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JJG 891-2019 English PDF

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JJG 891-2019: Capacitive and Resistive Grain Moisture Testers
Status: Valid

JJG 891: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 891-2019	English	439	Add to Cart	3 days [Need to translate]	Capacitive and Resistive Grain Moisture Testers	Valid	JJG 891-2019
JJG 891-1995	English	319	Add to Cart	3 days [Need to translate]	Verification regulation of instruments for measuring the moisture content of grain with capacitance and resistance method	Obsolete	JJG 891-1995

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Basic data

Standard ID	JJG 891-2019 (JJG891-2019)
Description (Translated English)	Capacitive and Resistive Grain Moisture Testers
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A61
Classification of International Standard	17.020
Word Count Estimation	19,165
Date of Issue	2019
Date of Implementation	2020-03-27
Issuing agency(ies)	State Administration for Market Regulation

JJG 891-2019: Capacitive and Resistive Grain Moisture Testers

---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.
Capacitive and Resistive Grain Moisture Testers National Measurement Verification Regulations of the People's Republic of China Capacitance and resistance method grain moisture analyzer Published on December 31,:2019 2020-03-31 Implementation Issued by the State Administration of Market Supervision and Administration Capacitance and resistance methods for grain moisture Tester Verification Regulations MoistureTesters Replace JJG 891-1995 Centralized unit: National Physical and Chemical Measurement Technical Committee Main drafting unit: Shanghai Institute of Metrology and Testing Technology Hebei Institute of Metrology Supervision and Inspection Chinese Academy of Metrology Participated in the drafting unit: Shanghai Qingpu Oasis Testing Instrument Co:, Ltd: This regulation is entrusted to the National Physical and Chemical Measurement Technical Committee for interpretation The main drafters of this regulation: Cui Tiyun (Shanghai Institute of Measurement and Testing Technology) Fang Jing (Hebei Institute of Metrology, Inspection and Testing) Wang Long (Hebei Metrology Supervision and Testing Institute) Yang Ju (Chinese Academy of Metrology) Participating drafters: Li Xuanye (Hebei Institute of Metrology Supervision and Inspection) Zhang Wendong (Shanghai Institute of Metrology and Testing Technology) Xue Xiaohua (Shanghai Qingpu Oasis Testing Instrument Co:, Ltd:)

Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Measurement performance requirements (1) 5 General technical requirements (2) 5:1 Inspection of signs and logos of legal measurement management (2) 5:2 Appearance and function inspection (2) 6 Control of measuring instruments (2) 6:1 Verification conditions (2) 6:2 Verification items (2) 6:3 Verification method (3) 6:4 Processing of verification results (3) 6:5 Verification period (3) Appendix A Full range of moisture measurement and main moisture measurement range (4) Appendix B: Preparation of cereal samples (5) Appendix C Determination of moisture content of cereal samples (7) Appendix D Verification Record Format (10) Appendix E Format of the inner page of the certificate of verification/certification result (13)

Introduction

This regulation is based on the national standard GB/T 19878-2005 "Capacitance Method and Resistance Method for Grain Moisture Analyzer "Technical Conditions", International Recommendations of the International Organization for Legal Metrology (OIML) R59-1::2016 (E) "Cereals and Oils Seed moisture meter Part 1: Measurement and technical requirements (Moisturemetersforcerealgrainsandoil- seeds-Part 1: Metrological and technical requirements) '' as the technical basis The current status of the moisture meter industry is revised for JJG 891-1995: Full range of moisture measurement and main moisture measurement The main indicators such as range and moisture meter measurement performance requirements are close to GB/T 19878-2005: The content of the measurement performance requirements of the moisture meter was revised, and the content of the maximum allowable error requirements of ISO 7700-1 was modified: Compared with the JJG 891-1995 version, the main technical changes except for editorial changes are as follows: --- Added the introduction content; --- Delete instruments with 0:2 accuracy level; --- Delete the instrument's safety performance requirements, moisture measurement time requirements and verification of insulation resistance, insulation strength, etc: project; --- "General inspection of appearance" was changed to "General technical requirements", and related content was added (see 5); --- Indicated error and repeatability verification stipulates the verification point, the verification point measurement frequency is changed from 3 4 times (see 6:3:2); --- Modify the appendix of "Measuring Variety of Water Content Range" appendix to "full range of moisture measurement and main moisture measurement range "Wai", the corn water measurement range was changed from (10 ~ 22)% to (9 ~ 33)% (see Appendix A); --- Added "Methods for preparing grain samples" (see Appendix B); --- Added "Determination of moisture content of grain samples" (see Appendix C); --- Respectively, according to the new regulations, the original record format, verification certificate format/test result notification format The content was modified accordingly (see Appendix D and Appendix E): The previous releases of this regulation are: --- JJG 891-1995: Verification Regulation of Capacitance and Resistance Method Grain Moisture Analyzer

1 Scope

This regulation is applicable to the first verification and follow-up of the capacitance method and resistance method grain moisture analyzer for analysis after sampling Verification and inspection in use:

2 Reference documents

This regulation refers to the following documents: JJF1380-2012 Outline of Type Evaluation of Capacitance and Resistance Method Grain Moisture Analyzer GB/T 19878-2005 General technical conditions for capacitance and resistance method grain moisture analyzer 0IMLR59-1::2016 (E) Grain and Oil Seed Moisture Meter Part 1: Metering and Technical Requirements (Moisturemetersforcerealgrainsandoilseeds-Part 1: Metrologicalandtechnicalre- quirements) ISO 7700-1 Performance verification of hygrometers in use for food: Part 1: Hygrometers for cereal (FoodProducts-Checkingtheperformanceof moistureinuse-Part 1: Moisture metersforcereals) For dated references, only the dated versions are applicable to this Regulation; for those without dates The latest version (including all amendments) is applicable to this regulation:

3 Overview

Capacitance method and resistance method grain moisture analyzer (hereinafter referred to as moisture meter) is to use grain moisture The corresponding relationship between characteristics or resistivity is designed and manufactured: The capacitance method moisture meter is composed of a sensor, a secondary instrument and a blanking barrel; the resistance method moisture meter is composed of a sensor and a secondary instrument Table composition:

4 Measurement performance requirements

The indication error and repeatability of the moisture meter should meet the requirements of Table 1: Table 1 Moisture meter measurement performance requirements level of accuracy Main moisture measurement range Full range of moisture measurement Other measuring ranges Maximum allowable error Repeatability Maximum allowable error Repeatability 0:5 level ± 0:5 ≤0:2 ± 1:0 ≤0:5 Level 1 ± 1:0 ≤0:5 ± 2:0 ≤1:0 Note: "Main moisture measurement range" and "other measurement ranges of the full range of moisture measurement" are detailed in Appendix A:

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