The invention relates to a method for creating a treatment gas atmosphere in a furnace for thermally treating metallic materiel.

It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter.

According to the invention, the enrichment gas and/or the other constituents of the treatment gas is/are supplied to the furnace via one or more special nozzles, so-called film nozzles.

One of the gas component such as a clean air is removed from a first outlet (12) port and the separated gas component is removed from a second outlet (13) port.

Constituents of the gas that react with the catalyst result in a different signal pattern for the sensors depending on their location in relation to the catalyst.

Usually it is much easier to measure the emissions from “contaminants” like the small fraction of dust mixed in the gas to estimate the total disc mass.

In passing over a membrane (28), a portion of a gas mixture in intimate contact with the membrane wall experiences a change in density as components of the gas selectively diffuse through the membrane (28).

(c) a substance set out in column 1 of Part 1 of Schedule 1 that is a component of natural gas in its gaseous form;