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.

JJF 1001-1998
JJF 1015-2002
GB 1103-2007
GB/T 6102.2-2009

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 itemsbzxZ.net
Compression force/N
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
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