De Dietrich DTE1158X Guide D'utilisation page 21

The emulsion zone
With a volume of approximately 5 litres, it allows emulsions, which are produced
with the use of frozen products or food which is too full of water, to develop without
risk of overflow. The balls of emulsion are broken up on the edge of the latter zone,
thus avoiding the disasters which the emulsion of boiling oil might otherwise cause.
The drainage and recovery zone
It is here that all the splashes are recovered which sometimes arise during cooking.
This zone, with its sloping curves, drains all the small drops back into the frying
bath.
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The safety thermostat is a second temperature measure. In the event of a problem,
it automatically cuts off the supply of electricity to the fryer. Reconnection is not
automatic. It must be carried out manually by an approved engineer. He must
likewise make a complete change of the frying bath.
TIMER
The left knob operates the timer, which has a sound alarm. It enables you to avoid
forgetting something cooking.
The timer must be set on at least 2'.
To stop the sound alarm, switch to position 0.
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