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JJF 2087-2023 English PDF

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JJF 2087-2023: Calibration Specification for Photoelectric Suspended Sediment Concentration Sensors
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 2087-2023	English	369	Add to Cart	4 days [Need to translate]	Calibration Specification for Photoelectric Suspended Sediment Concentration Sensors	Valid	JJF 2087-2023

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Basic data

Standard ID	JJF 2087-2023 (JJF2087-2023)
Description (Translated English)	Calibration Specification for Photoelectric Suspended Sediment Concentration Sensors
Sector / Industry	Metrology & Measurement Industry Standard
Word Count Estimation	18,129
Date of Issue	2023-10-12
Date of Implementation	2024-04-12
Issuing agency(ies)	State Administration for Market Regulation

JJF 2087-2023: Calibration Specification for Photoelectric Suspended Sediment Concentration Sensors

---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.
National Metrology Technical Specifications of the People's Republic of China Calibration specifications for photoelectric sand content measuring instrument Released on 2023-10-12 Implemented on 2024-04-12 Released by the State Administration for Market Regulation Calibration specifications for photoelectric sand content measuring instrument Responsible unit: National Technical Committee on Measurement of Special Measuring Instruments for Water Transport Main drafting unit: Tianjin Water Transport Engineering Research Institute of the Ministry of Transport Participating in the drafting unit: Tianjin University Zhejiang Water Conservancy and Estuary Research Institute (Zhejiang Ocean Planning and Design Institute) Yangtze River Water Conservancy Commission Yangtze River Academy of Sciences This specification is entrusted to the National Water Transport Special Measuring Instruments Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification: Zhang Huaqing (Tianjin Water Transport Engineering Research Institute, Ministry of Transport) Cao Yufen (Tianjin Water Transport Engineering Research Institute, Ministry of Transport) Gao Shuxian (Tianjin Water Transport Engineering Research Institute, Ministry of Transport) Participating drafters: Bai Yuchuan(Tianjin University) Duan Wenyi [Zhejiang Provincial Water Conservancy and Estuary Research Institute (Zhejiang Provincial Marine Planning and Design Research Institute)] Li Yibo (Tianjin University) Wu Huali (Yangtze River Water Conservancy Commission, Yangtze River Academy of Sciences)

Introduction(Ⅱ) 1 Scope(1) 2 Cited documents(1) 3 Terminology and units of measurement(1) 4 Overview(1) 5 Measuring characteristics(2) 5:1 Zero point drift(2) 5:2 Calibration curve(2) 6 Calibration conditions(2) 6:1 Calibration environmental conditions(2) 6:2 Measuring standards and supporting equipment for calibration (2) 7 Calibration items and calibration methods (3) 7:1 Preparation before calibration(3) 7:2 Zero point drift(3) 7:3 Calibration curve(3) 8 Calibration result expression (4) 9 Recalibration time interval(5) Appendix A Sand content standard field preparation and uniformity test method (6) Appendix B Recommended format for original calibration records (8) Appendix C Recommended format for inner pages of calibration certificate (10) Appendix D Example of uncertainty assessment of calibration values of sand content measuring instrument (11)

Introduction

JJF 1001 "General Measurement Terms and Definitions", JJF 1059:1-2012 "Evaluation and Expression of Measurement Uncertainty" Together with JJF 1071-2010 "Rules for Writing National Measurement Calibration Specifications", they form the basis for supporting the formulation of this specification: Sexual serial norms: This specification adopts the dynamic calibration field method and refers to ISO 11657:2014 "Hydrological measurement of suspended matter in rivers": Hydrometry-Suspendedsediment Measurement of Suspended Sediment Concentration Using Alternative Technologies This specification is released for the first time: Calibration specifications for photoelectric sand content measuring instrument

1 Scope

This specification is applicable to the calibration of photoelectric sand content measuring instruments with a measurement range of (0:01~30)kg/m3:

2 cited documents

This specification references the following documents: ISO 11657:2014 Hydrological measurement of suspended sediment in rivers using alternative techniques to control suspended sediment concentration For dated references, only the dated version applies to this specification; for undated references, only the dated edition applies: The latest version (including all modification orders) shall apply to this specification:

3 Terminology and units of measurement

3:1 Terminology The mass of dry sediment entrained in a unit volume of water sample: Through power stirring, the pure water and sediment sample in the container are evenly mixed, and the device can prepare the standard value of sand content: 3:2 Unit of measurement The common unit of sand content is kilogram per cubic meter (kg/m3): Other units include grams per cubic centimeter and grams per cubic meter: Liter, grams per milliliter, milligrams per liter, the unit symbols are g/cm3, g/L, g/mL, mg/L respectively, and their conversion relationships as follows: 1kg/m3=10-3g/cm3=1g/L=10-3g/mL=1000mg/L

4 Overview

Photoelectric sand content measuring instrument (hereinafter referred to as sand content measuring instrument) is used in rivers, oceans, lakes, reservoirs, etc: Instrument for monitoring sediment content in water bodies: Sand content measuring instruments are divided into two types: self-containing type and direct reading type: The self-containing type is mainly It consists of photoelectric sensor, electronic components, data storage and power supply: The structural diagram is shown in Figure 1; the direct-reading type mainly consists of It consists of photoelectric sensors, electronic components, cables, etc: The structural diagram is shown in Figure 2:

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