Development of an Automatic Static Volumetric Method Based on Loop Injection

The static volumetric method, described in ISO 6144:2001, is a common tool to generate primary reference gas mixtures. As it is a manual and bulky system it was aimed at developing an automatic and more compact device resulting in a prototype of an automatic static volumetric method. Based on the injection of a pure compound by means of a loop instead of a syringe and housed in a portable 19” rack it fits for both laboratory use and field measurements. The generation of the gas mixture is controlled by computer running software elaborated during the construction and testing period. The most crucial point, the evaluation of the loop volumes, was solved developing two techniques allowing traceability to SI units. So far gas mixtures of nitrogen monoxide in nitrogen in the range 10-9 mol/mol and carbon monoxide in air in the range 10-6 mol/mol have been generated and the uncertainties of the gas mixtures were calculated. Comparisons to other calibration techniques like dynamic volumetric method (NO), permeation (NO2) and direct sampling of primary reference material (CO) confirmed the differences of the methods within their uncertainties.

LAGLER Friedrich;  GERBOLES Michel;  BOROWIAK Annette; 

2007-02-12

SPRINGER

JRC33703

https://publications.jrc.ec.europa.eu/repository/handle/JRC33703,