$$Q_s = Q \times C_v$$
): The initial pressure in the chamber (usually atmospheric). The target vacuum level. Evacuation Volume ( ): The total internal volume of the chamber and piping. Pumping Speed ( ): The rate at which the ejector removes gas. 2. Core Calculation Formulas Evacuation Time Calculation
Wm=WsERcap W sub m equals the fraction with numerator cap W sub s and denominator cap E cap R end-fraction Step C: Nozzle Throat Diameter (
$$Q_s = Q \times C_v$$
): The initial pressure in the chamber (usually atmospheric). The target vacuum level. Evacuation Volume ( ): The total internal volume of the chamber and piping. Pumping Speed ( ): The rate at which the ejector removes gas. 2. Core Calculation Formulas Evacuation Time Calculation
Wm=WsERcap W sub m equals the fraction with numerator cap W sub s and denominator cap E cap R end-fraction Step C: Nozzle Throat Diameter (