Vacuum Part 2. It Still Sucks…
Calculating Conductance • a is radius (ID) • F o is for orifice, F t is for tube • L/a is ratio of length/radius (ID) • Divide by 2 for each right-angle bend
Vacuum Materials • Stainless type 304 • Aluminum (not anodized) • Pyrex • Viton o-rings • NO PLASTIC!!!
Quick-release flanges • Quick flange (QF) • Klein flange (KF; more common?) • Also NW or DN • Names based on internal diameter DN16KF is 16mm (16-50mm) • Limited to 120C, 10 -8 mbar
Sizes we will likely find. www.vacuumresearchcorp.com/pdfs/valves/ nwflanges 06.pdf
Large flange standard • Typically designated ISO, LF, or MF • Bolted or clamped • O-ring or knife- edge seal
ISO flange dimensions
Conflat flanges • Often designated ‘CF’ • Cu gasket, knife-edge seals on flanges • Best choice for UHV
Feedthroughs
Mechanical Pressure Gauges Manometer Anaeroid
Mechanical Pressure Gauges Capacitance manometer Bourdon Tube (diaphragm gauge)
Thermal ConductivityPressure Gauges Thermocouple Gauge Pirani Gauge
Ionization Gauges Hot filament gauge Cold cathode gauge
Comparison of gauge types
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