CAUTION!
Danger of too high concentrations
The metering pump can continue to dose, if the flow falls or
stops entirely.
– System precautions must be taken to prevent the
metering pump from continuing to dose in such circum‐
stances.
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 chemical
safety data sheet (e.g. with 35 % sulphuric acid: 1.26 kg/L ≜ g/cm
3
)
n The measurement unit for liquid volume is set in the
‘System’
menu in
the
‘Unit’
submenu, see chapter "Settings under the 'System' menu".
CAUTION!
The accuracy of the concentration is strongly dependent on:
– the accuracy of the metering pump calibration.
–
the accuracy of the entries.
1. Calibrate the metering pump if it is not yet calibrated - see chapter
"Settings for the "Calibrate" function".
2. Select
‘MANUAL’
operating mode (settings which may already exist
from other operating modes remain saved.).
3. From the
‘ADJUSTMENT’
menu, select the
‘CONCENTRATION’
menu.
4. Under the first menu option, set
‘On’
for working with the concentra‐
tion display and press the key
[P]
.
5. Set the flow and press key
[P]
.
6. Set the mass concentration for the feed chemical and press key
[P]
.
7. Set the density of the feed chemical - after pressing key
[P]
, the
continuous display appears.
8. Using key
[i]
change to the "Concentration" continuous display (ppm
or %).
The prerequisites are that:
Procedure
Set up
49
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