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JJG 986-2004 English PDF

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JJG 986-2004: Verification Regulation of Wood Moisture Content Measuring Meters
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 986-2004	English	369	Add to Cart	3 days [Need to translate]	Verification Regulation of Wood Moisture Content Measuring Meters	Valid	JJG 986-2004

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Basic data

Standard ID	JJG 986-2004 (JJG986-2004)
Description (Translated English)	Verification Regulation of Wood Moisture Content Measuring Meters
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A61
Classification of International Standard	17
Word Count Estimation	14,170
Date of Issue	2004-03-02
Date of Implementation	2004-06-02
Regulation (derived from)	Administration of Quality Supervision, Inspection and Quarantine No. 24 of 2004
Summary	This standard applies to the moisture content of wood and products of wood moisture measurement measuring instrument (hereinafter referred to as measuring instrument) of the initial verification, testing and use of follow-up inspection.

JJG 986-2004: Verification Regulation of Wood Moisture Content Measuring Meters

---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.
Verification Regulation of Wood Moisture Content Measuring Meters National Metrology Verification Regulations of the People's Republic Wood moisture meter Released on.2004-03-02 2004-06-02 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Wood moisture meter test procedures Meters This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 02,.2004, and Implemented on June 2,.2004. Focal Point. National Physical and Chemical Measurement Technical Committee Main drafting unit. Jiangsu Institute of Metrology and Testing Technology Participated in the drafting unit. Tianjin Institute of Metrology and Technology Shanghai Timber Industry Research Institute This procedure entrusts the National Physical and Chemical Metrology Technical Committee to explain The main drafters of this procedure. Cai Yeqiang (Jiangsu Institute of Metrology and Testing Technology) Participate in the drafters. He Xia (Tianjin Institute of Metrology and Technology) Li Xiaozhong (Tianjin Institute of Metrology and Technology) Li Jiping (Shanghai Timber Industry Research Institute) Ren Chengxia (Jiangsu Institute of Metrology and Testing Technology)

1 Scope (1) 2 Overview (1) 3 Metrological performance requirements (1) 3.1 Measuring instrument accuracy level (1) 3.2 Measuring instrument stability (1) 4 General technical requirements (2) 4.1 Appearance (2) 4.2 Safety requirements (2) 5 measuring instrument control (2) 5.1 Verification conditions (2) 5.2 Verification project (3) 5.3 Verification method (3) 5.4 Processing of verification results (4) 5.5 Verification cycle (4) Appendix A Wood Moisture Meter Verification Record (5) Appendix B Air relative humidity table above saturated salt solution and its production method (6) Appendix C Technical Requirements for Wood Samples (7) Appendix D Verification Certificate (Back) Format (8) Appendix E Verification Result Notice (Back) Format (9) Wood moisture meter test procedures

1 Scope

This procedure is applicable to wood moisture meter for measuring the moisture content of wood and its products (hereinafter referred to as measurement). The first test, subsequent verification and in-use test of the instrument.

2 Overview

The meter is mainly used to quickly detect the moisture content in wood, wood products and artificial boards. Measuring instrument according to the principle area Points, mainly resistance and capacitance methods. The electric resistance measuring instrument converts the moisture content in the wood through the probe and related circuits. It is replaced by an electrical signal, and then by the conversion of the electrical signal, the meter indicates the measured value. Capacitance measuring instrument is to contain wood The change of the dielectric constant of the capacitor caused by the change of water rate is converted into an electrical signal by the measuring circuit, and then converted, The meter displays the measured value.

3 Metrological performance requirements

3.1 gauge accuracy level The indication error is expressed in absolute error. The meter can be divided into three grades according to the indication error, as shown in Table 1. Table 1 Instrument indication tolerance Accuracy level indication maximum allowable error /% 1.0 level ± 1.0 2.0 level ± 2.0 5.0 level* ±5.0 The meter shall comply with the requirements of Table 1 within the range of 6% to 28% moisture content. The 5.0 level* measuring instrument refers to a measuring instrument that does not specify the type of material or the moisture content of the poplar wood, and any one of them is seeded. The indication error of the degree shall not exceed ±5.0%. The measuring instrument with the moisture content of poplar shall not exceed the indication error ±2.0%. 3.2 Measuring instrument stability Under the test of environmental conditions, when the power supply voltage changes by 10%, the error caused by the change of indication value, in the moisture content The range of 6%~28% should meet the requirements of Table 2. Table 2 Instrument Stability Requirements Accuracy level reading maximum change value /% 1.0 level ± 1.0 2.0 level ± 2.0 5.0 ± 2.0

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