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JJF 1689-2018 English PDF

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JJF 1689-2018: Calibration Specification for Water Colorimeters
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1689-2018	English	419	Add to Cart	4 days [Need to translate]	Calibration Specification for Water Colorimeters	Valid	JJF 1689-2018

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Basic data

Standard ID	JJF 1689-2018 (JJF1689-2018)
Description (Translated English)	Calibration Specification for Water Colorimeters
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A60
Word Count Estimation	18,136
Date of Issue	2018-02-27
Date of Implementation	2018-05-27
Regulation (derived from)	AQSIQ Announcement No. 26 of 2018
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine

JJF 1689-2018: Calibration Specification for Water Colorimeters

---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 Water Colorimeters National Metrology Technical Specification of the People's Republic Water colorimeter calibration specification Published on.2018-02-27 2018-05-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Water colorimeter calibration specification Focal Point. National Optical Metrology Technical Committee Main drafting unit. Hebei Institute of Metrology Henan Institute of Metrology Participated in the drafting unit. Shanghai Haorui Instrument Co., Ltd. Hebei Metrology Supervision and Inspection Institute This specification entrusts the National Optical Metrology Technical Committee to explain The main drafters of this specification. Cai Zonglin (Hebei Institute of Metrology) Sun Xiaoping (Henan Institute of Metrology) Sun Wei (Hebei Institute of Metrology) Participate in the drafters. Zhu Hanfei (Shanghai Haorui Instrument Co., Ltd.) Wang Yonghao (Hebei Institute of Metrology) Bi Lixin (Hebei Province Metrology Supervision and Inspection Institute) Li Wei (Henan Institute of Metrology)

Introduction (II) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 Terminology (1) 3.2 Unit of measurement (1) 4 Overview (1) 5 Measurement characteristics (2) 5.1 Zero-point drift of digital display instrument (2) 5.2 indication error (2) 5.3 Repeatability of digital display (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Inspection and preparation before calibration (3) 7.2 Zero drift of digital display instrument (3) 7.3 indication error (3) 7.4 Repeatability of digital display instruments (3) 8 calibration result expression (4) 9 re-study interval (4) Appendix A Calibration Original Record Recommended Format (5) Appendix B Recommended Format for Calibration Certificate (6) Appendix C Example of Uncertainty Evaluation of Measurement Results (7) Appendix D Series Standard Solution Preparation (10) Appendix E Spectrophotometric Method for Measuring Color Plate Colors of Visual Instruments (11)

Introduction

This specification is based on JJF 1001-2011 "General Terms and Definitions of Measurement", JJF 1059.1-2012 Deterministic Evaluation and Representation, JJF 1094-2002 "Measuring Instrument Characteristics Evaluation" and JJF 1071-2010 "Country Compilation of the rules for the preparation of metrological calibration specifications. According to the actual situation of the water color meter, this specification is formulated according to ISO 7887.2011 Method D in Water Quality-Examination and Determination of Color. Natural Visual method of water color measurement. This specification is the first release. Water colorimeter calibration specification

1 Scope

This specification applies to the calibration of water colorimeters using platinum-cobalt units.

2 reference files

GB/T 6682-2008 Analytical laboratory water specifications and test methods GB/T 11903 Determination of water color chromaticity ISO 7887.2011 Water quality color detection (Waterquality-Examinationanddetermina- Tionofcolor) For dated references, only dated versions apply to this specification; undated quotations The latest version (including all amendments) applies to this specification.

3 terms and units of measure

3.1 Terminology 3.1.1 Platinum cobalt unit Pt-Counit, PCU a solution containing platinum (in the form of chloroplatinum (IV) acid salt) and cobalt (II) chloride hexahydrate at a specified concentration Color unit. Contains 1 mg of platinum per [liter of chloroplatinum (IV) acid salt] and 2 mg of cobalt chloride hexahydrate The platinum cobalt solution of (II) has a color of 1 degree. 3.2 Unit of measurement The common unit of water color chromaticity is degree. Other units include milligrams of platinum per liter, platinum-cobalt, platinum-cobalt units, and black. The unit symbols are mgPtL-1, Pt-Co, PCU, and Hazen, and the conversion relationship is as follows. 1 degree=1mgPtL-1=1Pt-Co=1PCU=1Hazen

4 Overview

Water colorimeter is a measuring instrument for measuring the color of water according to the platinum-cobalt colorimetric method specified in GB/T 11903. Color test for clean water, lightly polluted and slightly yellowed water, cleaner ground water, ground water and drinking water Measurement. According to its working principle and method, water quality colorimeter (hereinafter referred to as instrument) can be divided into visual instruments and digital display instruments. The light source of the visual instrument is transmitted or reflected, and passes through the liquid column from the bottom of the colorimetric tube. The color of the field of view, the value represented by the color palette that best matches the water sample being tested, is the chromaticity value of the water sample. Visual instrument such as As shown in Figure 1, it is generally composed of a light source, a light source correction system, a color palette, a sample slot, an observation eyepiece, etc., usually Equipped with a colorimetric tube. Digital display instrument according to Lambert-Beer law, when a bundle of parallel monochromatic light passes through a water sample containing a light absorbing substance, the light Part of the absorption is absorbed, and when the thickness of the absorption layer is constant, the absorbance is proportional to the concentration of the light absorbing substance, and the photodetector is passed through The optical signal is converted into an electrical signal, and the chromaticity of the water sample is displayed after the microprocessor. The digital display instrument is shown in Figure 2, usually by Light source, spectroscopic system, sample cell, photodetector, display device, etc.

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