KROHNE OPTISYS SLM 2100, Handbook, Page: 74 / 88

6
SERVICE
74
OPTISYS SLM 2100
www.krohne.com 01/2017 - 4002737304 - MA OPTISYS SLM 2100 R04 en
Cleaning or replacement of air filter
• Loosen the 2 nuts in the ventilation shaft.
• Remove the ventilation shaft by pulling it up.
• Remove the cover of the fan.
• Clean or replace the air filter.
For assembling the ventilation please repeat the steps above in reverse order.
6.2.1 Cleaning unit (optional)
The cleaning unit is an optional feature, nevertheless it is part of the standard menu to allow an
easy upgrade of the standard sludge level meter.
The sensor cleaning feature will be active either time based or cycle based. The cycle based
mode is only valid when the device is operating in level or profile measuring mode. In zone
tracking mode cleaning can be controlled only time based.
A measurement cycle is finished when the sensor reaches the bottom position in profile mode or
the position of the sludge level to search in level mode.
The sensor cleaning is a two phase process, in the bottom position the cleaning is enabled and
the sensor is moved back to the garage for cable cleaning. When the sensor has reached the
upper position the sensor cleaning phase starts and the sensor is moved through the cleaning
head in the garage. The number of passes is selectable in the cleaning menu.
Select the cleaning activation type in the menu first. In case of the activation mode is set to
"timer interval" the sensor cleaning is periodically performed when the selected time interval
has elapsed. By setting the cleaning activation mode to "counter interval" the sensor cleaning is
performed each time the selected number of measurement cycles has been conducted. Note
that the zone tracking measuring mode is not cycle based, in this mode for proper operation of
the sensor cleaning select the time based activation mode.
If an external water pump is connected to the device then the menu item "pump lead time" can
be used to delay the sensor cleaning process until pump system pressure has been setup. The
value of the pump lead time can remain at 0 seconds when no external water pump is in use.
The menu item "cleaning cycle" is defining the number of passes of the sensor through the
cleaning head. An external water pump can be controlled by the sludge level meter when it is
enabled in the menu item external pump. Each cleaning cycle the external pump is switched on
when the water valve will be activated. Note that when the cleaning sequence is finished the
water valve remains open for 1 minute to empty cleaning system for protecting the system
against freezing at low temperatures.
DANGER!
If the air filter is blocked the meter can catch fire which could result in health and safety hazards
or damage of the plant equipment.
WARNING!
Turn off the device during maintenance of the fan and fan filter.