2. Switch off the metering pump.
ð
The metering pump is ready for operation.
Stroke length and stroke rate
–
Select as large a stroke length as possible with gaseous
feed chemicals.
–
Select as high a stroke rate as possible for good mixing.
–
For precise metering using quantity-proportional
metering, do not set the stroke length to less than 30 %.
With SEK types: not less than 50%.
Use the diagrams to adjust the capacity
1. In the product-specific operating instructions: Open at the page with
the diagram of the pump type.
2. First determine the correction factor: To do so, highlight the oper‐
ating pressure for the application in the "Correction factor
dependent on operating pressure" diagram.
Go from the calculated value vertically upwards to the graph and
then horizontally to the left and read off the correction factor.
3. Divide the required capacity by the calculated correction factor and
highlight this figure on the "C [l/h]" axis in the "Capacity dependent
on stroke length and stroke rate" diagram.
4. Move from this point horizontally to the left and then move from the
intersections with the straight lines for the adjustable stroke rates,
move vertically downwards to the "Stroke length [s]" axis.
5. Set one of the stroke rates obtained in this way and the associated
stroke length on the metering pump.
The measurements to calculate the capacity for the corre‐
sponding diagrams were performed with water. The correc‐
tion factor was determined at a stroke length of 70%. Spread
of pump capacities across all material versions: 5 to +15 %.
Setting the precise dosage
Start up
19
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