Grundfos Dosing monitor, Installation And Operating Instructions Manual

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4
CONTENTS
Page
1. Technical data 4
2. General description 4
2.1 Definitions 5
2.2 Logic 5
2.3 Operation with vent valve 5
3. Mounting and setting of dosing monitor 6
1. Technical data
Maximum pressure: 10 bar.
Maximum liquid temperature: 35°C.
Maximum liquid viscosity: 20 mPas.
Pulse transmitter
(reed contact), maximum load: 48 VAC/VDC, 0.5 A.
Materials in contact with
the pumped liquid:
PMMA/PVC/
PVDF/FKM.
2. General description
Fig. 1
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.
When used together with a DME pump , the monitor
will only operate if it is mounted on the suction side
of the pump.
When used together with a DMS pump , the monitor
will operate if it is mounted on the suction or dis-
charge side of the pump.
The dosing monitor should be connected to the "low
level" input (pins 2 and 3). This input must be config-
ured for dosing monitoring. Consequently, it cannot
be used as a level input.
Once the input has been set to dosing monitoring
and a dosing monitor has been connected and set,
the dosing monitoring function will be active.
Note: Make sure that the rubber gaskets supplied
with the monitor are fitted as indicated by a * in fig. 1.
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The in-
stallation and operation should also be in
accordance with local regulations and ac-
cepted codes of good practice.
T
M
02
20
29
32
01
/ T
M
02
20
30
32
01
/ T
M
02
2
0
3
1
32
01
Dosing stroke
measured
Dosing stroke
measured
Dosing stroke
measured
Monitor mounted on
pump suction side
(DME and DMS)
Monitor mounted on
pump discharge side
(DMS only)
Monitor mounted in dosing
tube
DMS: In dosing tube
DME and DMS: In suction tube
*
*
*
*