SF6 Apparatus Contamination and Evacuation Software
This screen shows the final predicted contamination level of your circuit breaker if your initial levels were measured and your purification efficiency stayed at 90% for all three purification runs.

The calculator will perform similarly if you opt to save your gas then allow fresh air to enter your tank, one, two or three times.
This calculator helps you plan your jobs better as well as gives your apparatus technicians a field calculation tool to use in conjunction with contamination detection and evacuation equipment.