20
GB
8.4 Conductive hoses / hose connections
Anyway the hose connected to the pressure joint of the drum
pump must be sufficiently electrically conductive – with respect
to electrostatic charges.
The ohmic resistance between the fittings – in this case
between the pump tube and the nozzle – may not exceed a
limited value depending on the respective hose type.
1. Identification of the hose with the symbol „M“
limited value
≤
10
2
W
(Fig. 12 -
À
)
2. Identification of the hose with the symbol „
W
“ limited
value
≤
10
6
W
(Fig. 12 -
)
The hose connection must ensure a highly conductive transition
between hose and pump tube, as well as between hose and
nozzle.
If this is not the case, all conducting parts (such as the metal
mouth piece at the end of the hose) shall have to be earthed
separately.
Connecting of conductive hoses with armatures to the
hose lines requires the identification and examination to
DIN EN 12 115.
8.5 Explanation of the zone classification when
using eccentric screw pumps for flammable
liquids
- Zone 0 generally prevails inside the drum or container.
- The boundary between zone 0 and zone 1 is determined
by the bunghole of the drum or the upper edge of the
container.
- Rooms in which media are transferred from one
drum or container to another are always classified as
zone 1.
- For drum and container pumps this means that:
1. Only pump tubes of unit group II, category 1/2 G may be
used to pump flammable liquids. They comply with the
regulations for use in zone 0.
2. Regardless of their type of protection, explosion proof
motors may not be used in zone 0. Exceptions may only
be made by the local supervisory authorities.
3. Lutz motors of series ME of type "explosion proof
enclosure - increased-safety" comply with the regulations
for unit group II, category 2 G. They are allowed for use
in zone 1.
8.6 Traceability
Products manufactured by Lutz Pumpen for potentially explosive
atmospheres are identified by an individual batch number which
allows them to be traced. This number provides the year of
construction and the design of the equipment.
This product is an appliance for potentially explosive
atmospheres. In this regard and in compliance with the EC ATEX
94/9 Directive, provisions must be made to ensure ascending
and desccending traceability.
Our ATEX notified quality system ensures this traceability up to
the initial point of delivery.
Except as otherwise agreed in writing, anyone that guarantees
to redeliver said equipment undertakes to put in place a system
that allows for equipment that is not conform to be recalled
if necessary.
