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JJF 1547-2015: Calibration Specification for On-line pH Meters
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| JJF 1547-2015 | English | 459 |
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Calibration Specification for On-line pH Meters
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JJF 1547-2015
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Basic data | Standard ID | JJF 1547-2015 (JJF1547-2015) | | Description (Translated English) | Calibration Specification for On-line pH Meters | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A61 | | Classification of International Standard | 17.020 | | Word Count Estimation | 20,226 | | Date of Issue | 2015-08-24 | | Date of Implementation | 2015-11-24 | | Quoted Standard | ASTM D5128-2009 | | Regulation (derived from) | AQSIQ Announcement 2015 No.106 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard is applicable to the calibration of an on-line pH meter with an electrode method for measuring the pH of water with a conductivity greater than 100 ��S �� cm-1. | JJF 1547-2015: Calibration Specification for On-line pH Meters---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for On-line pH Meters
People's Republic of China National Metrology Technical Specifications
Online pH meter calibration specification
Issued on. 2015-08-24
2015-11-24 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Online pH meter calibration specification
On-linepHMeters
Focal point. the National Technical Committee on Physical stoichiometric online chemical analysis instruments
Technical Committee
The main drafting units. China Institute of Metrology
China Testing Technology Research Institute
Shandong Province Institute of Metrology
Participated in the drafting unit. Guangxi Institute of measurement testing
State Power Institute of Science and Technology
Jiangsu Power Technology Co., Ltd., days
This specification stoichiometric commissioned the National Technical Committee of physical chemical analysis instruments online at the Technical Committee
Members will be responsible for interpreting
The main drafters of this specification.
Repair Hongyu (China Institute of Metrology)
Yuan Li (China Testing Technology Research Institute)
Gobo (Shandong Province Institute of Metrology)
Drafters participate.
Feng Shaobo (Guangxi Institute of measurement detection)
Zheng (State Power Institute of Science and Technology)
HU Guo Zhang (Jiangsu Power Technology Co., Ltd., days)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2. References (1)
3 Terms (1)
3.1 liquid junction potential (1)
3.2 streaming potential (1)
4 Overview (1)
5 Metrological characteristics (2)
Calibration Condition 6 (2)
6.1 environmental conditions (2)
6.2 standard solution and a constant temperature of the electrode system (3)
6.3 standards and other measuring equipment (3)
7 calibration items and calibration methods (3)
7.1 Check the electrode (3)
PH 7.2 electricity meter indication error (3)
7.3 meter electric voltage indication error (4)
7.4 input current (4)
Enter pH 7.5 Indication error due to the resistance (4)
pH 7.6 Indication error caused by temperature compensator (4)
7.7 Temperature indication error (5)
PH 7.8 Instrument indication error and Repeatability (5)
7.9 Indication Instruments pH stability (5)
8 calibration results expression (5)
9 Recalibration interval (6)
Appendix A Evaluation of Uncertainty instrument error of indication (7)
Appendix B Calibration original record format (Reference) (10)
Appendix C calibration certificate (within the page) format (reference) (14)
Introduction
This specification according JJF 1071-2010 "National Calibration Specifications writing rules" requirement be written.
Standard Test Method ASTM D5128-2009-line measurement of pH in low conductivity water (StandardTest
MethodforOn-LinepH MeasurementofWaterofLowConductivity) to water conductivity
100μS · cm-1 for the sector, will be divided into two-line pH meter monitor normal water pH and low conductivity water pH. Is
Conductivity measuring different solution, online pH meter calibration method may be different. This specification does not apply to low-power monitoring
Conductivity pH of the water-line pH meter.
This specification is the first release.
Online pH meter calibration specification
1 Scope
This instruction applies to measure the conductivity greater than 100μS · cm-1 water quality of pH electrode method using online pH meter
calibration.
2. References
This specification refers to the following documents.
Standard Test Method for ASTMD5128-2009 line measurement of pH in low conductivity water (StandardTest
MethodforOn-LinepH MeasurementofWaterofLowConductivity)
For dated references, only the dated edition applies to this specification; undated reference documents
Member, the latest edition (including any amendments) applies to this specification.
3 Terms
3.1 liquid junction potential liquidjunctionpotential
When two different electrolyte solution in contact with the liquid junction region, the high concentration of ions from one side to the rich
Of the lower side of the spread. Solution diffusion coefficient of various positive and negative ions different diffusion rates are different, resulting in industry
Electric potential difference generated on both sides.
3.2 streaming potential streamingpotential
When the electrolyte solution in a flow of charged insulating surface, the electric double layer surface free of charged particles along the
The solution flow direction. These movements cause charged particles downstream of the accumulation of charge, so that between the upstream and downstream production
Raw potential difference.
4 Overview
Online pH meter (hereinafter referred to as instruments) are widely used in field operations, and process conditions at the production site of continuous monitoring
Water pH value, usually by a pH meter electrical system (secondary instrument systems) and pH electrode system (sensor system) two
Part. Figure 1 is its structure diagram. Instrument electrode system in two basic designs. one is immersed for
Measuring pH measuring reaction tank, reaction tank, etc. stationary water quality; another way for the flow-through, for the water flowing through a pipe
Quality pH measurement. Line pH meter, electrode system measuring the flow of water quality should be grounded, and the use of stainless steel flow
Pool to reduce the impact of the flow potential.
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