JJG 21: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 21-2010 | English | RFQ |
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3 days [Need to translate]
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Tobacco. Verification Regulation of Atmosphere Condition for Laboratory
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JJG 21-2010
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| JJG 21-2008 | English | 579 |
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5 days [Need to translate]
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Verification Regulation of Micrometer
| Valid |
JJG 21-2008
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| JJG 21-1995 | English | 439 |
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4 days [Need to translate]
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Verification Regulation of Micrometer
| Obsolete |
JJG 21-1995
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| JJG 21-1986 | English | RFQ |
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3 days [Need to translate]
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velification Regulation of Micrometer with Measuring Range up to 500 mm
| Obsolete |
JJG 21-1986
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Standard similar to JJG 21-2010 JJG 42 JJG 21 JJF 021 Basic data | Standard ID | JJG 21-2010 (JJG21-2010) | | Description (Translated English) | Tobacco. Verification Regulation of Atmosphere Condition for Laboratory | | Sector / Industry | Metrology & Measurement Industry Standard | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | JJG 21-2010: Tobacco. Verification Regulation of Atmosphere Condition for Laboratory---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.
Tobacco.Verification Regulation of Atmosphere Condition for Laboratory
Ministry of People's Republic of China Metrology Verification Regulations
JJG (Tobacco) 21-2010
Tobacco laboratory atmospheric environment verification procedures
Released on.2010-08-02
2010-08-15 implementation
National Tobacco Monopoly Bureau released
Tobacco laboratory atmospheric environment verification procedures
JJG (Tobacco) 21-2010
Replace JJG (Tobacco) 21-2003
This regulation was approved by the State Tobacco Monopoly Bureau on August 2,.2010, and since August 15,.2010
Implemented from day to day.
Focal Point. Science and Technology Department of the State Tobacco Monopoly Bureau
Main drafting unit. China Tobacco Standardization Research Center
Participated in the drafting unit. National Meteorological Station
Jiangsu Zhongyan Industry Co., Ltd. Xuzhou Cigarette Factory
This regulation is interpreted by the National Tobacco Standardization Technical Committee.
JJG (Tobacco) 21-2010
The main drafters of this procedure.
Nursery (China Tobacco Standardization Research Center)
Zhang Wei (China Tobacco Standardization Research Center)
Participate in the drafters.
Yang Rongchao (China Tobacco Standardization Research Center)
Zhao Hang (China Tobacco Standardization Research Center)
Fan Li (China Tobacco Standardization Research Center)
Li Dong (China Tobacco Standardization Research Center)
Xuan Xiaoquan (Xuzhou Cigarette Factory of Jiangsu China Tobacco Industry Co., Ltd.)
Du Muzhu (Jiangsu China Tobacco Industry Co., Ltd. Xuzhou Cigarette Factory)
Wang Xiaochun (Xuzhou Cigarette Factory of Jiangsu China Tobacco Industry Co., Ltd.)
Zhu Lekun (National Meteorological Station)
Wen Xiaoqing (National Meteorological Station)
JJG (Tobacco) 21-2010
table of Contents
1 Scope (1)
2 Citations (1)
3 terms (1)
4 Overview (1)
5 Metrological performance requirements (1)
6 General technical requirements (2)
6.1 Laboratory Building Conditions (2)
6.2 Laboratory constant temperature and humidity system (2)
7 Measuring instrument control (3)
7.1 Verification conditions (3)
7.2 Verification project (3)
7.3 Verification method (3)
7.4 Processing of verification results (5)
7.5 Verification cycle (5)
Appendix A Tobacco Laboratory Atmospheric Environment Calibration Record Format (6)
JJG (Tobacco) 21-2010
Tobacco laboratory atmospheric environment verification procedures
1 Scope
This procedure is applicable to the first-time verification of the atmospheric environment of tobacco constant temperature and humidity laboratory after new construction, in use and overhaul of the system.
Subsequent verification and in-use inspection.
2 Citations
This procedure refers to the following documents.
GB/T 10739-2002 Standard atmospheric conditions for the treatment and testing of paper, board and pulp samples
GB/T 16447-2004 Atmospheric environment for the regulation and testing of tobacco and tobacco products
Use of this procedure should take care to use the current valid version of the above cited documents.
3 terms
This procedure specifies the following terms and applies only to this procedure.
3.1 Temperature fluctuation
Continuously measure 24h temperature at a certain verification point in the work area, record one data every 2 minutes, within any 24h
The extreme difference of the three 10min mean values of the 30min period represents the short-term fluctuation of temperature; continuous within 24h
The extreme difference of the 48 30 min period mean represents the long-term fluctuation of temperature.
3.2 Temperature uniformity
The temperature difference between the test points in the working area in any of the same 10min cycles indicates the temperature
Uniformity.
3.3 Relative humidity fluctuation
Continuously measure 24h relative humidity at a certain verification point in the work area, record one data every 2min, within 24h
The extreme difference of the three 10min mean values of a 30min period represents the short-term fluctuation of relative humidity; continuous within 24h
The extreme difference of the 48 30 min period mean represents the long-term fluctuation of relative humidity.
3.4 Relative humidity uniformity
The range of relative humidity averages in all the verification points in the working area in the same 10min period
For humidity uniformity.
4 Overview
The calibration of the atmospheric environment of the tobacco laboratory is based on the basic conditions of temperature and humidity of the tobacco laboratory using special measuring instruments.
Measurement and calculation of temperature and humidity fluctuations and uniformity, fresh air replenishment, air flow and noise
Calculate and judge whether the requirements are met according to the results.
JJG (Tobacco) 21-2010
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