Standard

SN EN ISO 6145-7:2011

Mar 2011 Withdrawn

Note: Latest version: SN EN ISO 6145-7:2019

Existing or new amendments and versions must be purchased separately.

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Abstract

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.

Products specifications

Standard from INB
Published: March 1 2011
Withdrawn: September 1 2019
Effective: March 1 2011
Document type: EN
Pages
ISBN:

ICS: 71.040.40
Publisher: SNV
Distributor: SNV
National Committee: INB/NK 162

Product Relations

Replaced by: SN EN ISO 6145-7:2019
Adopted from: ISO 6145-7:2009, IDT

Extended editions Extended editions (0)

Version history Related Corrigenda and Amendments (0)

Version history History (2)

SN EN ISO 6145-7:2019