The system allows for a maximum mixing speed of 9 RPM and a minimum speed of 2 RPM. The control system includes start/stop buttons as well as a mains isolator. The mixer is started at the slowest speed of 2 RPM. The operator increases the speed up to 9 RPM by twisting the variator gearbox control. When finished, the operator reduces the speed back to 2 RPM; this slow speed allows the user to stop the drum in the vertical orientation ready for unloading. This model doesn't include a mix timer or docking function like the non-ATEX version (image shows non-ATEX controls).