JJG 577-2012 PDF English
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JJG 577-2012: Verification Regulation of Diaphragm Gas 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/JJG577-2012
JJG
NATIONAL METROLOGY VERIFICATION REGULATION
Diaphragm gas meters
Issued on. SEPTEMBER 03, 2012
Implemented on. MARCH 03, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
Verification regulation of diaphragm gas meters
Replacing the main text of
JJG 577-2005 regulation
Under the jurisdiction of.
National Flow Capacity Measurement Technical Committee
Main drafting organizations.
Beijing Institute of Metrology and Measurement Science
Chongqing Institute of Metrology and Quality Inspection
Participated drafting organizations.
Zhejiang Institute of Metrology
Chongqing Qianwei Krom Meter Industry Co., Ltd.
Dandong Thermal Instrument Co., Ltd.
Chongqing Shancheng Gas Equipment Co., Ltd.
For this regulation, the National Flow Capacity Measurement Technical
Committee is entrusted for interpretation.
The main drafters of this regulation.
Yang Youtao (Beijing Institute of Metrology and Measurement Science)
Liao Xin (Chongqing Institute of Metrology and Quality Inspection)
Participated drafters.
Jin Lan (Zhejiang Institute of Metrology)
Tang Lei (Beijing Institute of Metrology and Measurement Science)
Chen Hailin (Chongqing Qianwei Krom Meter Industry Co., Ltd.)
Sun Xiaodong (Dandong Thermal Instrument Co., Ltd.)
Xu Yizhou (Chongqing Shancheng Gas Equipment Co., Ltd.)
Table of Contents
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Terms and metering units... 5
3.1 Terminology... 5
3.2 Unit of measurement... 7
4 Overview... 7
4.1 Principle and structure... 7
4.2 Use... 8
5 Metrological performance requirements... 8
6 General technical requirements... 8
6.1 Nameplates and markings... 8
6.2 Appearance... 9
6.3 Flow-rate range... 9
6.4 Indicating device... 10
6.5 Sealing... 10
6.6 Pressure loss... 10
6.7 Ancillary devices... 11
6.8 Safety performance... 11
7 Metering instrument control... 11
7.1 Verification conditions... 11
7.2 Verification item... 12
7.3 Verification method... 13
7.4 Processing of verification results... 18
7.5 Verification cycle... 18
Appendix A Functional testing of gas meter ancillary device... 19
Appendix B Information and format of verification certificate/verification result
notice inside page... 21
1 Scope
This regulation is applicable to the first verification, subsequent verification and
in-use inspection of diaphragm gas meters (hereinafter referred to as gas
meters).
2 Normative references
This regulation refers to the following documents.
JJF 1001-2011 General terms in metrology and their definitions
GB/T 6968-2011 Diaphragm gas meters
OIML R137-1&2.2012 Gas meters
OIML D11.2004 General requirements for electronic measuring instruments
EN 1359.1998 + A1.2006 Diaphragm gas meters
For dated references, only the dated version applies to this regulation; for
undated references, the latest version (including all amendments) applies to
this regulation.
3 Terms and metering units
3.1 Terminology
3.2 Unit of measurement
Volume unit. cubic meter, symbol m3; liter, symbol L; cubic decimeter, symbol
dm3.
4 Overview
4.1 Principle and structure
The gas meter is a volumetric gas flow meter that uses a flexible diaphragm
metering chamber to measure gas volume flow. Under the action of the
pressure difference, the gas is alternately entered into the metering chamber
through the distribution valve, and is filled to the gas outlet after being filled fully.
At the same time, the flexible diaphragm in the metering chamber is pushed to
reciprocate, and the circulation process of the inflation and exhaust is converted
into the corresponding gas volume flow by the conversion mechanism.
4.1.1 Anti-reverse device
The gas meter shall be equipped with means to prevent reversal. When the gas
inflow direction is opposite to the specified flow direction, the gas meter shall
be able to stop the metering or reverse counting is prohibited.
4.2 Use
The gas meter is mainly used to measure the cumulative volume flow of gas, it
is widely used in gas metering applications for civil and industrial and
commercial applications.
5 Metrological performance requirements
The accuracy grade of the gas meter is 1.5, the indication error shall meet the
requirements of Table 1.
6 General technical requirements
6.1 Nameplates and markings
The nameplate or body of the gas meter shall be marked of the following.
6.2 Appearance
The newly manufactured gas meter outer casing shall be evenly coated, there
shall be no blisters, falling off, scratches, etc. Counters and markings shall be
legible and mechanical seals shall be sound and reliable. Gas meter operation
shall be stable, and it is not allowed to affect the metering performance and
obvious intermittent pause.
6.3 Flow-rate range
The flow-rate range value of the gas meter shall comply with the requirements
of Table 2.
6.4 Indicating device
The counter shall meet the requirement that the cumulative flow of the gas
meter shall work for 6000 hours at the maximum flow-rate without returning to
zero.
6.5 Sealing
The gas meter must be tested for tightness and input 1.5 times the maximum
operating pressure for a duration of not less than 3 minutes. The gas meter
must not leak.
6.6 Pressure loss
The maximum allowable value of gas meter pressure loss shall not exceed the
requirements of Table 4.
6.7 Ancillary devices
If the gas meter is equipped with an ancillary device, its metering performance
shall meet the requirements of clause 5.The function of the gas meter with
ancillary device shall meet the corresponding functional testing requirements in
Appendix A.
7 Metering instrument control
The metering instrument control includes the first verification, subsequent
verification and in-use inspection of the gas meter.
7.1 Verification conditions
7.1.5 During the verification process, the difference between the temperature
at the standard device and the temperature at the gas meter (including room
temperature, standard device liquid temperature, and verification medium
temperature) shall not exceed 1 °C.
7.1.6 The verification medium is generally air.
7.1.7 The verification pressure shall not exceed the maximum operating
pressure of the gas meter, and the verification system shall not leak air.
7.2 Verification item
The items for the first verification, subsequent verification and in-use inspection
are as shown in Table 6.
7.3 Verification method
7.3.1 Appearance
The appearance of routine inspection of gas meters shall comply with the
requirements of 6.1, 6.2, 6.3 and 6.4 of clause 6 "General technical
requirements" of this regulation.
7.3.4.5 The arbitration dynamics method is preferred for arbitration verification.
7.3.5 Refer to Appendix A for functional testing of gas meters equipped with
ancillary devices.
7.4 Processing of verification results
The qualified gas meter shall be issued with the verification certificate or
attached with the verification qualified mark (or seal mark); the unqualified gas
meter shall be issued with the verification result notice, and the unqualified item
shall be indicated.
7.5 Verification cycle
7.5.1 For the maximum flow-rate qmax ≤ 10 m3/h and the gas meter used for
trade settlement, only the first mandatory verification is performed, it is used
within the specified time period, and replaced when it is expired.
7.5.2 For the gas meter with a maximum flow-rate qmax ≥ 16 m3/h, the calibration
cycle is generally not more than 3 years.
Appendix A
Functional testing of gas meter ancillary device
For gas meters equipped with ancillary devices, it is necessary to perform tests
in accordance with the product specifications and the functions that the product
can achieve (without destroying the seal).
A.1 Functional testing can be performed under non-calibrated conditions. The
gas meters with ancillary devices shall generally have the following prompt
functions.
A.1.1 Operating power supply undervoltage
When the gas meter operating power supply is under voltage, it shall have clear
text symbol, sound and light alarm, close control valve and so on.
A.1.2 Mis-operation
When the gas meter encounters an incorrect operation, it shall be prompted by
one or more ways, such as text symbol, sound and light alarm, to close the
control valve or maintain the original operating state.
A.2 Gas meters with pre-payment functions must have the following control
functions.
JJG 577-2012
JJG
NATIONAL METROLOGY VERIFICATION REGULATION
Diaphragm gas meters
Issued on. SEPTEMBER 03, 2012
Implemented on. MARCH 03, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
Verification regulation of diaphragm gas meters
Replacing the main text of
JJG 577-2005 regulation
Under the jurisdiction of.
National Flow Capacity Measurement Technical Committee
Main drafting organizations.
Beijing Institute of Metrology and Measurement Science
Chongqing Institute of Metrology and Quality Inspection
Participated drafting organizations.
Zhejiang Institute of Metrology
Chongqing Qianwei Krom Meter Industry Co., Ltd.
Dandong Thermal Instrument Co., Ltd.
Chongqing Shancheng Gas Equipment Co., Ltd.
For this regulation, the National Flow Capacity Measurement Technical
Committee is entrusted for interpretation.
The main drafters of this regulation.
Yang Youtao (Beijing Institute of Metrology and Measurement Science)
Liao Xin (Chongqing Institute of Metrology and Quality Inspection)
Participated drafters.
Jin Lan (Zhejiang Institute of Metrology)
Tang Lei (Beijing Institute of Metrology and Measurement Science)
Chen Hailin (Chongqing Qianwei Krom Meter Industry Co., Ltd.)
Sun Xiaodong (Dandong Thermal Instrument Co., Ltd.)
Xu Yizhou (Chongqing Shancheng Gas Equipment Co., Ltd.)
Table of Contents
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Terms and metering units... 5
3.1 Terminology... 5
3.2 Unit of measurement... 7
4 Overview... 7
4.1 Principle and structure... 7
4.2 Use... 8
5 Metrological performance requirements... 8
6 General technical requirements... 8
6.1 Nameplates and markings... 8
6.2 Appearance... 9
6.3 Flow-rate range... 9
6.4 Indicating device... 10
6.5 Sealing... 10
6.6 Pressure loss... 10
6.7 Ancillary devices... 11
6.8 Safety performance... 11
7 Metering instrument control... 11
7.1 Verification conditions... 11
7.2 Verification item... 12
7.3 Verification method... 13
7.4 Processing of verification results... 18
7.5 Verification cycle... 18
Appendix A Functional testing of gas meter ancillary device... 19
Appendix B Information and format of verification certificate/verification result
notice inside page... 21
1 Scope
This regulation is applicable to the first verification, subsequent verification and
in-use inspection of diaphragm gas meters (hereinafter referred to as gas
meters).
2 Normative references
This regulation refers to the following documents.
JJF 1001-2011 General terms in metrology and their definitions
GB/T 6968-2011 Diaphragm gas meters
OIML R137-1&2.2012 Gas meters
OIML D11.2004 General requirements for electronic measuring instruments
EN 1359.1998 + A1.2006 Diaphragm gas meters
For dated references, only the dated version applies to this regulation; for
undated references, the latest version (including all amendments) applies to
this regulation.
3 Terms and metering units
3.1 Terminology
3.2 Unit of measurement
Volume unit. cubic meter, symbol m3; liter, symbol L; cubic decimeter, symbol
dm3.
4 Overview
4.1 Principle and structure
The gas meter is a volumetric gas flow meter that uses a flexible diaphragm
metering chamber to measure gas volume flow. Under the action of the
pressure difference, the gas is alternately entered into the metering chamber
through the distribution valve, and is filled to the gas outlet after being filled fully.
At the same time, the flexible diaphragm in the metering chamber is pushed to
reciprocate, and the circulation process of the inflation and exhaust is converted
into the corresponding gas volume flow by the conversion mechanism.
4.1.1 Anti-reverse device
The gas meter shall be equipped with means to prevent reversal. When the gas
inflow direction is opposite to the specified flow direction, the gas meter shall
be able to stop the metering or reverse counting is prohibited.
4.2 Use
The gas meter is mainly used to measure the cumulative volume flow of gas, it
is widely used in gas metering applications for civil and industrial and
commercial applications.
5 Metrological performance requirements
The accuracy grade of the gas meter is 1.5, the indication error shall meet the
requirements of Table 1.
6 General technical requirements
6.1 Nameplates and markings
The nameplate or body of the gas meter shall be marked of the following.
6.2 Appearance
The newly manufactured gas meter outer casing shall be evenly coated, there
shall be no blisters, falling off, scratches, etc. Counters and markings shall be
legible and mechanical seals shall be sound and reliable. Gas meter operation
shall be stable, and it is not allowed to affect the metering performance and
obvious intermittent pause.
6.3 Flow-rate range
The flow-rate range value of the gas meter shall comply with the requirements
of Table 2.
6.4 Indicating device
The counter shall meet the requirement that the cumulative flow of the gas
meter shall work for 6000 hours at the maximum flow-rate without returning to
zero.
6.5 Sealing
The gas meter must be tested for tightness and input 1.5 times the maximum
operating pressure for a duration of not less than 3 minutes. The gas meter
must not leak.
6.6 Pressure loss
The maximum allowable value of gas meter pressure loss shall not exceed the
requirements of Table 4.
6.7 Ancillary devices
If the gas meter is equipped with an ancillary device, its metering performance
shall meet the requirements of clause 5.The function of the gas meter with
ancillary device shall meet the corresponding functional testing requirements in
Appendix A.
7 Metering instrument control
The metering instrument control includes the first verification, subsequent
verification and in-use inspection of the gas meter.
7.1 Verification conditions
7.1.5 During the verification process, the difference between the temperature
at the standard device and the temperature at the gas meter (including room
temperature, standard device liquid temperature, and verification medium
temperature) shall not exceed 1 °C.
7.1.6 The verification medium is generally air.
7.1.7 The verification pressure shall not exceed the maximum operating
pressure of the gas meter, and the verification system shall not leak air.
7.2 Verification item
The items for the first verification, subsequent verification and in-use inspection
are as shown in Table 6.
7.3 Verification method
7.3.1 Appearance
The appearance of routine inspection of gas meters shall comply with the
requirements of 6.1, 6.2, 6.3 and 6.4 of clause 6 "General technical
requirements" of this regulation.
7.3.4.5 The arbitration dynamics method is preferred for arbitration verification.
7.3.5 Refer to Appendix A for functional testing of gas meters equipped with
ancillary devices.
7.4 Processing of verification results
The qualified gas meter shall be issued with the verification certificate or
attached with the verification qualified mark (or seal mark); the unqualified gas
meter shall be issued with the verification result notice, and the unqualified item
shall be indicated.
7.5 Verification cycle
7.5.1 For the maximum flow-rate qmax ≤ 10 m3/h and the gas meter used for
trade settlement, only the first mandatory verification is performed, it is used
within the specified time period, and replaced when it is expired.
7.5.2 For the gas meter with a maximum flow-rate qmax ≥ 16 m3/h, the calibration
cycle is generally not more than 3 years.
Appendix A
Functional testing of gas meter ancillary device
For gas meters equipped with ancillary devices, it is necessary to perform tests
in accordance with the product specifications and the functions that the product
can achieve (without destroying the seal).
A.1 Functional testing can be performed under non-calibrated conditions. The
gas meters with ancillary devices shall generally have the following prompt
functions.
A.1.1 Operating power supply undervoltage
When the gas meter operating power supply is under voltage, it shall have clear
text symbol, sound and light alarm, close control valve and so on.
A.1.2 Mis-operation
When the gas meter encounters an incorrect operation, it shall be prompted by
one or more ways, such as text symbol, sound and light alarm, to close the
control valve or maintain the original operating state.
A.2 Gas meters with pre-payment functions must have the following control
functions.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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