Dosing Monitoring - Grundfos DME 12 Montage- Und Betriebsanleitung

4.22 Dosing monitoring

A dosing monitor is available as an accessory. Sepa-
rate instructions are supplied with the monitor.
Fig. 23
Dosing stroke measured
Monitor mounted on the suction side of the pump
The dosing monitor is designed to monitor the dosing
of liquids which may cause gas accumulation in the
dosing head, thus stopping the dosing process even
if the pump is still operating.
For every measured dosing stroke, the dosing moni-
tor gives a pulse signal to the level input so that the
pump can compare performed dosing strokes (from
internal stroke sensor) with externally measured
physical strokes (from the dosing monitor). If an ex-
ternal dosing stroke is not measured together with
the internal dosing stroke, this is considered a fault
that may have been provoked by empty tank or gas
in the dosing head.
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