User Guide

51
IN-LINE CLEANING
The cleaning feature allows an automatic cleaning action of
the electrodes. To perform cleaning, the controller activates
an external device (pump).
Cleaning can be of two types:
• Simple cleaning: with water only, it can be triggered only
by a timer (periodical cleaning) or by an error for which a
cleaning action can be configured (i.e. a “Reference elec-
trode broken or dirty” error).
• Advanced cleaning (optional): with water and detergent,
it can be triggered by the following events:
• timer (setup item L.15 set to “ti”);
• digital input or RS485 command (external trigger; setup
item L.15 set to “E”);
• timer and digital input or RS485 command (external trig-
ger; setup item L.15 set to “ti E”);
• timer masked by external digital input (an external digital
input disables the cleaning; setup item L.15 set to “tiEM”);
• error for which a cleaning action is configured (i.e. a
“Reference electrode broken or dirty” error).
The type of cleaning action is selected through the relays
configuration and the time between two consequent cleaning
(if timer configured) has to be set through setup item L.01 for
simple cleaning and L.13 for advanced cleaning.
Cleaning actions do never take place if no relay is config-
ured for cleaning. The advanced cleaning requires both relays
3 and 4 configured for that kind of cleaning: relay 3 is asso-
ciated with water and relay 4 corresponds to detergent.
A minimum pause time has to be set for advanced cleaning
(setup item L.14) to avoid continuous cleaning due to the
external trigger. A cleaning action with detergent can be fol-
lowed by one or more actions without detergent, when desired.
Simple cleaning actions are performed in the following order:
• Rinsing time: the device enters hold mode; all relays con-
figured for simple cleaning are energized. If the device is in
normal measurement mode, the “rinSinG” message scrolls
on the LCD; otherwise (i.e. the device is in setup mode) the
cleaning is performed, but no message appears.