The VTech 40 Automatic Pre-Evacuation Systems perform an automatic pre-evacuation cycle, followed by a vacuum decay test, before signaling to the operator by the touch screen and stack light that the test is complete. Since the system is automatic, it is possible to use unit number-specific preset vacuum parameters (i.e. time and vacuum level) to perform this operation, taking away the need to monitor these factors manually. The pumps can perform either the same or different cycles simultaneously; unused pumps can be turned off.

The VTech 40 can be configured as follows:

   -VTech 40-1 with one vacuum pump
   -VTech 40-2 with two vacuum pumps
   -VTech 40-3 with three vacuum pumps
   -VTech 40-4 with four vacuum pumps