Vacuum Pump Capacity Calculation Xls -

Materials (steel, plastics, seals) release trapped molecules under vacuum. [ Q_out = \textSurface Area \times \textOutgassing Rate (specific to material) ]

The fundamental equation for evacuating a chamber from atmospheric pressure to a target vacuum is: vacuum pump capacity calculation xls

Real systems leak. Use the pressure rise test : Isolate the pump and measure pressure increase (ΔP) over time (Δt). [ Q_leak = V \times \frac\Delta P\Delta t ] vacuum pump capacity calculation xls

This is the gas initially in the chamber. [ Q_vol = \fracV \times (P_1 – P_2)t ] vacuum pump capacity calculation xls

[ t = \fracVS \cdot \ln\left(\fracP_1P_2\right) ]