The VESDA computer is located on a small table behind the console by the Large Target Room entrance.

The VESDA system monitors smoke concentrations in the Vault, Tunnel, Small Target Room, Large Target Room, Control Room, and Dock. These systems are very sensitive to smallest concentrations of smoke, dust, steam, or any other particulate. Smoke concentration levels are connected to the main Fire Alarm System.

The VESDA system also monitors Oxygen concentrations in the pit below the accelerator and on the Dock, the two places where SF6 could accumulate if released.

The VESDA computer display looks like this: