JJG 631-2004

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Related Standard	Status	PDF
JJG 631-2004	English	459	Add to Cart	4 days	Ammonia Analyzers	JJG 631-2004	Obsolete	JJG 631-2004

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