7.5 Metering rate 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).
Connect pump ready for operation on delivery side (operation-specific pipe length incl. all
pressure-maintenance valves, injection valves etc. connected during normal operation)
Set the pump to the required metering rate
(see section 7.3 "Setting the metering capacity (mechanical)").
Fill a suitable measuring cylinder with the product to be metered and insert a suction pipe.
Run the pump for exactly 1 minute and measure the quantity sucked out of the measuring
cylinder.
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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