Evacuate unit to be bombarded to 0.1 mbar. Add 2 to 4 mbar of air and maintain a pressure of 2 to 4 mbar throughout bombarding process.
Operating current of the bombarder should not exceed 10 times the electrode rated operating current.
Do not reduce the pressure below 1 mbar during the bombarding process.
Stop when electrode shells are glowing cherry red over the entire surfaceand glass temperature is at 220°C.

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