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The highest purity steels are made by removing hydrogen from molten metal under vacuum. Combine this with vacuum impregnation or coating and you have the building blocks for anything from Aeroplanes to Xylophones
The TAG (Turbo & Active Gauge) controller is a small, compact, low cost pumping system Controller, which is suitable for a wide range of vacuum applications. It is a 24V controller that is compatible with all Edwards DX and nEXT turbopumps. It contains no power source and thus you either need to supply your own power or buy the optional power supply. In addition to a turbopump it can control a backing pump, a vent valve, an air cooler and an Edwards active gauge.