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3
4. Scope of ATEX categories for MTR pumps
1)
Important: The user or installer is always responsible for checking that the group and category of the
pump correspond to the zone classification of the installation site.
2)
Note: The risk assessment done by Grundfos on the MTR pump which is ATEX category 3 G shows that
the pump can be upgraded to category 2 G by installing an ATEX-approved dry-running protection.
The dry-running protection must stop the pump if the liquid supply ceases.
Always check that the motor is marked for category 2 G.
Make sure that the combination of "MTR pump" and "dry-running protection" is described in the explosion
protection document. The responsibility rests with the installer or owner.
Product
ATEX-approved MTR pumps
Group I Group II
Category M Category 1 Category 2 Category 3
12 G D G D G
2)
D
Zone 0 Zone 20 Zone 1 Zone 21 Zone 2 Zone 22
MTR
pumps
None None None None None MTR MTR MTR
Motors None None None None None
VEM Ex II 2D Ex
tb III C T125 °C
Db
VEM II 2G Ex e
II T3
ATB II 2G Ex d
IIB T4 GB
VEM II 3D Ex tc
IIB T125 °C Dc
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