This procedure applies to the initial verification, subsequent verification and in-use inspection of resistance-type raw cotton moisture meter. The requirements for metrological characteristics of type evaluation can refer to this procedure. JJG 845-2009 Raw Cotton Moisture Meter JJG845-2009 Standard download decompression password: www.bzxz.net
This procedure applies to the initial verification, subsequent verification and in-use inspection of resistance-type raw cotton moisture meter. The requirements for metrological characteristics of type evaluation can refer to this procedure.
National Metrology Verification Regulation of the People's Republic of China JJG 845—2009 Raw Cotton Moisture Tester Issued on August 24, 2009 Implementation on September 1, 2009 Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJG 845--2009 Verification Regulation of Raw Cotton Moisture Tester JJG845—2009 Replaces JJG845- This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on August 24, 2009 and came into effect on September 1, 2009. Responsible unit: National Technical Committee for Physical and Chemical Metrology Drafting unit: National Fiber Metrology Station Hubei Institute of Metrology and Testing Technology Shaanxi Huasite Instrument Co., Ltd. This regulation is entrusted to the National Technical Committee for Physical and Chemical Metrology to be responsible for the interpretation of this regulation. Main drafters: JJG845-200S Zhang Baoguo (National Fiber Metrology Station) Yang Chunlin (Hubei Institute of Metrology and Testing Technology) Han Gang (Shaanxi Huasite Instrument Co., Ltd.) Overall drafter: Tang Wei (National Fiber Metrology Station) Zhang Mingzhu (Shaanxi Huasite Instrument Co., Ltd.) 2 References 3Overview 4Metering performance requirements Compression force DC working voltage Moisture regain indication error Temperature indication error 5General technical requirements Each component 6Metering instrument control Verification conditions Verification items and verification methods Processing of verification results 6.4Verification cycle Appendix A Calibration resistance of raw cotton moisture meter Appendix B Appendix C Appendix D JJG 845—2009 Verification record sheet for raw cotton moisture meter Inner page format of verification certificate Inner page format of verification result notice· (1) (1)) (1) (2) (3) 1Scope JJG 845—2009 Verification procedure for raw cotton moisture meter This procedure applies to the initial verification, subsequent verification and in-service inspection of resistance-type raw cotton moisture meter. The requirements for metrological characteristics of type evaluation can refer to this procedure. 2 References This specification references the following documents JJF1001---1998 (General metrological terms and definitions) JJF1015-2002 General specification for type evaluation and type approval of measuring instruments GB1103-2007 Cotton fine linter GB/T6102.2-2009 Test method for moisture regain of raw cotton - electric measuring instrument method When using this specification, attention should be paid to using the current valid versions of the above referenced documents . 3 Overview Cotton moisture refers to the water molecules contained in cotton fibers. The amount of water in cotton is usually expressed by moisture content or regain. Moisture content refers to the percentage of the mass of water contained in the fiber to the mass of wet fiber, and regain refers to the percentage of the mass of water contained in the fiber to the mass of dry fiber. GB1103-2007 "Cotton Fine Staple Cotton" and GB/T6102.2---2009 "Test Method for Moisture Regain of Raw Cotton - Electric Detector Method" both use regain to express cotton moisture. The raw cotton moisture meter (hereinafter referred to as the meter) is an instrument that uses the law of negative correlation between the resistance value of cotton fiber and its regain to measure the mass specific resistance of cotton fiber and indirectly measure the regain of cotton fiber under certain conditions of fiber quantity, pressure, voltage, temperature and test area. 4. Measuring performance requirements 4.1 Compression force (735±30)N. 4.2 DC working voltage ( 90±1)V. 4.3 Moisture regain indication error Moisture regain 3.0%~6.0%: ±0.2%; Moisture regain 6.1%~11.0%: ±0.1% Moisture regain 11.1%~~13.0%: ±0.2%. 4.4 Temperature indication error Within the working range of the measuring instrument, it shall not exceed ±1℃. 5 General technical requirements 5.1 Appearance JIG 845—2009 That is Shengran Bibaokang Water Flavor Company 5.1.1 The measuring instrument shall have a nameplate, which shall indicate the instrument's name, model, manufacturer, product number, date of manufacture and manufacturing permit mark of the measuring instrument. 5.1.2 The measuring instrument shall have no damage on the appearance, no rust on the electrode surface, and no loosening or falling off of all fasteners. 5.2 Components 5.2.1 The indicating or display part of the measuring instrument shall be clear and intact. 5.2.2 The operating parts of the measuring instrument shall be positioned to ensure normal measurement. 6 Measuring Instrument Control| |tt||The metrological control of the raw cotton moisture meter includes the initial calibration, subsequent calibration and in-use inspection. 6.1 Calibration conditions 6.1.1 Calibration environmental conditions Temperature: (15 Relative humidity: When the moisture regain is , the relative humidity is 65% When the moisture regain is , the relative humidity is -85 Before the calibration, Measuring standards and measuring instruments should be balanced for not less than "h under the environmental conditions of temperature and humidity. 6.1.2. Measuring standard instruments and main supporting equipment The standard equipment for calibrating the raw cotton moisture meter is the comprehensive calibrator, which is a special cotton moisture meter calibration instrument, including DC voltmeter, standard resistance box, special force measuring standard, standard thermometer and other instruments. Its various functional indicators should meet the requirements of 6.1.21 to 6.121 respectively. Each measuring standard should be qualified after verification 6.1.2.1 DC voltmeter The range is (0500)7 5.5 level. 6. ]2. 2 Special standard resistance box Resistor 0.1k21Mo: Maximum error ±o.5%Resistor L1M~100Mo: Maximum charge VEROLO Resistor 100M210G2: Maximum allowable error ±5%: Resistor 10GQ~~1TQ: Maximum allowable error ±8%. 6.1.2.3 Special force standard instrument The measuring range is 1000N, and the maximum permissible error is 0.5%FS.6.1.2.4 Standard thermometer The measuring range is (0-~50)℃, the graduation value is 0.1℃, and the maximum permissible error is 0.3℃6.2 Verification items and verification methods 6.2.1 Appearance and component inspection JG845—2009 The appearance and component inspection shall be carried out in accordance with the requirements of Chapter 5. 6.2.2 Compression force verification Place the force sensor at the center between the two plates. When the compression force of the measuring instrument reaches the set value of 735N, read the value of the comprehensive calibrator (force standard instrument) and repeat the measurement 3 times: the average value of the compression force shall comply with Article 4.1. 6.2.3 DC working voltage verification Connect the positive pole of the DC voltmeter to the output terminal of the measuring instrument, and the negative pole to the ground, so that the verification switch is in the voltage verification and working state, and measure the voltage alternately for 3 times. The average value of the readings should comply with Article 4.2. 6.2.4 Moisture regain indication error verification NOHDNIHSTH Insert the two connecting lines of the comprehensive calibration instrument (special standard resistance box) into the external measurement socket of the instrument, turn on the power supply: when the measuring instrument is in the low gear or high gear calibration state, turn the knob of the special standard resistance box of the comprehensive calibration instrument to 3% to 13% respectively. The indication error of the moisture regain of the measuring instrument should comply with Article 4.3 AR- Where: AR Resilience indication error Purchase instrument indication: W standard international standard indication. 6.2.5 Verification of temperature error Measure once Measure the room temperature in the air quality chamber and observe the indications of the comprehensive tester (thermometer) and the measuring instrument. The error should meet the requirements of Article 4.4. AT-measurement instrument temperature indication-standard instrument temperature indication Wuzhong: A7 Temperature indication error (measure twice and take the average) 6.3 Processing of verification results 6.3.1. The instrument that passes the calibration will be issued with a calibration certificate. The calibration certificate should give all the calibration results. 6.3.2 For instruments that fail the calibration, a calibration result notice shall be issued, and the unqualified items shall be indicated. 6.4 Calibration cycle The calibration cycle is year METROL Appendix A Moisture regain/% JJG 845—2009 Calibration resistance of raw cotton moisture meter Calibration resistance/n Moisture regain/% Calibration resistance/α Appendix B Manufacturing unit Inspected unit -Calibration items Compression force/N DC working voltage/V Moisture regain indication/% Temperature measurement/℃ JJG 8452009 Calibration record of raw cotton moisture meter Specification model Certification number Indicators and errors Intact 735±30 Moisture regain is ≤6.0%, Moisture regain is 6.1%~ 11.0%, ±0.1% Moisture regain is 11.1%~ 13.0%, ±0.2% Standard thermometer indication Measurement instrument indication Product number Calibration date Calibrator Relative humidity (RH) Calibration results Appendix C Name of measurement standard: Temperature: Calibration items Compression force/Nwww.bzxz.net DC working voltage/V Moisture regain indication error/% Temperature indication error/℃ JJG 845—2009 Verification certificate inner page format Manufacturer: Validity period of standard: Relative humidity: Page of total pages Verification results Verification results Appendix D Name of measurement standard: .Temperature: Verification items Compression force/N DC working voltage/V JJG 845—2009 Inner page format of verification result notice Manufacturer: Validity period of standard: Relative density: %Page total Verification result Verification result Indication error of moisture regain/% Indication error of temperature/% Unqualified items Tip: This standard content only shows part of the intercepted content of the complete standard. 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