6
1.3
Technical datasheet
1.3.1
Push flow situation
Considering the normal process flow direction, the situation where the fan is located upstream of
the explosion source (Figure: 7).
1.3.2
Pull flow situation
Figure: 7 Push flow situation
Considering the normal process flow direction, the situation where the fan is located downstream
of the explosion source (Figure: 8).
Figure: 8 Pull flow situation
1.3.3
Special conditions for safe use
Installation:
−
Installation, operation, maintenance and repair in areas with danger of explosions may only
be carried out by qualified personnel;
−
Ensure that no tools, nuts and bolts or assembly parts remain in the machine during assembly
or maintenance;
−
Selection and installation of the electrical parts within hazardous areas shall be fulfilled
according the EN60079‐14 and the installation instructions of the specific equipment;
−
No potential difference between all metal parts within the non‐return valve, or between
non ‐ return valve and earth may exist. Therefor earthing resistance between all metal parts
and earth shall be measured before operation and shall be maximum 1 M
Ω
between
