In the absence of having all the necessary components assembled together for testing, perhaps I am overthinking the matter.
Using ET's "Vacuum - Evacuation Time Calculator" and entering the following values, I receive an answer of 7.41 seconds
- Vacuum Chamber Volume: 2 US gal / 0.00757 m³
- Pump Flow Rate: 1.5 CFM / 0.000707921175 m3/s
- Initial Pressure: 14.76 in HG / 500 mbar
- Final Pressure: 29.53 in HG / 1000 mbar
Is this result correct or have I made an error in my conversions and/or the use of the calculator?
Even if drawing the chamber down from atmospheric to 29+ in HG required 2 min, this would be adequate for the application.