Alfa Laval LeviMag, Инструкция по эксплуатации, Страница: 39 / 68

7 ATEX specific conditions for safe use
7.5 Positioning of level switch
To prevent dry running, a level switch must be installed to shut down the mixer and depending on the ATEX zone classification
inside the tank, the level switch must correspond to different safety levels inside the tank:
- Zone 0 - the level switch must correspond to b2 according to EN 80079-37.
- Zone 1 - the level switch must correspond to b1 according to EN 80079-37.
- Zone 2 - the level switch does not need to correspond to a specific safety integrity level.
Ensure the liquid level during operation is always above the impeller to prevent dry running.
Tank size, media properties and operating mode have an influence on the operating limits and must not be changed without a
new evaluation.
Operating with variable speed please pay special attention to section 7.2 Requirements, section 7.4 Monitoring the frequency
converter and section 8.12 Connection to frequency converter.
Media level A B (Option) C
State Minimum media
“Midway”
Full tank
Level switch requirement Yes Yes Option
Media level on illustration 1 1+2 1+2+3
Media level measured
Speed Level
Off Moderate
High
Maximum speed in Hz 0 Hz
NOTE
NO VORTEX
Note!
A
B
C
1
2
3
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