JJG 631-2013_English: PDF (JJG631-2013)
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Verification Regulation of Ammonia-Nitrogen Automatic Analyzers
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JJG 631-2013
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JJG 631-2004 | English | 519 |
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Ammonia Analyzers
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JJG 631-2004
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JJG 631-1989 | English | 279 |
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Verification Regulation for Ammonia Automatic Monitor
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Standard ID | JJG 631-2013 (JJG631-2013) | Description (Translated English) | Verification Regulation of Ammonia-Nitrogen Automatic Analyzers | Sector / Industry | Metrology & Measurement Industry Standard | Classification of Chinese Standard | A61 | Classification of International Standard | 17.020 | Word Count Estimation | 17,144 | Older Standard (superseded by this standard) | JJG 631-2004 | Drafting Organization | Shanghai Institute of Measurement and Testing | Administrative Organization | National Technical Committee on Environment stoichiometric | Regulation (derived from) | AQSIQ Announcement No. 114, 2013 | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine | Summary | This standard applies to: electrode method and spectrophotometry automatic monitor on -line ammonia initial verification, testing and use of the follow-up examination. | Standard ID | JJG 631-2004 (JJG631-2004) | Description (Translated English) | Ammonia Analyzers | Sector / Industry | Metrology & Measurement Industry Standard | Classification of Chinese Standard | A61 | Classification of International Standard | 17 | Word Count Estimation | 13,161 | Date of Issue | 2004-03-02 | Date of Implementation | 2004-09-02 | Older Standard (superseded by this standard) | JJG 631-1989 | Drafting Organization | Shanghai Measurement and Testing Technology | Administrative Organization | National Environmental stoichiometric Technical Committee | Regulation (derived from) | Administration of Quality Supervision, Inspection and Quarantine No. 24 of 2004 | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine | Summary | This standard applies to automatic monitor ammonia (ammonia electrode method) of the initial verification, testing and use of follow-up inspection. | Standard ID | JJG 631-1989 (JJG631-1989) | Description (Translated English) | Verification Regulation for Ammonia Automatic Monitor | Sector / Industry | Metrology & Measurement Industry Standard | Classification of Chinese Standard | A61 | Word Count Estimation | 7,734 | Date of Issue | 1989/9/11 | Date of Implementation | 1990/10/1 | Regulation (derived from) | The State Administration of Quality Supervision, Inspection and Quarantine Notice 2004 No. 24 |
JJG 631-2013
JJG
National Metrological Verification Regulations
of the People’s Republic of China
Ammonia-Nitrogen Automatic Analyzers
ISSUED ON. AUGUST 15, 2013
IMPLEMENTED ON. FEBRUARY 15, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
Verification Regulation of
Ammonia-Nitrogen Automatic Analyzers
Replacing JJG 631-2004
Administrative organization.
National Environment Chemistry Metrology Technical Committee
Main Drafting organizations.
Shanghai Metrology and Testing Institute
Jiangsu Province Metrology Institute
Shanghai Electronics Scientific Instrument Co., Ltd.
National Environment Chemistry Metrology Technical Committee is entrusted
to be responsible for the explanation of this Regulation.
Main drafters of this Regulation.
Ding Min (Shanghai Metrology and Testing Institute)
Gong Feiyan (Shanghai Metrology and Testing Institute)
Xie Luyun (Shanghai Metrology and Testing Institute)
Participating drafters of this Regulation.
Cai Yeqiang (Jiangsu Province Metrology Institute)
Xing Jinjing (Jiangsu Province Metrology Institute)
Wang Qiaomei (Shanghai Electronics Scientific Instrument Co., Ltd.)
Table of Contents
Introduction ... 5
1 Scope ... 6
2 Overview ... 6
3 Measuring performance requirements ... 6
4 General technical requirements ... 7
5 Measuring instrument control ... 8
6 Processing of verification results ... 12
7 Verification cycle-time ... 12
Appendix A ... 13
Appendix B ... 14
Appendix C ... 17
Introduction
This regulation is the revision to JJG 631-2004 "Ammonia automatic analyzers”.
Compared with JJG 631-2004, in addition to editorial changes, the main
technical changes are as follows.
- Change the regulation’s name to "Ammonia-nitrogen automatic analyzers";
- The scope is extended from "applicable to ammonia automatic analyzers
(gas sensing electrode method)" to "applicable to online ammonia-nitrogen
automatic analyzers that is based on electrode method
and Spectrophotometry (see Article 1);
- Modify the instrument’s classification (see Article 3);
- Modify indicated value error’s performance requirements (see Table 1);
- Modify metrology device’s control requirements. Delete the requirements
to new ex-factory instruments that all requirements must be verified
according to Class A and Class B instruments (see Article 5);
- Modify the list of verification items in metrology device control. Add item
“response time” in “Use inspection” for electrode instrument (see Table 2);
- Modify the standard substances’ concentrations which are used for
verification of instrument’s indicated value error, stability, repeatability, and
response time (see Articles 5.3.2, 5.3.3, 5.3.4, 5.3.5);
- Modify the test result processing. Verification certificate is required to
provide the qualified category (see Article 6).
The historical version of JJG 631-2004 "Ammonia automatic analyzers" is.
- JJG 631-1989 "Ammonia automatic analyzers".
Ammonia-Nitrogen Automatic Analyzers
1 Scope
This regulation applies to initial verification, subsequent verification, and use
inspection of online ammonia-nitrogen automatic analyzers which is based on
electrode method and spectrophotometry.
2 Overview
Ammonia-nitrogen automatic analyzers can automatically and continuously
monitor the ammonia-nitrogen concentration in water bodies such as
groundwater, surface water, sewage, and industrial waste.
Measurement methods of ammonia-nitrogen automatic analyzers (hereinafter
referred to as the instrument) can be divided in electrode method and
spectrophotometry. Spectrophotometry includes salicylic acid
spectrophotometry and Nessler reagent spectrophotometry etc. Its principle is.
after ammonia or ammonium ions in water reacts with the indicator reagent, it
shows in color. At specific wavelength, the absorbance of the solution is
proportional to the ammonia-nitrogen content, so as to achieve the quantitative
analysis of ammonia-nitrogen in water sample. Electrode method includes gas-
sensitive electrode method and ammonia ion selection method. Through
measuring the electrode potential, the instrument obtains the ammonia-
nitrogen content in the water sample.
3 Measuring performance requirements
According the different use occasions of ammonia-nitrogen automatic
analyzers, the instrument is divided into Class A and Class B. Class A
instrument is used in occasion of low concentrations. Class B instrument is
used in occasion of high concentrations. For those occasions using both
classes, the instrument must meet all requirements of Class A and Class B.
Measuring instrument’s performance requirements are shown in Table 1.
5.3.4 Stability
In accordance with the instrument specifications and requirements, perform
preheating stability and calibration to the instrument. For Class A instrument,
use the ammonia-nitrogen standard solution with concentration of 2.0 mg/L to
measure. For Class B instrument, use the ammonia-nitrogen standard solution
with concentration of 25 mg/L to measure. Measure 1 time for each 0.5 h.
Continuously measure for 4 h. According to formula (6), calculate the relative
change amplitude of initial value for each measured value. Take the maximum
absolute value as the verification result of instrument stability.
Where.
M - instrument stability, %;
Ci – Instrument’s i-th measured value, mg/L;
c0 - initial measured value, mg/L.
5.3.5 Response time
The system is firstly cleaned with ammonia-free water. For Class A instrument,
use the ammonia-nitrogen standard solution with concentration of 2.0 mg/L to
measure. For Class B instrument, use the ammonia-nitrogen standard solution
with concentration of 25 mg/L to measure. When the test solution enters into
the instrument detection tank, it is as the starting point. Record the time when
the instrument’s indicated value reaches the 90% of stable indicated value.
Repeatedly measure for 3 times. Take the average value as the verification
result of response time.
5.3.6 Safety performance
5.3.6.1 Insulation resistance
Power plug is not connected to the grid. The power switch is at ON position.
Use insulation resistance meter to apply 500 V d.c. test voltage between the
power inlet-line and chassis. After it is stable for 5 s, measure the insulation
resistance.
5.3.6.2 Insulation strength
Power plug is not connected to the grid. The power switch is at ON position.
Use voltage-withstand tester to respectively apply test voltage between the
power inlet line and chassis. The test voltage is gradually increased to 1.5 kV,
current-limit of 5 mA. Maintain for 1 min. Observe if there is arcing and
C.2 Conclusion pages of verification certificate
Certificate Number xxxxxx - xxxx
Verification Result
Tested items and verification result.
Instrument category. Class A Class B
S/N Verification item Verification result
1 Appearance
2 Indicated value error /(% or mg/L)
3 Repeatability /%
4 Stability /%
5 Response time/min
6 Insulation resistance/MΩ
7 Insulation strength
8 Leakage Current/mA
(Blank)
C.3 Conclusion pages of verification certificate
Certificate Number xxxxxx - xxxx
Verification Result
Tested items and verification result.
Instrument category. Class A Class B
S/N Verification item Verification result
1 Appearance
2 Indicated value error /(% or mg/L)
3 Repeatability /%
4 Stability /%
5 Response time/min
6 Insulation resistance/MΩ
7 Insulation strength
8 Leakage Current/mA
Unqualified item of verification result.
(Blank)
......
JJG 631-2004
Ammonia Analyzers
National Metrology Verification Regulations of the People's Republic
Ammonia automatic monitor
Released on.2004-03-02
2004-09-02 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
Ammonia automatic monitor verification procedures
AmmoniaAnaly
Zers
Replace JJG 631-1989
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 02,.2004, and
Implemented on September 2,.2004.
Focal Point. National Environmental Chemometrics Technical Committee
Main drafting unit. Shanghai Institute of Metrology and Testing Technology
Participated in drafting unit. Shanghai Lei Magnetic Instrument Factory
This procedure entrusts the National Environmental Chemometrics Technical Committee to explain
The main drafters of this procedure.
Gong Feiyan (Shanghai Institute of Metrology and Testing Technology)
Participate in the drafters.
Xie Luyun (Shanghai Institute of Metrology and Testing Technology)
Wang Qiaomei (Shanghai Lei Magnetic Instrument Factory)
table of Contents
1 range (1)
2 Overview (1)
3 Metrological performance requirements (1)
3.1 Indication error limit (1)
3.2 Repeatability (1)
3.3 Stability (1)
3.4 Response time (1)
4 General technical requirements (1)
4.1 Appearance (1)
4.2 Safety requirements (1)
5 measuring instrument control (2)
5.1 Verification conditions (2)
5.2 Verification project (2)
5.3 Verification method (3)
5.4 Processing of verification results (4)
5.5 Verification cycle (4)
Appendix A Preparation of Ammonia Nitrogen Standard Solution (5)
Appendix B Ammonia Automatic Monitor Calibration Record (6)
Appendix C Verification Certificate (inside page) format (7)
Appendix D Verification Result Notice (inside page) format (8)
Ammonia automatic monitor verification procedures
1 Scope
This procedure is applicable to the first verification, subsequent verification and use of the ammonia automatic monitor (ammonia gas sensitive electrode method).
Test.
2 Overview
The ammonia automatic monitor (hereinafter referred to as the instrument) can automatically and continuously monitor the ammonia nitrogen in the water such as surface water and discharge water.
degree. Ammonia gas sensitive electrode is a composite electrode composed of a monopolar working electrode, a reference electrode and a gas permeable membrane, and the electromotive force generated by the same
It varies with the activity of ammonia in the solution, which is indicated by concentration.
The instrument can be represented by block diagram 1.
3 Metrological performance requirements
3.1 indication error limit. ±10%
3.2 Repeatability. the relative standard deviation is not more than 3%
3.3 Stability. ≤10% 4h
3.4 Response time. ≤6min
4 General technical requirements
4.1 Appearance
4.1.1 All fasteners of the instrument and accessories should be fastened; the connecting parts should be well connected; the moving parts should be moving.
Live and stable; all kinds of pipeline interfaces inside and outside the instrument must be reliably sealed to avoid leakage. The panel display is clear, complete, and micro
When the machine inputs an instruction, each corresponding function should be normal.
4.1.2 The instrument shall be marked with the name, model number, factory number, date of manufacture, name of the manufacturer, manufacturing measuring instrument
The mark and number can be certified with instructions. All plating surfaces of newly manufactured instruments should not have peeling phenomenon, painting table
The surface color should be uniform, and there should be no obvious scratches, exposed bottoms, cracks, blistering and rusting.
Neat, no rough unevenness. The instrument in use should not have any damage that would affect its normal operation.
4.2 Safety requirements
......
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