26
6.1 Direct calibration
Before calibration, make sure:
• that the pump is installed with foot valve, injection
valve, etc. in the existing system.
• that the pump is running at the counter pressure it
is supposed to operate at (adjust the counter
pressure valve, if required).
• that the pump is operating with the correct suction
lift.
To carry out a direct calibration, proceed as follows:
Action Pump display
1. Prime the dosing head and the suction tubing.
2. Stop the pump. The green LED is flashing.
3. Fill a graduated glass with dosing liquid, Q
1
.
DME 2: approx. 40 ml DME 19: approx. 500 ml
DME 8: approx. 150 ml DME 48: approx. 1000 ml
DME 12: approx. 250 ml
4. Read and note the quantity Q
1
.
5. Place the suction tubing in the graduated glass.
.
6. Go to the calibration menu, see section 4.7.
7. Press the button twice.
8. The pump is performing 100 dosing strokes.
9. The factory-calibration value appears in the display.
10. Remove the suction tubing from the graduated
glass and read Q
2
.
11. Set the display value to Q
d
= Q
1
– Q
2
.
12. Confirm with the button.
13. The pump is now calibrated and returns to the
operating display.
Set value
to Q
d
Operating display
Q
1
Q
2
Q
d
Grundfos.bk Page 26 Wednesday, May 21, 2008 11:21 AM
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