Britannia Plodder has also got a level detector located
within the vacuum chamber which automatically starts and
stops the bottom screw.
Both of these detectors can be overridden from the local
machine control panel.
There is no clutch or vee belt drive, just solid
dependable, electro-mechanical power and there is a
bonus – both levels are variable speed at no extra cost.
It is impossible to overload the drive as it is
completely protected by safety overloads on the electric