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Thermo Scientific Barnstead LabTower AFT
Pure water system
14. System control
General information
When the ON/OFF key is pressed, the system starts running either in the operating mode or in
the stand-by mode, according to the float switch.
The operating mode and the volume contained in the tank are shown in line 1 of the display and
the measured value of the permeate is shown in line 2.
Should a fault exist, then a fault message is given out across the potential-free output and is
shown in line 4 of the display. In the case of several simultaneous faults, then they are alter-
nately displayed.
14.1 User menu
All of the measured values, operating times and limiting values that are relevant for the user can
be set and read in this menu.
A press on the menu-key brings you into this menu. Each further press on the menu-key moves
you on from one menu prompt to the next.
Settings can be changed with the arrow keys and, when the appropriate value has been set, be
confirmed by pressing the Enter-key, which also takes you to the next menu prompt.
To simplify changing settings, a press on the UV-key allows you to select a certain number in a
numerical value that you wish to change. The arrow-keys can then be used to set a number
from 0-9 at this selected position.
14.1.1 Permeate conductivity:
A single press on the menu-key allows the permeate conductivity to be read and the limiting
value for the permeate conductivity to be set. Should this limiting value be exceeded, then the
th
"Lim.val.permeate" fault message is displayed flashing in the 4
line of the display.
(Measuring point LF 2)
Limiting value setting range: 0.1 – 150.0 µS/cm
Basic setting:
0.020 MΩxcm
Settings above 150.0 µS/cm result in the limiting value being switched off. The word
"Off".appears in the display.
The display shows:
Permeate
0.083 MΩxcm
Lim.val.permeate
50.0 µS/cm
25
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