Grundfos DMH 28 Series Installation And Operating Instructions, Supplement page 6

3.2.2 Dosing head and valves
Grundfos supplies pumps meeting the requirements of
Directive 94/9/EC with appropriately approved dosing head/valve
combinations meeting the requirements of Directive 94/9/EC.
Pumps with other types of dosing head/valve
Caution
combination cannot be used in potentially
explosive atmospheres.
Stainless-steel valves must not be combined with
Caution
non-metal dosing heads.
The size of the dosing head (depending on the pump type) and
the dosing head material determine the suitability of the pump for
operation in potentially explosive atmospheres caused by media
of group IIB or IIC:
Dosing head
DMH DMH
material
251-255 257
PVC IIC IIB
Stainless steel,
IIC IIC
DIN 1.4571
Stainless steel,
IIC IIC
DIN 2.4610
PP IIC IIB
PVDF IIC IIB
Nameplate of pump with motor
Motor nameplate
II 2G Ex e II T3
II 2G Ex e II T3
II 2GD Ex die IIC T4
II 2GD Ex die IIC T4
Further information about using the pump can be found in section 4. Operating conditions.
6
Pump types
DMX 226 DMX 226
DMH
Head Head
28x
sizes 1-3 size 4
IIC IIC IIB
IIC IIC IIC
IIC - -
IIC IIC IIB
IIC IIC IIB
Pump nameplate
II 2G IIB T3
II 2G IIC T3
II 2GD IIB T4
II 2GD IIC T4
3.2.3 Motor
Grundfos pumps complying with Directive 94/9/EC are supplied
with motors that are complying with Directive 94/9/EC and have
been tested and labelled accordingly.
Alternatively, pump units can be supplied separately, and in this
case the user must fit a motor that complies with
Directive 94/9/EC.
Pumps with other types of motor cannot be used
Caution
in potentially explosive atmospheres.
3.2.4 Pump designation
The information meeting the requirements of Directive 94/9/EC
given on the pump as a non-electrical device depends on the
pump/motor configuration selected.
Pumps with motor are labelled in accordance with
Directive 94/9/EC. However, if the pump is supplied without a
motor, the labelling is only applicable to the pump unit.
Nameplate of the pump unit only (pump supplied without
motor)
Pump unit nameplate
II 2GD c IIB T130 °C
II 2GD c IIC T130 °C
Suitable for category 2,
explosion group / temperature class
Suitable for category 2,
explosion group /
temperature class
IIB / 130 °C
IIC / 130 °C
IIB / T3
IIC / T3
IIB / T4
IIC / T4