Search result: JJG 814-2015 (JJG 814-1993 Older version)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 814-2015 | English | 509 |
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Verification Regulation of Automatic Potentiometric Titrators
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JJG 814-2015
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| JJG 814-1993 | English | 559 |
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Verification Regulation of Automatic Potentiometric Titrator
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JJG 814-1993
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| Standard ID | JJG 814-2015 (JJG814-2015) | | Description (Translated English) | Verification Regulation of Automatic Potentiometric Titrators | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A55 | | Classification of International Standard | 17.020 | | Word Count Estimation | 21,219 | | Date of Issue | 2015-01-30 | | Date of Implementation | 2015-07-30 | | Older Standard (superseded by this standard) | JJG 814-1993 | | Regulation (derived from) | The State Administration of Quality Supervision, Inspection and Quarantine Announcement 2015 No. 19 | | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine | | Summary | This Standard applies to automatic potentiometric titrator initial verification, subsequent verification and the use of checks. |
JJG 814-2015
Verification Regulation of Automatic Potentiometric Titrators
State verification procedures People's Republic of China
Automatic potentiometric titrator
Issued on. 2015-01-30
2015-07-30 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Automatic potentiometric titrator verification procedures
Replacing JJG 814-1993
Focal point. the National Technical Committee stoichiometric physical
The main drafting units. School of Guizhou Province Measurement and Testing
China Institute of Metrology
Jiangxi Institute of Metrology
Participated in the drafting unit. Shanghai Institute of Measurement and Testing
Shanghai Electronics Science Instrument Co., Ltd.
This procedure commissioned the National Technical Committee of the stoichiometric physics responsible for the interpretation
The main drafters of this procedure.
MAO (Guizhou Province Measurement and Testing Institute)
Repair Hongyu (China Institute of Metrology)
Yang Yu Zhe (Jiangxi Institute of Measurement and Testing)
Drafters participate.
Guo Shuqiang (Guizhou Province Measurement and Testing Institute)
Wangzhen Tao (Shanghai Institute of Measurement and Testing)
Kim Chun Law (Shanghai Electronics Science Instrument Co., Ltd.)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 Overview (1)
3 metering performance requirements (1)
4 General Requirements (2)
4.1 appearance and routine examination (2)
4.2 energizing check (2)
5 control of measuring instruments (2)
5.1 verification Conditions (2)
5.2 test items and test methods (3)
5.3 Verification Results Processing (6)
5.4 test cycle (6)
Appendix A test segment burette (7)
Appendix B Common Glass Container Measurement Approach K (t) value table (8)
Appendix C test original record format (10)
Appendix D calibration certificate/test results in the notice page format pattern (13)
introduction
The procedure according to JJF1002-2010 "national verification procedures to write the rules," to write, and
JJG 814-1993 compared to, in addition to editorial changes, the major technical changes are as follows.
--- Increased contents Introduction;
--- Original statutes "electricity meter reference repeatability errors, potential electricity meter, Burette capacity Tolerance, titration analysis
Repeatability "project name was changed to" electricity meter indication error, electricity meter Repeatability, Buret capacity error, equipment
Repeatability ";
--- Modify the calculation method of "electric meter Repeatability" (see 5.2.2.4);
--- Modify the content verification of environmental conditions (see 5.1.1);
--- Cancel the test standard is the "high impedance DC potentiometer, standard battery and a galvanometer and other components of the standard
Verification device "will" or with the same accuracy DC potential Calibrator "was changed to" pH Calibrator. accuracy class
0.0006; "(see 5.1.3);
--- Added "certified reference material" requirements (see 5.1.4);
--- Increased the list of test items (see Table 3);
--- Cancel the original statutes "instrument control titration sensitivity" of technical indicators;
--- Modified "Buret capacity error," the test methods (see 5.2.2.7);
--- Added "instrument indication error" technical indicators and test methods (see 5.2.2.8);
--- Original statutes "potentiometric titration instrument repeatability test" and "instrument and titration repeatability test"
Merge, modify the "Instrument Repeatability" and modified its test method (see 5.2.2.8);
--- Added "common method to measure Glass Container K (t) value table" (see Appendix B);
--- Modify the "verification original record format" appendix (Appendix C);
--- Cancel the original statutes "verification certificate" appendix, from "test certificate/test results in the notice page format
Shape "Appendix D instead.
The regulations previously issued as follows.
--- JJG 814-1993.
Automatic potentiometric titrator verification procedures
1 Scope
The order applies to automatic potentiometric titrator initial verification, use and subsequent verification check.
2 Overview
Automatic potentiometric titrator (hereinafter referred to as equipment) is based on the principle of potentiometric titration designed for a capacity analysis
Kinds of analytical instruments.
Potentiometric titration principle is. the choice of appropriate indicator electrode and a reference electrode and the measured ratio of the solution to form a working electrode
Pool, with the addition of titrant, as a result of a chemical reaction, the concentration of the measured ion is changing, thus indicating
The electrode potential changes. Near the end of the titration, ion concentration measured mutation causing sudden electrode potential
jump. Thus, according to the projection electrode potential jump can determine the endpoint. It is the potentiometric titration curve, A point shown in Figure 1
The endpoint of the titration.
1 a schematic diagram of potentiometric titration curve
Instruments distributor gauge system titration system and electrode system consists of three parts. Electricity meter system consists of potential amplification, control lines
Composition, by measuring the indicator electrode and the reference electrode between the ratio of signal processing, the automatic control system of the droplet titration
Fluid velocity, is determined after the end of the titration, the instrument automatically stops the titration. Titration system is divided into digital and scale burette two
Categories. Electrode system by the indicator electrode and the reference electrode.
3 metering performance requirements
Automatic titrator performance measurement requirements in Table 1, Table 2.
Table 1 List of instrument performance measurement
Instrument Level
Measurement of performance
Electricity meter shows the maximum value
Allowable error
% FS
Electricity meter indication
Repeatability
Enter the electricity meter
Electric current
Electricity meter input impedance
Instrument shows maximum value
Allowable error
Instrument indication
Repeatability
0.05 ± 0.05 ≤0.025 ≤1 × 10-12 ≥3 × 1012 ± 1.5 ≤0.2
......
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