10.
Complementary instructions for ATEX certified material
10.4 Particular dispositions when using a frequency inverter
The Albin peristaltic pumps have variable limits of working according to the discharge pressure, number of rotations of the pump
and temperature of the pumped product. These working limits are mainly imposed by the heating of the hose, on which the lifespan
is strongly dependent.
Within the framework of an application required to change the speed of the pump, the three following points will have to be checked.
- Temperature of pumped product
- Number of rotations of the pump
- Discharge pressure
The maximum values of use will be fixed at the determination of the pump whose copy is in the appendix.
10.5 Dry running the pumps
The Albin peristaltic pumps can function in the absence of liquid in the pump, without causing heating of the pump higher than
the classified of temperature T, in particular for the period of starting-up of the pump.
In fact, dry running the pump with blocked inlets or outlets generates too high a demand on the pump hose, and can generate
high internal temperatures because of the compression and decompression of the air locked up between the pump and the
blocked opening.
This type of dysfunction is not controllable by a safety device (of sensor type) because the pump is dry and the mechanical
constraints generated on the pump are low. Starting up the pump must thus be done after having checked that the inlet and
outlet are not blocked.
Nevertheless, dry running is not a normal function of the pump and if it doesn’t directly constitute a risk of ignition, it leads to
premature wear and tear of the hose. This type of function must be limited as much as possible
10.6 Replacement of parts
The parts should be replaced only by original Albin parts which correspond to the configuration of origin of the pump. If necessary,
the characteristics of the pump are modified and the ATEX certification of the pump is not applicable any more.
With each hose replacement, the adjustment of compression of the hose must be controlled and adapted to the instructions of
adjustment registered in the handbook.
The technicians who intervene on ATEX material must be ATEX trained and approved
10.7 Solvents incompatible with the pump’s seals
The user must make sure that the seals and the hose with which the pump is equipped are compatible with the pumped product
and the products used in the cleaning of the pump.
10.8 Possible leakages of pumped liquid
The possible leakages of liquid by the pump’s seals do not generate a risk of ignition as long as the explosive
atmosphere surrounding the material corresponds to the type of atmosphere for which it was planned.
You have to check that in contact with the atmosphere surrounding the pump or of a material located near the
pump, the pumped liquids are not likely to create an explosive atmosphere for which the material was not envisaged.
The rupture of the hose, which is a wearing part, can involve important leakage of pumped liquid. A hose detector
makes it possible to detect these leakages and will stop the pump if necessary
.
