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What is sealing

The term sealing refers to a situation where a disc shaped sample has different gas compositions on separate sides of it.

The sealing is achieved by utilizing a hollow tube that has same diameter than the sample, and placing the sample at the end of that tube. Between them a sealing ring ensures gas tightness, and the sample disc is pressed on the tube with a steady force. One type of atmosphere is led inside the tube (called inner chamber), and another type to outside (called outside chamber). This arrangement allows various types of measurements and tests to be performed on the disc. Various electrode contacts, sensors, gas flow utilities, catalysts etc. can be placed on both the inner and the outer chamber according to the needs of the test setup, even optical port can be used to have optical access to the sample disc.

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