Tab. 10: Possible values of adjustable variables
Adjustable variable Lower value Upper value Increment
Volume in l 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
12.2.3.4
‘Analog’
operating mode (settings for the
‘Concentration’
function)
‘Menu / Information
è
Settings
è
Concentration
è
Concentration control
è
Max.throughput main medium
è
...’
The "Concentration input" in
‘Analog’
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.
CAUTION!
Risk of incorrect concentrations
– After adjusting, check whether the concentrations at
various flows correspond to the desired result.
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 flow meter with analogue output is hydraulically installed and con‐
nected 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. Check whether the metering pump is set to
‘Automatic’
-
‘on’
metering mode.
3. Select
‘Analog’
operating mode and confirm with the
[Clickwheel]
.
4. Set
‘0...20 mA’
or
‘4..20 mA’
in the
‘Select analog’
menu item and
press the
[Clickwheel]
.
The prerequisites are that:
Procedure
Set up /
‘Menu’
53
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