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JJF 1833-2020: Calibration Specification for Vacuum Helium Leaks
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Calibration Specification for Vacuum Helium Leaks
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JJF 1833-2020
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Basic data | Standard ID | JJF 1833-2020 (JJF1833-2020) | | Description (Translated English) | Calibration Specification for Vacuum Helium Leaks | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A53 | | Classification of International Standard | 17.100 | | Word Count Estimation | 21,265 | | Date of Issue | 2020 | | Date of Implementation | 2020-04-17 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1833-2020: Calibration Specification for Vacuum Helium Leaks---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.
(Calibration Specification for Vacuum Helium Leakage)
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for vacuum helium leak
2020-01-17 released
2020-04-17 implementation
Issued by the State Administration for Market Regulation
Calibration specification for vacuum helium leak
Replace JJG793-1992
Focal point. National Pressure Measurement Technical Committee
Main drafting unit. China Institute of Metrology
Participated in the drafting. National Defense Science and Technology Industry Vacuum First-Class Measuring Station
Zhejiang Institute of Metrology
Shanghai Dongbei Vacuum Equipment Co., Ltd.
This specification entrusts the National Pressure Measurement Technical Committee to be responsible for interpretation
The main drafters of this specification.
Yu Hongyan (Chinese Academy of Metrology)
Wang Jinku (China Institute of Metrology)
Participating drafters.
Li Detian (Vacuum Level One Metering Station for National Defense Technology Industry)
Feng Yan (Vacuum Level One Metering Station for National Defense Technology Industry)
Chen Yuhang (Zhejiang Institute of Metrology)
Wang Jinsuo (Shanghai Dongbei Vacuum Equipment Co., Ltd.)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Terms and measurement units (1)
3.1 Term (1)
3.2 Unit of measurement (2)
4 Overview (2)
5 Measurement characteristics (2)
6 Calibration conditions (2)
6.1 Environmental conditions (2)
6.2 Measurement standards and other equipment (3)
7 Calibration items and calibration methods (3)
7.1 Calibration items (3)
7.2 Calibration method (3)
8 Calibration result expression (8)
9 Re-calibration interval (8)
Appendix A. Vacuum Leak Calibration Record Format (9)
Appendix B Internal page format of the vacuum leak calibration certificate (recommended format) (10)
Appendix C Calibration Uncertainty Evaluation Example (11)
Appendix D Leak rate unit conversion (15)
Introduction
JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "General Metrology Terms and
Definition", JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" and GB/T 3163-2007 "Vacuum Technology
Terminology together constitute the basic series of documents formulated by this specification.
This specification refers to BSEN20486.2018 "Non-destructive testing leak detection gas reference leak calibration"
(NonDestructiveTesting-LeakTesting-CalibrationofReferenceLeaksforGases),
ASTME908.1998 (2012) "Standard Practice for Calibration Gas Reference Leaks" (Standard Practicefor
CalibratingGaseousReferenceLeaks) was formulated, using the basic principles, and specific methods
And technical indicators have been refined, supplemented and modified.
Compared with JJG793-1992, except for editorial changes, the main technical changes of this specification are as follows.
---The scope of application is expanded from standard leaks to all vacuum helium leaks, and the measurement range is extended downward by two numbers
Magnitude
---The standard device adds a flowmeter method calibration device and a relative comparison method calibration device;
---The calibration method adds the flowmeter method and the relative comparison method;
--- Increase the uncertainty evaluation method and the conversion method of mass flow and molar flow.
The release status of previous versions of this specification.
---JJG793-1992.
Calibration specification for vacuum helium leak
1 Scope
This specification applies to vacuum helium leaks with a leak rate value in the range of (1×10-10~1×10-4) Pa·m3/s
calibration.
2 Reference documents
This specification refers to the following documents.
JJF 1001-2011 General measurement terms and definitions
JJF 1008-2008 Pressure measurement terms and definitions
GB/T 3163-2007 Vacuum technical terms
GB/T 3164-2007 Graphical symbols for vacuum technology
BSEN20486.2018 Non-destructive testing leak detection gas reference leak calibration (NonDestructive
Testing-LeakTesting-CalibrationofReferenceLeaksforGases)
ASTME908.1998 (2012) Standard Practice for Calibration Gas Reference Leaks (Standard Practice
forCalibratingGaseousReferenceLeaks)
For dated reference documents, only the dated version applies to this specification; for undated references
The latest version (including all amendments) is applicable to this specification.
3 Terms and units of measurement
3.1 Term
3.1.1 Leak
When the pressure or concentration of the gas inside and outside the closed container is different, the gas can be leaked from one side of the wall
Small holes, defects or gaps and penetration elements or leaks to the other side.
[JJF 1008-2008, definition 11.31]
3.1.2 Vacuumheliumleak
Leaks calibrated and used under the condition that the outlet pressure is lower than 1kPa using helium as the tracer gas.
3.1.3 Conductanceleak
It can be ideally regarded as a leak in a long capillary with one or more discrete channels.
[GB/T 3163-2007, definition 6.1.2]
3.1.4 Permeationleak
The gas penetrates through a type of leak in the membrane (thin wall).
3.1.5 Leakrate
Under specified conditions, the flow rate of a specific gas through the leak.
[GB/T 3163-2007, definition 6.1.9]
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