Metering - ProMinent Sigma X Operating Instructions Manual

a)
F
max
P1
F1
F2
0 I 1 I 2
Fig. 31: Frequency-current diagram for a) Lower side band, b) Upper side band

'Metering'

9.3.2
'Metering profile'
9.3.2.1
Using this type of processing, you can control a metering pump using the
current signal as shown in the diagram below. You can enter the curve
points I and F in the
However, you can also control two metering pumps for different feed
chemicals via a current signal (e.g. one acid pump and one alkali pump
using the signal of a pH sensor). To do this, connect the pumps electrically
in series.
P2
I [mA]
20
'Upper side band'
Using this processing type, you can control a metering pump using the
current signal as shown in the diagram above. You can enter the curve
points I and F in the
Everything functions according to the
cessing.
Curve points
To define the above curves, enter any two points P1 (I1, F1) and P2 (I2,
F2) in the
to operate at current I1, F2 is the stroke rate at which the pump is to
operate at current I2...).
Error mess. i < 4 mA
You can select in the
pump should issue an error message and stop with current signals below
3.8 mA (Standard).
'Menu / Information è Settings è Metering è ...'
'Menu / Information è Settings è Metering è Dosing profile è ...'
'Metering è Dosing profile' you can precisely match the pump
Under
metering flow over time against the requirements of the particular applica‐
tion - see "Functional description" chapter.
'Curve points' menu.
b)
F
max
F2
F1
0
B0089
'Curve points' menu.
'Curve points' menu (F1 is the stroke rate at which the pump is
'Error message i < 4 mA' menu item whether the
'Menu'
Set up/
P2
P1
I 1 I 2 I [mA]
20
'Lower side band' type of the pro‐
49