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JJF 1714-2018 English PDF

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JJF 1714-2018: Program of Pattern Evaluation of Low-level Dissolved Oxygen Meters
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1714-2018	English	559	Add to Cart	4 days [Need to translate]	Program of Pattern Evaluation of Low-level Dissolved Oxygen Meters	Valid	JJF 1714-2018

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Basic data

Standard ID	JJF 1714-2018 (JJF1714-2018)
Description (Translated English)	Program of Pattern Evaluation of Low-level Dissolved Oxygen Meters
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A61
Word Count Estimation	24,237
Date of Issue	2018-06-25
Date of Implementation	2018-09-25
Regulation (derived from)	State Administration of Markets, Announcement No. 13 of 2018
Issuing agency(ies)	State Administration for Market Regulation

JJF 1714-2018: Program of Pattern Evaluation of Low-level Dissolved Oxygen Meters

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Program of Pattern Evaluation of Low-level Dissolved Oxygen Meters National Metrology Technical Specification of the People's Republic Micro-dissolved oxygen analyzer type evaluation outline Published on.2018-06-25 2018-09-25 implementation State Administration of Markets issued Trace dissolved oxygen analyzer Type evaluation outline Focal Point. National Physical and Chemical Metrology Technical Committee Drafted by. China Institute of Metrology Guangxi Zhuang Autonomous Region Metrology and Inspection Institute Shaanxi Institute of Metrology This specification entrusts the National Physical and Chemical Measurement Technical Committee to explain The main drafters of this specification. Xiu Hongyu (China Institute of Metrology) Feng Kerong (Guangxi Zhuang Autonomous Region Metrology and Testing Institute) Sun Xirong (Shaanxi Institute of Metrology) Participate in the drafters. He Xinyang (China Institute of Metrology)

Introduction (II) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Legal management requirements (2) 4.1 Unit of measurement (2) 4.2 Accuracy level (2) 4.3 signs (2) 5 Measurement requirements (2) 6 General technical requirements (3) 6.1 Appearance (3) 6.2 Dissolved Oxygen Sensor (3) 6.3 Environmental Adaptability (3) 6.4 Stability (3) 7 type evaluation item list (4) 8 Technical documents and test samples to be submitted by the applicant (4) 8.1 Technical Information Submitted (4) 8.2 Provide the number of prototypes and how to use the prototype (4) 9 test methods and conditions of type evaluation items and data processing and qualification criteria (5) 9.1 Measurement performance test (5) 9.2 General technical requirements test (8) Judgment of 10 type evaluation results (10) 11 Measuring instruments and equipment used in the test items (10) Appendix A Trace Dissolved Oxygen Analyzer Type Evaluation Original Record Format (12) Appendix B Preparation method of anaerobic water (18) Appendix C Concentration of saturated dissolved oxygen in pure water (19)

Introduction

This type of evaluation outline is JJF 1015-2014 "General Specification for Type Evaluation of Measuring Instruments" and JJF 1016- 2014 “Guidelines for the Preparation of Types of Measuring Instruments for Evaluation of Instruments” are formulated for basic norms. The technical indicators and test methods of this type evaluation outline refer to JJG1060-2010 "Determination of trace dissolved oxygen" Instrument, GB/T 20245.4-2013 "Electrochemical analyzer performance representative part 4. using laminated current sensing The instrument measures the dissolved oxygen in water and other documents. This type of evaluation outline is the first release. Micro-dissolved oxygen analyzer type evaluation outline

1 Scope

This type evaluation outline is applicable to the range of the membrane electrode dissolved oxygen meter with the classification code of 46360500. Type evaluation of a (0 to 100) μg·L-1 micro-dissolved oxygen meter.

2 reference files

This specification refers to the following documents. JJG1060-2010 Trace Dissolved Oxygen Analyzer GB/T 20245.4-2013 Electrochemical analyzer performance - Part 4. s. Measuring dissolved oxygen in water For dated references, only dated versions apply to this specification; undated quotations The latest version (including all amendments) applies to this specification.

3 Overview

The micro-dissolved oxygen analyzer is applied to the dissolved oxygen content of process water in the power, electronics, energy, chemical and other industries. The test is usually composed of a dissolved oxygen sensor (or dissolved oxygen probe) and an electronic unit (or secondary instrument). Measurement The principle of quantity is mainly divided into polarographic method and fluorescence method, and polarographic method is the most extensive. Polarographic micro-dissolved oxygen analyzer (simplified below) The instrument is used to measure dissolved oxygen in water in the range of (0~100) μg·L-1 by electrochemical polarography sensor. The schematic for the instrument. The working principle is as follows. the cathode of the polarographic sensor is usually gold or platinum, and the anode is mostly silver. (Alternatively, other metals such as lead), selective oxygen permeable membranes can only pass through gases such as oxygen. When the water sample flows through the dissolved oxygen sensor When the oxygen in the water sample diffuses into the membrane through the selective oxygen permeable membrane, the rate of diffusion depends on the oxygen molecules passing through the oxygen permeable membrane. Concentration and temperature gradients. The dissolved oxygen molecules in the water are reduced at the cathode by the polarization voltage, and the dissolved oxygen sensor is generated. Responsive current. At a certain temperature, the magnitude of the response current is proportional to the dissolved oxygen content. Response current Road, showing the dissolved oxygen content in the water. At the cathode, oxygen is reduced to hydroxide. O2 2H2O 4e → 4OH- On the anode, the metal anode is oxidized to a metal ion. Me nCl- →MeCln ne The key component of the instrument is a dissolved oxygen sensor.

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