Process Unit 73 LF - Knick

Process Unit 73 LF
Probe Rinsing
You can only make use of the probe rinsing function
if your Process Unit is equipped with option
352. Without this option, the menu reads ”Probe
Rinsing (Optional)”. This menu item cannot be selected.
Probe rinsing is used, for example, for automatic
rinsing and cleaning of the conductivity cell.
To do so, a rinsing cycle is started.
A rinsing cycle can be started:
timer controlled after expiration of the user defined
interval,
manually in the menu,
by a current pulse (see page 9–46) at the current
input (if current input has been set as control
input, see page 9–43),
remote-controlled via interface (see page
9–49).
You can define an interval in the range 0.1 to
999.9 h. The interval extends from the start of one
rinsing cycle to the start of the next rinsing cycle.
To turn off the automatic rinsing cycle, set the interval
to ”000.0 h”.
Before starting a rinsing cycle, you must enter the
individual step durations on the Parameter Setting
level, menu item ”Probe Rinsing” (see page 9–47)!
A rinsing cycle comprises the following steps:
Start of Rinsing Cycle:
NAMUR contact ”functional check” and contact
”probe” are activated, output current 1 (and 2)
and controller output are frozen, limits are disabled,
and menus are locked, the
interval timer is reset.
Rinsing Lead Time:
User defined waiting time until contact ”rinsing”
closes. This allows you to monitor response
times of the valve ”probe”, for example .
First Rinsing:
The contact ”rinsing” is closed for the (user defined)
duration of first rinsing.
9–44 Capabilities