English (GB)
32
7.2 Check calibration
In check calibration, the calibration value is
calculated by reading the consumption of chemical in
a specific period and comparing this with the number
of dosing strokes performed in the same period.
This calibration method is very accurate and
especially suitable for check calibration after long
periods of operation or if direct calibration is
impossible. The calibration can for instance be
carried out when the chemical tank is replaced or
filled.
To carry out a check calibration, proceed as follows:
1. Stop the pump by pressing the button.
2. Read the counter and note the number of dosing
strokes, see section 5.17.
3. Read and note the quantity in the chemical tank.
4. Start the pump by pressing the button and let
it run for at least 1 hour. The longer the pump is
operating, the more accurate the calibration will
be.
5. Stop the pump by pressing the button.
6. Read the counter and note the number of dosing
strokes, see section 5.17.
7. Read and note the quantity in the chemical tank.
8. Calculate the dosed quantity in ml and the
number of dosing strokes performed during the
operating period.
9. Calculate the calibration value as follows:
(dosed quantity in ml/dosing strokes) x 100.
10. Set the calculated value in the calibration menu.
8. Maintenance
The pump is maintenance-free. However, it is
recommended to keep the pump clean.
The dosing pump is produced according to the
highest quality standards and has long life. The
pump incorporates wear parts such as diaphragm,
valve seat and valve balls.
To ensure long life and to reduce the risk of
disturbance of operation, visual checks should be
carried out regularly.
It is possible to order dosing heads, valves and
diaphragms in materials which are suitable for the
specific liquid to be pumped. See the product
numbers at the end of these instructions.
9. Service
Before returning the pump to Grundfos for service,
the safety declaration at the end of these
instructions must be filled in by authorized personnel
and attached to the pump in a visible position.
Note: If a pump has been used for a liquid which is
injurious to health or toxic, the pump will be
classified as contaminated.
If Grundfos is requested to service the pump, it must
be ensured that the pump is free from substances
that can be injurious to health or toxic. If the pump
has been used for such substances, the pump must
be cleaned before it is returned.
If proper cleaning is not possible, all relevant
information about the chemical must be provided.
If the above is not fulfilled, Grundfos can refuse to
accept the pump for service. Possible costs of
returning the pump are paid by the customer.
The safety declaration can be found at the end of these
instructions (only in English).
Note: The replacement of the supply cable must be
carried out by an authorised Grundfos service
workshop.
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