19
6. Operation
6.1.
Open feedwater access (see
4.4
).
6.2.
Check the power cable for damages and connect the plug to a grounded mains
socket. Turn the power switch (fig. 9/6) to
I
(on).
6.3.
After several second of loading, the display shows (figure 21):
Water quality
and grade (fig. 21/6);
Stage
of the operation (fig. 21/7);
Total Organic Carbon
, or TOC, content (fig. 21/5);
Temperature
of the water (fig. 21/8);
Status
of the unit (fig. 21/11);
Dispense
status;
Volumetric
dispense setting;
Tank level
.
Figure 21. Control panel and display
6.4.
Lowering and controlling TOC
(only for
HPLC
and
Bio
models). To lower the total
organic carbon (TOC) content, previously purified water passes through organics
photooxidation module and a polishing module to remove resulting products. To
maintain a low TOC level, we recommend constant water recirculation in the storage
tank. TOC level measurements are performed during recirculation stage, and the val-
ues are displayed after the unit at least partially fills the tank and performs at least
one recirculation cycle , and the unit is at Filling, Grade I water dispensing or Recir-
culation stages (fig. 21/7).
6.5.
Checking water quality
. Press the
Mode
key (fig. 21/3) to check the water quality.
Unit changes the stage (fig. 21/7) and quality values appear (fig. 21/6).
6.5.1. Diagnostic screen (figure 22). Press the
Mode
key twice in quick succession. Display
will show the diagnostic screen that provide information and status for all sensors and
components, as well as the tank water level.