5Regular testing

Check the Overfill Protection System at regular intervals,but at least once a year, to ensure that it is in good working order. It is the user’s responsibility to choose the type of test and the intervals. Type NB 220 QSF transducer can be checked to make surethat it is working properly by pressing the "Test" button (see next section "Type NB 220 QSF transducer").

Perform the test in such a way that evidence is provided that the Overfill Protection System operates properly when all its components interact with one another.This interaction takes place when the response level is reachedduring a filling procedure. If it is not practicable to fill up to response level, the level detector must be made to respond by means of a suitable simulation of the level or the physical measuring effect.If the level detector/transducer is otherwise identified as beingin good working order (excluding faults hindering its function), the test can also be carried out by simulating the corresponding output signal.

For further information about methods of testing, please refer to VDI/VDE Guideline 2180, Sheet 4.

Testing Type NB 220 QSF transducer

Operation of the Overfill Protection System can be tested with the aid of the Test button ("Prüfen") integrated into the TypeNB 220QSF transducer.Keep the Test button ("Prüfen") pressed. After a maximum oftwo seconds the "Alarm" lamp should have lit up red with an audible signal. After the heating time the Overfill Protection System is primed again.If after pressing the button no alarm signal is triggered, or onlyone, the Overfill Protection System must be tested immediately.

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Overfill Protection System Type 76/NB 220