Development and performance analysis of a standard orifice flow calibration system

Akram, H. M.; Maqsood, M.; Rashid, Haris

doi:10.1063/1.3176469

Cited by 7 publications

(5 citation statements)

References 14 publications

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“… Invalidation of the Boyle's law (it remains valid when (a) the molar quantity of gas transferred through the system is maintained constant, (b) the process of pressure generation develops under isothermal conditions, and (c) the gas used for pressure generation obeys the ideal gas laws) and  The systematic errors in the measurement of the diŠerent quantities involved in the evaluation of the pressure generated in the calibration chamber 35) .…”

Section: Static Expansion Systemsmentioning

confidence: 99%

“…In the high and ultrahigh vacuum ranges, the dynamic expansion method, also known as the``oriˆce ‰ow method'' 35) and the``continuous expansion method'', is widely used for the calibration of vacuum gauges. Since at low pressures, about 10 -6 Pa, the generated pressure is aŠected by the outgassing of vacuum vessels and the adsorption of gas molecules on the inner surfaces of the vessels, the most suitable method is the dynamic expansion method 37) .…”

Section: Dynamic Expansion Systemsmentioning

confidence: 99%

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The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Khan¹,

Hong

Satar³

et al. 2016

J. Vac. Soc. Jpn.

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The calibration of vacuum gauges is mainly carried out in two ways; i) using the primary standards in which the readings of a test gauge are compared with the pressures generated by the standard, and ii) by comparison method in which the readings of the gauge under test are compared with the output signal of a secondary standard. The former type of standards are, usually, large and complicated systems comprising of vacuum pumps, chambers, valves, and gauges etc. while the later type are simply vacuum gauges, with superior qualities, which are attached to a properly designed calibration system. The Vacuum Measurement Lab at Korea Research Institute of Standards and Science (KRISS), Rep. of Korea, maintains primary standards as well as systems for calibration by comparison method. The KRISS primary standards can be used for the calibration purpose in the pressure range from ～10-7 Pa to 133 kPa. For bilateral as well as key comparison of these standards, KRISS has participated in the past where its standards have good degree of equivalence and hence international recognition, with other national standards like that of NIST, PTB, NPL(UK), etc. Besides, the KRISS Vacuum Measurement Lab also has comparison system which can be used for calibration by comparison method. However, here the KRISS primary vacuum gauge calibration standards are discussed brie‰y with the aim to provide enough information to the readers in a single paper.

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Section: Static Expansion Systemsmentioning

confidence: 99%

Section: Dynamic Expansion Systemsmentioning

confidence: 99%

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Khan¹,

Hong

Satar³

et al. 2016

J. Vac. Soc. Jpn.

View full text Add to dashboard Cite

show abstract

“…It is used for consistent vacuum measurements as well as reliable secondary standard because it is an internationally recognized reliable transfer standard from 10 -2 mbar to 10 -6 mbar [11]. This gauge operates by virtue of the viscous or frictional forces that gas molecules exert on the moving surface which is a small stainless steel ball.…”

Section: High Vacuum Gaugesmentioning

confidence: 99%

Selection of Appropriate Equipment for Designing Effective Vacuum System

Akram

Khan

2015

Review of Information Engineering and Applications

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Keywords: Physical concepts, Vacuum equipment, System designing. Contribution/ OriginalityAs far as the contribution of the study of this paper is concerned, it is one of very few studies which have investigated. It surely contributes in the existing literature with trustworthy methodology. It also contributes the first logical analysis. The paper's primary contribution is finding the true solution.

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“…Another important gauge, which is also used for high vacuum work is Spinning Rotor Gauge (SRG). It is used for consistent vacuum measurements as well as reliable secondary standard because it is an internationally recognized reliable transfer standard from 10 -2 mbar to 10 -6 mbar [11]. This gauge operates by virtue of the viscous or frictional forces that gas molecules exert on the moving surface which is a small stainless steel ball.…”

Section: High Vacuum Gaugesmentioning

confidence: 99%

Untitled

2015

Review of Information Engineering and Applications

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Vacuum systems are designed for a variety of research activities and industrial performs for different vacuum ranges depending upon the process prerequisite. It is very essential that these systems should be designed by selecting the vacuum equipment for proper vacuum generation, precise vacuum measurement and particular vacuum control for immense contribution to the process effectiveness, operational ease, working efficiency and quality product. In this paper effort has been made to clarify the physical concepts to use variety of vacuum pumps, gauges and valves to design different vacuum systems with diverse vacuum ranges for their up to mark effectiveness.

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Development and performance analysis of a standard orifice flow calibration system

Cited by 7 publications

References 14 publications

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Selection of Appropriate Equipment for Designing Effective Vacuum System

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