ProMinent DULCO flex Control Operating Instructions Manual page 53

Tab. 10: Possible values of adjustable variables
Adjustable variable
Volume in l
Mass concentration in %
Mass density in kg/l
'Analog' operating mode (settings for the 'Concentration' function)
12.2.3.4
The prerequisites are that:
Procedure
Lower value
0000.1
000.01
0.50
'Menu / Information è Settings è Concentration
Concentration control è Max.throughput main medium è ...'
è
The "Concentration input" in
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.
the flowing medium has the same density as water (1 kg/l ≜ g/cm
n
the mass concentration of the feed chemical is known - see the feed
n
chemical safety data sheet (e.g. with 35% sulfuric acid: 35 %)
the density of the feed chemical is known - see the feed chemical
n
safety data sheet (e.g. with 35% sulfuric acid: 1.26 kg/l ≜ g/cm
a flow meter with analogue output is hydraulically installed and con‐
n
nected to the external input of the metering pump.
The measurement unit for the liquid volume is set in the
n
Volume unit' menu.
è
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
metering mode.
3. Select
'0...20 mA' or '4..20 mA' in the 'Select analog' menu item and
4. Set
press the
Upper value
9999.9
100.00
2.00
'Analog' operating mode is intended for
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.
CAUTION!
The precision of the concentration is strongly dependent
on:
– the precision of the metering pump calibration.
– the precision of the inputs.
'Analog' operating mode and confirm with the [Clickwheel] .
[Clickwheel] .
'Menu'
Set up /
Increment
0000.1
000.01
0.01
3 )
3 )
'System
'Automatic' - 'on'
53