Scope Of Atex Categories For Mtr Pumps - Grundfos MTR Series Installation And Operating Instructions, Supplement

4. Scope of ATEX categories for MTR pumps

Group I
Product
Category M
1 2
MTR
None None
pumps
Motors None None
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.
ATEX-approved MTR pumps
Category 1
G D G
Zone 0 Zone 20 Zone 1
None None None
None None None
Group II
Category 2
D
Zone 21
MTR
VEM II 2G Ex e
VEM Ex II 2D Ex
tb III C T125 °C
ATB II 2G Ex d
Db
IIB T4 GB
Category 3
2)
G D
Zone 2 Zone 22
MTR MTR
II T3 VEM II 3D Ex tc
IIB T125 °C Dc
3