wtw TresCon NOx-N, Operating Manual

Page: 79 / 112

NOx-N Maintenance
3 - 31 ba43110e05 01/2011
3.8 Displaying/changing service intervals
The service intervals are used to deliver information on the time
remaining until important service activities. After a service interval has
expired, a corresponding message is output on the display, e.g.
„Replace pump tubings“. In this menu you can view and change the
service intervals.
Note
The factory setting of the service intervals is based on the values
obtained from practical experience in normal wastewater treatment
plants. Only change the settings if the instrument is subject to special
conditions.
Service intervals The time remaining until the next service appears on the display under
the duration of the interval. If you change a service interval, the display
of the remaining time also changes automatically correspondingly. The
following table contains the service interval settings and the value
ranges as well as the recommended interval times selected in the
factory for the respective operating mode.
Displacing
the pump
tubings Replacing the
pump tubings Replacing the
tubing
system
Value range 1 ... 999 d 1 ... 999 d 1 ... 999 d
Basic
setting 30 d 180 d 180 d
Operating with
the PurCon 30 d 180 d 180 d
Operating
without the
PurCon 30 d 180 d 90 d
1 Measuring mode
Select the NOx-N measuring module with
68
.
2 Call up the Parameters NOx-N menu with
3
. The main
menu appears on the display.
3 Select the Service menu item with
68
and confirm with
3
. The service menu appears.
4 Select the Service intervals menu item with
68
and
confirm with
3
.
Changing the service
intervals