Patent ID: 9719969
Date: 2017-08-01
CPC Classifications: B01D,G01N

Claim:
1. A method of providing a pre-concentration device for use in detecting molecular contamination in a gas analysis system in a vacuum environment, the method comprising: providing a hollow element having a gas entrance opening for receiving gas from a vacuum environment in a collection phase; providing an inner wall for adsorbing the gas onto the inner wall in the collection phase, and desorbing the gas from the inner wall in a transfer phase; providing a gas outlet for transferring the gas in the transfer phase, and providing a filler element that is movable from a first position outside the hollow element in the collection phase to a second position inside the hollow element in the transfer phase which second position leaves open a transfer channel to the gas outlet along the inner wall; wherein the hollow element has an inner space bounded by the inner wall, and the inner space has a conical shape, and the filler element has a shape corresponding to the conical shape of the inner space such that, in the second position, the transfer channel is formed between the filler element and the inner wall.