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Norm

ISO 6145-7:2009

Ausgabedatum: 2009 03 18

Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 7: Thermal mass-flow controllers

ISO 6145-7:2009 specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use ...
ZURÜCKGEZOGEN: 2018 11 27
Herausgeber:
International Organization for Standardization
Format:
Digital | 15 Seiten
Sprache:
Englisch
Aktuell Gültig:

ISO 6145-7:2009 specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of commercially available thermal mass-flow controllers.

If this method is employed for the preparation of calibration gas mixtures, the optimum performance is as follows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standard uncertainty by a coverage factor k = 2, is not greater than 2 %.

If pre-mixed gases are used instead of pure gases, mole fractions below 10-6 can be obtained. The measurement of mass flow is not absolute and the flow controller requires independent calibration.

The merits of the method are that a large quantity of the gas mixture can be prepared on a continuous basis and that multicomponent mixtures can be prepared as readily as binary mixtures if the appropriate number of thermal mass-flow controllers is utilized.

ISO 6145-7:2018
2018 11 27
Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass...
Norm
ISO 6145-7:2009
2009 03 18
Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 7: Th...
Norm
ISO 6145-7:2001
2001 04 19
Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 7: Th...
Norm
Norm
ISO 6145-7:2018
Ausgabedatum : 2018 11 27
Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers