the water
meter shall work normally and meet the maximum allowable error requirements.
3.1.14 Overload flow rate (Q4)
The maximum flow rate that requires the water meter to meet the maximum
allowable error requirements in a short period of time and then maintain the metering
characteristics under rated working conditions.
4 Overview
4.1 Principle and structural composition
Cold portable water meter (hereinafter referred to as water meter) is a measuring
instrument named after its use. It is used to measure the total volume of cold portable
water flowing through a closed full pipe. It is widely used in the trade settlement
measurement of the tap water delivery volume, as supplied by the tap water supply
department to residents and industrial and commercial users.
4.2 Classification
According to the working principle and structural characteristics of the water meter, it
can generally be divided into.
5 Metering performance requirements
5.1 Flow characteristics of water meters
5.1.1 The flow characteristics of water meters shall be determined according to the
values of Q1, Q2, Q3, Q4.
5.1.5 The ratio Q2/Q1 is 1.6.
5.1.6 The ratio Q4/Q3 is 1.25.
5.2 Accuracy level and maximum allowable error
5.2.1 The accuracy level of water meters is divided into level 1 and level 2.The
maximum allowable error of water meters with different accuracy levels at different
working temperatures shall comply with the provisions of Table 4.
5.2.2 If all indication errors of the water meter have the same sign, at least one of the
indication errors shall not exceed 1/2 of the maximum allowable error.
6 General technical requirements
6.1 Appearance, sign, seal
6.1.1 Appearance
6.1.2 Sign
6.1.2.1 Measurement legal sign
The water meter shall be marked with the type approval sign and number of the
measuring instrument in a prominent position.
6.1.2.2 Marking of measuring instruments
The water meter shall clearly and permanently indicate the following information on
the housing, the dial or nameplate of the indicating device, the inseparable cover, either
centrally or dispersedly.
6.1.3 Seal
6.1.3.1 The water meter shall have a protective device with a seal or a closed structure,
to ensure that before and after correct installation of water meter, it cannot disassemble
or change the water meter and its adjustment device, correction device, related
measuring instruments, without damaging the protective device or the seal of the
protective device. The verification sign and protective seal of the water meter shall be
applied to the part that can be seen without opening or disassembling the water meter.
6.2 Functions of electronic devices
6.2.1 For water meters with electronic devices, it shall explain various functions related
to user use and operation in the instruction manual and other accompanying documents.
The modifiable parameters stored in the electronic device that affect the measurement
results, such as sensor coefficient, instrument coefficient, signal equivalent, correction
coefficient, etc., shall be available on the nameplate or accompanying documents of the
water meter and related measuring instruments.
6.3 Tightness
6.3.1 Newly manufactured water meters shall be able to withstand a tightness test of
1.6 MAP for 1 min without seepage, leaking or damage.
6.3.2 Water meters in use shall not leak under working conditions.
7 Measuring instrument control
Measuring instrument control includes initial verification, subsequent verification, and
in-use inspection.
7.1 Verification conditions
7.1.1 Measuring standards and supporting equipment
7.3 Verification method
7.3.1 Inspection of appearance, sign, seal
7.3.1.1 Carry out visual inspection for the appearance of the water meter; it shall comply
with the provisions of 6.1.1.
7.3.1.2 Carry out visual inspection for the sign of the water meter; it shall comply with
the provisions of 6.1.2.
7.3.1.3 Carry out visual inspection for the protective device and seal of the water meter.
7.3.4 Verification of indication error
7.3.4.1 Verification flow point
The verification flow points of the water meter are generally Q1, Q2, Q3, adding 1.1Qx2
for combination water meters. If the additional verification flow point is indicated in
the accompanying documents of the water meter, this flow point shall also be added.
7.3.4.3 Verification signal
If the mechanical water meter contains a component that can be quickly verified, the
verification function of the component can be used, to connect an external sensor to
provide a verification signal.
7.5 Verification cycle
7.5.1 For water meters which have a nominal diameter of DN50 or less and Q3 not
greater than 16 m3/h, only the first mandatory verification before installation is carried
out; the meter is used within a limited period of time and replaced upon expiration. The
service life is stipulated as follows.
7.5.2 The verification cycle of water meters, which have a nominal diameter exceeding
DN50 or a Q3 exceeding 16 m3/h, is generally 2 years.
JJG
METROLOGICAL VERIFICATION REGULATION
Cold portable water meters
Issued on. DECEMBER 31, 2019
Implemented on. MARCH 31, 2020
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Verification Regulation of
cold portable water meters
Under the jurisdiction of.
Liquid Flow Sub-Technical Committee of National Flow Measurement Technical
Committee
Main drafting organization.
Zhejiang Institute of Metrology
Beijing Institute of Metrology and Testing Science
Participating drafting organizations.
Henan Institute of Metrology
Chongqing Institute of Metrology and Quality Testing Science
Ningbo Donghai Instrument Waterway Co., Ltd.
Fuzhou Kerong Instrument Co., Ltd.
This Regulation is entrusted to the Liquid Flow Sub-Technical Committee of the
National Flow Measurement Technical Committee for interpretation
Main drafters of this Regulation.
Zhao Jianliang (Zhejiang Institute of Metrology)
Hu Dixin (Zhejiang Institute of Metrology)
Li Chen (Beijing Institute of Metrology and Testing Science)
Participating drafters of this Regulation.
Zhu Yonghong (Henan Institute of Metrology)
Zhang Zehong (Chongqing Institute of Metrology and Quality Testing Science)
Lin Zhiliang (Ningbo Donghai Instrument Waterway Co., Ltd.)
Chen Hanzhang (Fuzhou Kerong Instrument Co., Ltd.)
Replacing text part of JJG 162-2009
Table of Contents
Introduction... 4
1 Scope... 6
2 Normative references... 6
3 Terms and units of measurement... 6
3.1 Terms... 6
3.2 Units of measurement... 12
4 Overview... 12
4.1 Principle and structural composition... 12
4.2 Classification... 13
5 Metering performance requirements... 14
5.1 Flow characteristics of water meters... 14
5.2 Accuracy level and maximum allowable error... 15
6 General technical requirements... 15
6.1 Appearance, sign, seal... 15
6.2 Functions of electronic devices... 18
6.3 Tightness... 19
7 Measuring instrument control... 19
7.1 Verification conditions... 19
7.2 Verification items... 22
7.3 Verification method... 22
7.4 Handling of verification results... 33
7.5 Verification cycle... 34
Appendix A Methods for in-use inspection of water meter... 35
Appendix B Reference format of verification records... 38
Appendix C Format of the inner pages of the verification certificate and verification
result notification... 41
Appendix D Classification of water meters... 42
Appendix E Density lookup table method... 47
1 Scope
This Regulation applies to the initial verification, subsequent verification, in-use
inspection of cold portable water meters.
The cold portable water meter referred to in this Regulation is a water meter, which has
a temperature grade T30 and T50, measures cold portable water flowing through a
closed full pipe, including water meters whose working principle is based on
mechanical principle, water meters whose working principle is based on electronic or
electromagnetic principle, water meters based on mechanical principle with electronic
device.
2 Normative references
This Regulation makes reference to the following documents.
JJG 164 Verification regulation of standard facilities for liquid flowrate
JJG 643 Verification regulation of flow standard facilities by master meter method
JJG 1113 Verification regulation of verification facility for water meters
JJF 1777-2019 Program of pattern evaluation of cold potable water meters
For any dated references, only the dated version applies to this Regulation; for any
undated referenced document, its latest version (including all amendments) applies to
this Regulation.
3 Terms and units of measurement
3.1 Terms
3.1.1 Water meter
Under measurement conditions, an instrument used to continuously measure, record,
and display the volume of water flowing through the measurement transducer.
3.1.2 Measurement transducer
The water meter component that converts the measured water flow or volume into
a signal and transmits it to the calculator, including a sensor.
3.1.13 Permanent flow rate (Q3)
The maximum flow rate under rated working conditions. At this flow rate, the water
meter shall work normally and meet the maximum allowable error requirements.
3.1.14 Overload flow rate (Q4)
The maximum flow rate that requires the water meter to meet the maximum
allowable error requirements in a short period of time and then maintain the metering
characteristics under rated working conditions.
4 Overview
4.1 Principle and structural composition
Cold portable water meter (hereinafter referred to as water meter) is a measuring
instrument named after its use. It is used to measure the total volume of cold portable
water flowing through a closed full pipe. It is widely used in the trade settlement
measurement of the tap water delivery volume, as supplied by the tap water supply
department to residents and industrial and commercial users.
4.2 Classification
According to the working principle and structural characteristics of the water meter, it
can generally be divided into.
5 Metering performance requirements
5.1 Flow characteristics of water meters
5.1.1 The flow characteristics of water meters shall be determined according to the
values of Q1, Q2, Q3, Q4.
5.1.5 The ratio Q2/Q1 is 1.6.
5.1.6 The ratio Q4/Q3 is 1.25.
5.2 Accuracy level and maximum allowable error
5.2.1 The accuracy level of water meters is divided into level 1 and level 2.The
maximum allowable error of water meters with different accuracy levels at different
working temperatures shall comply with the provisions of Table 4.
5.2.2 If all indication errors of the water meter have the same sign, at least one of the
indication errors shall not exceed 1/2 of the maximum allowable error.
6 General technical requirements
6.1 Appearance, sign, seal
6.1.1 Appearance
6.1.2 Sign
6.1.2.1 Measurement legal sign
The water meter shall be marked with the type approval sign and number of the
measuring instrument in a prominent position.
6.1.2.2 Marking of measuring instruments
The water meter shall clearly and permanently indicate the following information on
the housing, the dial or nameplate of the indicating device, the inseparable cover, either
centrally or dispersedly.
6.1.3 Seal
6.1.3.1 The water meter shall have a protective device with a seal or a closed structure,
to ensure that before and after correct installation of water meter, it cannot disassemble
or change the water meter and its adjustment device, correction device, related
measuring instruments, without damaging the protective device or the seal of the
protective device. The verification sign and protective seal of the water meter shall be
applied to the part that can be seen without opening or disassembling the water meter.
6.2 Functions of electronic devices
6.2.1 For water meters with electronic devices, it shall explain various functions related
to user use and operation in the instruction manual and other accompanying documents.
The modifiable parameters stored in the electronic device that affect the measurement
results, such as sensor coefficient, instrument coefficient, signal equivalent, correction
coefficient, etc., shall be available on the nameplate or accompanying documents of the
water meter and related measuring instruments.
6.3 Tightness
6.3.1 Newly manufactured water meters shall be able to withstand a tightness test of
1.6 MAP for 1 min without seepage, leaking or damage.
6.3.2 Water meters in use shall not leak under working conditions.
7 Measuring instrument control
Measuring instrument control includes initial verification, subsequent verification, and
in-use inspection.
7.1 Verification conditions
7.1.1 Measuring standards and supporting equipment
7.3 Verification method
7.3.1 Inspection of appearance, sign, seal
7.3.1.1 Carry out visual inspection for the appearance of the water meter; it shall comply
with the provisions of 6.1.1.
7.3.1.2 Carry out visual inspection for the sign of the water meter; it shall comply with
the provisions of 6.1.2.
7.3.1.3 Carry out visual inspection for the protective device and seal of the water meter.
7.3.4 Verification of indication error
7.3.4.1 Verification flow point
The verification flow points of the water meter are generally Q1, Q2, Q3, adding 1.1Qx2
for combination water meters. If the additional verification flow point is indicated in
the accompanying documents of the water meter, this flow point shall also be added.
7.3.4.3 Verification signal
If the mechanical water meter contains a component that can be quickly verified, the
verification function of the component can be used, to connect an external sensor to
provide a verification signal.
7.5 Verification cycle
7.5.1 For water meters which have a nominal diameter of DN50 or less and Q3 not
greater than 16 m3/h, only the first mandatory verification before installation is carried
out; the meter is used within a limited period of time and replaced upon expiration. The
service life is stipulated as follows.
7.5.2 The verification cycle of water meters, which have a nominal diameter exceeding
DN50 or a Q3 exceeding 16 m3/h, is generally 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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