ISO 6145-7:2018
Current
The latest, up-to-date edition.
Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 7: Thermal mass-flow controllers
Hardcopy , PDF
English, French
27-11-2018
ISO 6145 is a series of documents dealing with various dynamic methods used for the preparation of calibration gas mixtures. This document specifies a method for continuous preparation of calibration gas mixtures, from nominally pure gases or gas mixtures by use of thermal mass-flow controllers. The method is applicable to preparation of mixtures of non-reacting species, i.e. those which do not react with any material of construction of the flow path in the thermal mass-flow controller or the ancillary equipment.
If this method is employed for preparation of calibration gas mixtures the optimum performance is as follows: the relative expanded measurement uncertainty U, obtained by multiplying the 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 calibration gas mixture can be prepared on a continuous basis and that multi-component mixtures can be prepared as readily as binary mixtures if the appropriate number of thermal mass-flow controllers is utilized.
NOTE Gas blending systems, based upon thermal mass-flow controllers, and some including the facility of computerization and automatic control, are commercially available.
| Committee |
ISO/TC 158
|
| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| DIN EN ISO 6145-7:2019-07 | Identical |
| EN ISO 6145-7:2010 | Identical |
| EN ISO 6145-7:2018 | Identical |
| PN-EN ISO 6145-7:2019 | Identical |
| BS EN ISO 6145-7:2018 | Identical |
| NF EN ISO 6145-7 : 2018 | Identical |
| NEN-EN-ISO 6145-7:2019 en | Identical |
| I.S. EN ISO 6145-7:2018 | Identical |
| NS-EN ISO 6145-7:2018 | Identical |
| ÖNORM EN ISO 6145-7: 2019 | Identical |
| SS-EN ISO 6145-7:2019 | Identical |
| UNE-EN ISO 6145-7:2020 | Identical |
| IEC 60079-29-1:2016+AMD1:2020 CSV | Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases |
| CEI EN IEC 62282-7-2:2025-05 | Fuel cell technologies – Part 7-2: Test methods - Single cell and stack performance tests for solid oxide fuel cells (SOFCs) |
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