Metering Capacity Calculation (Volumetric Measurement) - Ecolab Elados EMP III - E00 Manuel D'utilisation

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6.4

Metering capacity calculation (volumetric measurement)

The specified metering capacities in metering pumps are always determined under ideal
conditions (metering of water at 20 °C, short suction and metering pipes, rated back-
pressure, no pressure-boosting valves in the metering line).
As these conditions never occur in practice, you are advised to determine the actual
metering rate of the metering pump under prevailing local conditions (volumetric
measurement).
Fig. 7: Determining the dosing quantity (calibration)
1. Connect pump ready for operation on delivery side (operation-specific pipe length
incl. all pressure-maintenance valves, injection valves etc. connected during normal
operation)
2. Set the pump to the required metering rate
( Ä Chapter 6.2 'Setting the metering capacity (mechanical)' on page 38).
3. Fill a suitable measuring cylinder with the product to be metered and insert a suction
pipe.
4. Run the pump for exactly 1 minute and measure the quantity sucked out of the
measuring cylinder.
ð The value calculated in l multiplied by 60 equals the actual metering rate in l/h.
The volume of the measuring cylinder should be 1/50 of the required metering
pump rate in litres/h.
During volumetric measurement, the position of the suction tube may not be
changed.
The determined metering rate is only valid for the stroke length currently set.
Once the stroke length setting has been adjusted, the changed metering rate
must be determined anew.
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