EBARA EVMS 1 Manuel D'utilisation Et D'entretien page 7

- The maximum pressure to which the device is
subjected;
- The fluid viscosity;
- The sensor material (compatibility with the fluid) and
the casing material;
- The ATEX protection classification in conformity with
ATEX pump homologation.
Correct assembly of the fluid monitoring device inside
the pump ensures that the seal is always lubricated by
the fluid during operation.
Under these conditions, the seal is guaranteed for conti-
nuous 24-hour operation for 6 months.
When replacing or controlling the seal, please refer to
the retailer or the help service.
6.3. PUMP OPERATION WITH AN OBSTRUCTED/
CLOSED DELIVERY VALVE
FIGURE 5 shows the assembly drawing of the flow rate
measurer (Mp) which must be assembled at delivery
so that the pump (P) blocks when falls below 5% of the
maximum return point.
In this case the electric contact (C) deactivates/activates,
disconnecting the electric power supply and rendering
the pump safe.
This value guarantees respect of temperature classification
on the internal and external surfaces of the pump.
6.4. DAMAGE CAUSED BY CHEMICAL NON
COMPATIBILITY BETWEEN LIQUID AND
COMPONENTS
Check the chemical compatibility between the fluid and
the pump parts.
6.5. CAVITATION
It is important to always check correct pump sizing (therefore
it is essential to verify the value needed by the pump using
the NPSH curves. These curves can be found in the product
general catalogues).
6.6. HOT FLUIDS
TAB. 2 gives the maximum temperature that the fluid can
reach in each temperature classification (these values are
permitted respecting the conditions expressed in point
4.3 NOTES).
It is important to install a reading device in order to guarantee
the maximum temperature of the fluid.
Should the limit value indicated in TAB. 2 be exceeded, a
release apparatus should switch the pump off.
The temperature measuring instrument must be in conformity
with the EN 13463-1 norm (category 4 of the Machines
Directive) and carry an ATEX marking that is compatible
with that of the pump. The switchboard which guarantees
intervention when the limit values are exceeded must be
FAILURE SAFE.
TAB.1: Classification of the maximum surface temperature
for apparatuses belonging to group II G (in accordance
with the EN 13463-1 norm)
Maximum pump
Temperature
surface tempera-
classification
ture (°С)
T1
T2
T3
T4
T5
T6
TAB. 2: Maximum temperature of the fluid in accordance
with the temperature classification
Temperature of the fluid
(°С)
> 125 *
< 125 *
*) Technical data given inside the User and Maintenance
Manual of the EVMS product.
7. MAINTENACE AND REPAIRS
Please refer to paragraph of the instruction booklet for
information on maintenance and repairs.
In addition, the pump must never be cleaned using dry cloths
(rubbing with dry cloths made of pure polyamide material
or cotton, for example, can cause electric discharges).
Some pump models have a bearing on the joint. No
maintenance needs to be carried out on the bearings,
which should work for 10,000 hours at a temperature of
40°C without problems.
When replacing or controlling the bearings, the user must
contact the retailer or the help service.
The same is true for the seal (para. 6.2).
Verify, proportionally to the operation conditions, that the
compression ratio is lower than the spontaneous ignition
limit of the processed fluid.
Correct motor alignment is indispensable for preventing
vibrations and faulty bearings.
Gas or vapour
mix ignition tem-
perature (°С)
450 >450
300 >300
200 >200
135 >135
100 >100
85 >85
Temperature
classification
T3
T4
EN
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