8.2 Check Calibration; Service; Regular Maintenance; 9.3 Perform Service - Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento

8.2 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
2. Read the counter and note the number of dosing
strokes, see section
3. Read and note the quantity in the chemical tank.
4. Start the pump by pressing the
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
6. Read the counter and note the number of dosing
strokes, see section
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.
32
button.
6.17 Counters.
button and let
button.
6.17 Counters.

9. Service

In order to ensure a long service life and dosing
accuracy, wearing parts such as diaphragms and
valves must be regularly checked for signs of wear.
Where necessary, replace worn parts with original
spare parts made from suitable materials.
Should you have any questions, please contact your
service partner.

9.1 Regular maintenance

Interval Task
Check, if liquid leaks from the drain
opening (fig. 1) and if the drain
opening is blocked or soiled.
If so, follow the instructions given in
section 9.4 Diaphragm
Check, if liquid leaks from the dosing
head or valves.
If the pump was operated with
Daily
damaged or loose dosing head
screws, immediately separate the
pump from the power supply! Follow
the instructions given in section
9.5 Operation with loose dosing head
screws.
If necessary, tighten valves and cap
nuts, or perform service (see
9.3 Perform
Clean all pump surfaces with a dry
Weekly
and clean cloth.
Check dosing head screws.
If necessary, cross-tighten dosing
Every 3 head screws with a torque wrench at
months torque 4.06 ft·lb (+ 0.37/- 0 ft·lb)
(5.5 Nm (+ 0.5/- 0 Nm)). Replace
damaged screws immediately.
Every 2
years or
Replace diaphragm and valves (see
8000
9.3 Perform
operating
hours*
* For media which result in increased wear, the
service interval must be shortened.
9.2 Cleaning
If necessary, clean all pump surfaces with a dry and
clean cloth.
breakage.
service).
service)