12.2.3.2
‘Contact’
operating mode (settings for
‘Concentration’
function)
‘Menu / Information
è
Settings
è
Concentration
è
Concentration control
è
Contact distance
è
...’
The "Concentration input" in
‘CONTACT’
operating mode is intended for
metering a substance into pipework containing a medium flowing at a vari‐
able rate in such a way that there is a specific mass concentration in the
flow.
CAUTION!
Danger of concentrations being too high
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 cir‐
cumstances.
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% sulfuric acid: 35 %)
n the density of the feed chemical is known - see the feed chemical
safety data sheet (e.g. with 35% sulfuric 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
‘Set up’
-
‘Calibration’
chapter.
2. Select
‘Contact’
-
‘Operating mode’
and simply confirm the associ‐
ated menu items with the
[Clickwheel]
(settings potentially config‐
ured in other operating modes remain saved).
3. Select
‘Concentration’
in the
‘Set up’
menu.
4. Set
‘active’
in the
‘Concentration control’
menu item and press the
[Clickwheel]
.
5. Set the
‘Contact distance’
and press the
[Clickwheel]
.
6. Set the (mass)
‘Feed chemical concentration’
and press the
[Clickwheel]
.
7. Set the (mass)
‘Density dosing medium’
and press the
[Clickwheel]
.
ð
The
‘Concentration’
menu appears.
8.
Press
[Menu]
.
ð
A continuous display appears.
9. Turn the
[Clickwheel]
to go to the "Concentration" continuous dis‐
play (ppm or %).
10. You can enter the desired mass concentration using the
[Clickwheel]
.
The prerequisites are that:
Procedure
Set up /
‘Menu’
51
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