9.
Press
[Menu]
.
ð
A continuous display appears.
10. Press the
[Clickwheel]
to go to the "Concentration" contin‐
uous display (ppm or %).
11. You can enter the desired mass concentration using the
[Clickwheel]
.
Tab. 15: 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
11.2.5.4
‘Analogue’
operating mode (settings on the
‘Concentration’
function)
‘Menu / Information
è
Settings
è
Concentration
è
Concentration control
è
Max. flow of main medium
è
...’
The "Concentration input" in
‘Analogue’
operating mode is
intended for metering a substance into pipework containing a
medium flowing at a variable rate in such a way that it has a spe‐
cific mass concentration in the flow.
CAUTION!
Risk of incorrect concentrations
– After adjusting, check whether the concentra‐
tion at various flows corresponds to the
required 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% sulphuric acid:
35 %)
n the density of the feed chemical is known - see the feed chem‐
ical safety data sheet (e.g. with 35% sulphuric acid: 1.26 kg/l ≜
g/cm
3
)
n a flow meter with analogue output 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.
The prerequisites are that:
Procedure
Set up /
‘Menu’
65
To Next Page
Loading...
Need help?
General
