CAUTION!
Danger of too high concentrations
The metering pump can continue to meter if the
flow falls or stops entirely.
– Take system-based precautions to prevent the
metering pump from continuing to meter in
these circumstances.
n the flowing medium has the same density as water (1 kg/l
≜
g/cm
3
)
n the mass concentration of the feed chemical is known - see the
feed chemical safety data sheet (e.g. with 35% sulphuric acid:
35 %)
n the density of the feed chemical is known - see the feed chem‐
ical safety data sheet (e.g. with 35% sulphuric acid: 1.26 kg/l ≜
g/cm
3
)
n a contact water meter is hydraulically installed and connected
to the external input of the metering pump.
n The measurement unit for the liquid volume is set in the
‘System
è
Volume unit’
menu.
CAUTION!
The precision of the concentration is strongly
dependent on:
– the precision of the metering pump calibration.
–
the precision of the inputs.
1. Calibrate the metering pump if it is not yet calibrated - see
chapter
‘Settings’
-
‘Calibration’
chapter.
2. Check whether the metering pump is set to
‘Automatic’
-
‘on’
metering mode.
3. Select
‘Contact’
-
‘Operating mode’
and simply confirm the
associated menu items with the
[Clickwheel]
(possible set‐
tings from other operating modes remain saved.)
4. Select
‘Concentration’
in the
‘Set up’
menu.
5. Set
‘active’
in the
‘Concentration control’
menu item and
press the
[Clickwheel]
.
6. Set the
‘Contact gap’
and press the
[Clickwheel]
.
7. Set the (mass)
‘Feed chemical concentration’
and press the
[Clickwheel]
.
8. Set the (mass)
‘Feed chemical density’
and press the
[Clickwheel]
.
ð
The
‘Concentration’
menu appears.
9.
Press
[Menu]
.
ð
A continuous display appears.
10. Press the
[Clickwheel]
to go to the "Concentration" contin‐
uous display (ppm or %).
11. You can enter the desired mass concentration using the
[Clickwheel]
.
The prerequisites are that:
Procedure
Set up /
‘Menu’
63
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