19
GB
7. Repairs
The pump must be switched off and repaired immediately if
liquid leaks out below the pump motor
(Fig. 11)
.
Repairs should only be made by the manufacturer or authorized
Lutz-dealers. Only use original Lutz spare parts.
Before sending back the appliance, following must be ob-
served:
• Residuals in the appliance can cause danger to the
environment and human health. The appliance must be
completely emptied, rinsed and cleaned.
• Please advise which liquid has been pumped. A respective
safety data sheet must be attached to the return
consignment.
8. Operation in hazardous location or pumping
flammable liquids
8.1 General
The eccentric screw pumps of series B70V-HD are ATEX-
approved according to II 1/2 G c IIB T4.
Inside of the container and the pump, requirements of category
1 are valid. For all attached parts, e.g. coupling, gear and drive
motor, requirements of category 2 are valid.
8.2 Special conditions
When the drum pump is used, all additional components fitted
to the connecting part (coupling, gear, drive motor, etc.) have to
be outside of the mobile container. In this respect, the require-
ments of unit group II (sub-class II A), category 2, temperature
class T4 have to be met.
It has to be ensured that only a stator made of PTFE is built-in.
Caution:
the 75.1 size must not be used to pump flammable
fluids.
The drive motor (electrical or with compressed air drives) may
not exceed an output of 1.0 kW and a speed of 900 1/min.
The drum pump must not be employed for non-mobile opera-
tion. The operation of the pump has to be monitored during
the pumping process so that dry running and empty running
phases are restricted to the absolutely minimum.
8.3 Equipotential bonding and earthing
Before starting up the pump, it is essential to establish an
equipotential bonding between the pump, the container to be
emptied and the container to be filled.
The potential between the pump and the container to be emptied
is equalized by connecting the equipotential bonding cable
(Ref.-No. 0204-994). Paint and dirt should be removed from the
connecting points in order to improve the conductivity.
The conductive connection between the full and empty
containers is achieved by means of a conductive substrate
(e.g. conductive gratings).
A conductive transition between container and subsurface
must be guaranteed.
Legend:
(1) Equipotential bonding cable, (2a) Conductive substrate or
connection of an equipotential bonding cable to each of the
two drums, (2b) Galvanic connection (low contact resistance
towards earth), (3) Conductive hose, (4) Conductive connection
between hose and hose connector, (5) Pump tube category 1/2,
(6) Explosion proof motor
