Please select and order
€84.27
excl. VAT
Add to cart
Norm

ÖNORM EN ISO 6145-7

Issue date: 2011 02 15

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Thermal mass-flow controllers (ISO 6145-7:2009)

This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methods used for the preparation of calibration gas mixtures. This pa...
Withdrawn: 2011 03 15
Publisher:
Austrian Standards International
Format:
Digital | 19 Pages
Language:
German | English
This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methods used for the preparation of calibration gas mixtures. This part 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.
ÖNORM EN ISO 6145-7
2019 06 15
Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 7: Thermal mass-...
Norm
ÖNORM EN ISO 6145-7
2011 03 15
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Th...
Norm
ÖNORM EN ISO 6145-7
2011 02 15
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Th...
Norm
Norm
ISO 6143:2001
Issue date : 2001 05 31
Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures
Norm
ISO 7504:2001
Issue date : 2001 11 22
Gas analysis — Vocabulary
Norm
ISO 6143:2001
Issue date : 2001 05 31
Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures
Norm
ISO 6145-1:2003
Issue date : 2003 11 12
Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 1: Methods of calibration
Norm
ISO 7504:2015
Issue date : 2015 05 11
Gas analysis — Vocabulary
Norm
ÖNORM EN ISO 6145-7
Issue date : 2011 03 15
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Thermal mass-flow controllers (ISO 6145-7:2009)