The "Concentration input" in
‘Manual’
operating mode is intended for
metering a substance into pipework containing a medium flowing at a con‐
stant rate (
‘main flow’
) in such a way that it has a specific mass concen‐
tration 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 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
‘Manual’
-
‘Operating mode’
(settings potentially configured
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
‘Main medium flow’
(in the pipework) and then press the
[Clickwheel]
.
6. Set the
‘Feed chemical mass concentration’
and press the
[Clickwheel]
.
7. Set the (mass)
‘Feed chemical density’
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. Enter the required mass concentration of feed chemical in the main
flow by pressing and turning the
[Clickwheel]
.
Tab. 8: Possible values of adjustable variables
Adjustable variable Lower value Upper value Increment
Flow in m
3
/h
0000.1 9999.9 0000.1
Mass concentration in % 000.01 100.00 000.01
Mass density in kg/l 0.50 2.00 0.01
The prerequisites are that:
Procedure
Set up /
‘Menu’
50
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