JJG 376-2007 PDF English
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| JJG 376-2007 | English | 150 |
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Verification Regulation of Electrolytic Conductivity Meters
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| JJG 376-1985 | English | 399 |
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Verification Regulation for Electrolytic Conductance Meter
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JJG 376-2007: Verification Regulation of Electrolytic Conductivity 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/JJG376-2007
JJG
National Metrological Verification Procedures
of the People's Republic of China
Electrolytic Conductivity Meters
Issued on. NOVEMBER 21, 2007
Implemented on. MAY 21, 2008
Issued by. State Administration of Quality Supervision, Inspection and
Quarantine
Verification Regulation of
Electrolytic Conductivity Meters
This regulation was approved by the State Administration of Quality Supervision,
Inspection and Quarantine on November 21, 2007, and was put into effect on May 21,
2008.
Administrative organization. National Physical and Chemical Metrology Technical
Committee
Drafting organization. China Institute of Metrology
This regulation entrusts the National Physical and Chemical Metrology Technical
Committee for interpretation
Main drafter of this regulation.
Xiaoping Song (China Institute of Metrology)
Participating drafters.
Kan Ying (China Institute of Metrology)
Wang Hai (China Institute of Metrology)
JJG 376-2007 Corrigendum
Page 3 Row 8, Column 6 in Table 1.The value “±0.2” shall be “±2.0”.
Page 4 Penultimate line 4.The value “0.25” shall be “0.25%”.
Replacing JJG 376-1985
Table of Contents
1 Scope... 4
2 Normative references... 4
3 Terminology and measuring unit... 4
4 Overview... 6
5 Measuring performance requirements... 6
5.1 The electronic unit repeatability... 6
5.2 Electronic unit cited error... 6
5.3 Indication error of conductance cell’s constant... 6
5.4 Indication error of temperature coefficient... 6
5.5 Indication error of temperature measurement... 6
5.6 Instrument cited error... 6
5.7 Repetitiveness of Instrument... 7
6 General technical requirements... 7
7 Control of measuring instruments... 7
7.1 Verification conditions... 7
7.2 Verification items... 9
7.3 Verification method... 9
7.4 Processing of verification results... 14
7.5 Verification period... 14
Appendix A Conductivity standard solution concentration and its conductivity
value... 15
Appendix B Example of electrolytic conductivity meter calibration record... 16
Appendix C Example of inner page format of verification certificate... 21
Verification Regulation of Electrolytic Conductivity Meters
1 Scope
This regulation applies to the first-time verification, subsequent verification, and in-use
inspection of electrolytic conductivity meters. Calibration of resistivity meter, salinity meter
based on the electrical conductivity measurement principle, and TDS measurement
instrument can reference to this regulation.
2 Normative references
OIML R68 Edition 1985 Calibration method for conductivity cell
BS EN 60746-3.2002 Expression of performance of electrochemical analyzers - Part 3.
3 Terminology and measuring unit
3.1 Electrolytic conductance
The ratio of current and electric potential difference when ionic charge of conductivity cell
moves in the electrolyte solution.
3.3 Cell constant
Conductance cell constant is calculated by the formula (3).
3.4 Temperature coefficient
The relative change of the conductivity of the electrolyte solution that is caused by
temperature change of 1 °C. For strong electrolyte whose electrical conductivity is greater
than 1 x 10-4 S·m-1, the temperature coefficient α can be approximately expressed by
Formula (5).
4 Overview
Conductivity meter is used to measure the electrolyte solution conductivity. The
measuring principle of conductivity meter is based on the relationship [formula (4)] of
conductivity, electric conductance, and conductance cell’s constant. Apply
alternating electrical signals between electrodes of conductance cell to measure the
solution conductivity; obtain the conductivity according to the imputed conductance cell’s
constant.
5 Measuring performance requirements
5.1 The electronic unit repeatability
Verification results shall comply with the provisions of Table 1.
5.2 Electronic unit cited error
Verification results shall comply with the provisions of Table 1.
5.3 Indication error of conductance cell’s constant
Verification results shall comply with the provisions of Table 1.
6 General technical requirements
Instrument appearance shall be bright, clean and flat. Instrument function keys shall be
able to work properly. All fasteners shall not be loose. The indication of instrument panel
shall be clear and intact. Digital display instrument shall be clear and complete.
7 Control of measuring instruments
Control of measuring instruments includes first-time verification, subsequent verification
and in-use inspection.
7.1 Verification conditions
7.1.1 Environmental conditions
Verification results shall comply with the provisions of Table 2.
7.1.2 Solution conductance simulator
It is the standard device for verifying electronic unit’s metrological performance. It is
consisted of a set of non-inductive a.c. (alternate current) resistance. Setting of resistance
value shall be able to meet the requirements of "verification method".
7.1.3 Conductivity standard solution
The relative uncertainty of reference value of standard solution used in verification shall
be less than or equal to 0.25 0.25% (k = 2). Potassium chloride solution conductivity
standard material may be used. It may also use KCl conductivity solid standard material
prepared according to the provisions of the appendix.
7.3.8 Instrument repeatability
Repeatedly measure standard solution 1 or standard solution 2 for 6 times. Calculate the
ratio of single-measurement standard deviation AND full-range according to Formula (6).
It represents the repeatability of instrument measurement results.
7.4 Processing of verification results
After verification, the instrument complying with this regulation is deemed as qualified
instrument. A verification certificate shall be issued. The certificate shall provide each
item’s verification result and the instrument level. The instrument at certain level shall
meet the requirements of all metrological performance of that level. If some range can not
meet the requirements, it shall indicate the limitation range. If the instrument is not
qualified, a notice of verification result shall be issued.
7.5 Verification period
The verification period generally shall not be more than a year.
JJG 376-2007
JJG
National Metrological Verification Procedures
of the People's Republic of China
Electrolytic Conductivity Meters
Issued on. NOVEMBER 21, 2007
Implemented on. MAY 21, 2008
Issued by. State Administration of Quality Supervision, Inspection and
Quarantine
Verification Regulation of
Electrolytic Conductivity Meters
This regulation was approved by the State Administration of Quality Supervision,
Inspection and Quarantine on November 21, 2007, and was put into effect on May 21,
2008.
Administrative organization. National Physical and Chemical Metrology Technical
Committee
Drafting organization. China Institute of Metrology
This regulation entrusts the National Physical and Chemical Metrology Technical
Committee for interpretation
Main drafter of this regulation.
Xiaoping Song (China Institute of Metrology)
Participating drafters.
Kan Ying (China Institute of Metrology)
Wang Hai (China Institute of Metrology)
JJG 376-2007 Corrigendum
Page 3 Row 8, Column 6 in Table 1.The value “±0.2” shall be “±2.0”.
Page 4 Penultimate line 4.The value “0.25” shall be “0.25%”.
Replacing JJG 376-1985
Table of Contents
1 Scope... 4
2 Normative references... 4
3 Terminology and measuring unit... 4
4 Overview... 6
5 Measuring performance requirements... 6
5.1 The electronic unit repeatability... 6
5.2 Electronic unit cited error... 6
5.3 Indication error of conductance cell’s constant... 6
5.4 Indication error of temperature coefficient... 6
5.5 Indication error of temperature measurement... 6
5.6 Instrument cited error... 6
5.7 Repetitiveness of Instrument... 7
6 General technical requirements... 7
7 Control of measuring instruments... 7
7.1 Verification conditions... 7
7.2 Verification items... 9
7.3 Verification method... 9
7.4 Processing of verification results... 14
7.5 Verification period... 14
Appendix A Conductivity standard solution concentration and its conductivity
value... 15
Appendix B Example of electrolytic conductivity meter calibration record... 16
Appendix C Example of inner page format of verification certificate... 21
Verification Regulation of Electrolytic Conductivity Meters
1 Scope
This regulation applies to the first-time verification, subsequent verification, and in-use
inspection of electrolytic conductivity meters. Calibration of resistivity meter, salinity meter
based on the electrical conductivity measurement principle, and TDS measurement
instrument can reference to this regulation.
2 Normative references
OIML R68 Edition 1985 Calibration method for conductivity cell
BS EN 60746-3.2002 Expression of performance of electrochemical analyzers - Part 3.
3 Terminology and measuring unit
3.1 Electrolytic conductance
The ratio of current and electric potential difference when ionic charge of conductivity cell
moves in the electrolyte solution.
3.3 Cell constant
Conductance cell constant is calculated by the formula (3).
3.4 Temperature coefficient
The relative change of the conductivity of the electrolyte solution that is caused by
temperature change of 1 °C. For strong electrolyte whose electrical conductivity is greater
than 1 x 10-4 S·m-1, the temperature coefficient α can be approximately expressed by
Formula (5).
4 Overview
Conductivity meter is used to measure the electrolyte solution conductivity. The
measuring principle of conductivity meter is based on the relationship [formula (4)] of
conductivity, electric conductance, and conductance cell’s constant. Apply
alternating electrical signals between electrodes of conductance cell to measure the
solution conductivity; obtain the conductivity according to the imputed conductance cell’s
constant.
5 Measuring performance requirements
5.1 The electronic unit repeatability
Verification results shall comply with the provisions of Table 1.
5.2 Electronic unit cited error
Verification results shall comply with the provisions of Table 1.
5.3 Indication error of conductance cell’s constant
Verification results shall comply with the provisions of Table 1.
6 General technical requirements
Instrument appearance shall be bright, clean and flat. Instrument function keys shall be
able to work properly. All fasteners shall not be loose. The indication of instrument panel
shall be clear and intact. Digital display instrument shall be clear and complete.
7 Control of measuring instruments
Control of measuring instruments includes first-time verification, subsequent verification
and in-use inspection.
7.1 Verification conditions
7.1.1 Environmental conditions
Verification results shall comply with the provisions of Table 2.
7.1.2 Solution conductance simulator
It is the standard device for verifying electronic unit’s metrological performance. It is
consisted of a set of non-inductive a.c. (alternate current) resistance. Setting of resistance
value shall be able to meet the requirements of "verification method".
7.1.3 Conductivity standard solution
The relative uncertainty of reference value of standard solution used in verification shall
be less than or equal to 0.25 0.25% (k = 2). Potassium chloride solution conductivity
standard material may be used. It may also use KCl conductivity solid standard material
prepared according to the provisions of the appendix.
7.3.8 Instrument repeatability
Repeatedly measure standard solution 1 or standard solution 2 for 6 times. Calculate the
ratio of single-measurement standard deviation AND full-range according to Formula (6).
It represents the repeatability of instrument measurement results.
7.4 Processing of verification results
After verification, the instrument complying with this regulation is deemed as qualified
instrument. A verification certificate shall be issued. The certificate shall provide each
item’s verification result and the instrument level. The instrument at certain level shall
meet the requirements of all metrological performance of that level. If some range can not
meet the requirements, it shall indicate the limitation range. If the instrument is not
qualified, a notice of verification result shall be issued.
7.5 Verification period
The verification period generally shall not be more than a year.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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