Metering Rate Calculation (Volumetric Measurement) - Ecolab EMP Kompakt II DN20 Manuel D'utilisation

Commissioning
7.6

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).
Fig. 17: Metering rate calculation (volumetric measurement)
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
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.
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.
The metering rate for the pump is to be preset to enable a concentration of
100 ppm to be delivered. If another concentration value is required, the
correct setting for this concentration must be determined by repeated
"volumetric dosing" with different metering rate settings.
NOTICE!
If the metering rate setting is changed and/or if a chemical other than
ST-DOS T-300 is used, this will invalidate the DVGW certification for the
device.
417101964 Rev. 4-04.2019 40