Setting the unit to maintenance mode
Levels of setting to maintenance mode
The unit has to be taken out of operation for maintenance. This can be done at three levels, depending
on the nature of the maintenance:
1. Take the unit out of operation software-wise: this is necessary for maintenance where the
software plays a role, such as calibrating sensors.
2. Take the system pump (and supply pump, if present) out of operation by switching off the pump
switch(es): this is necessary for maintenance where the pumps absolutely must not start
operating, such as when cleaning the dirt filter or calibrating the pH measurement.
3. Switch off the unit by setting the main switch to off: this is necessary for maintenance where
the cabinet has to be open or where electrical parts may become wet, such as replacing electrical
components and cleaning the exterior.
• Please note that switching off the unit leads to alarm messages and possible
malfunctions of the external process computer.
• Set the unit to maintenance mode in ascending levels, not only the level concerned.
For example, for level 2, first perform level 1 and then level 2.
Maintenance work
Cleaning the exterior of the unit
1. Turn off the main disconnect switch of the unit.
2. Clean the exterior of the unit:
• Remove dust using a soft brush.
• Wipe-down the surfaces with a damp cloth.
• Do not use aggressive or abrasive cleaners: they may damage the plastic. Use warm
water only, with a few drops of washing-up liquid if necessary.
• Make sure that no water runs into the electrical components. For example, do not
spray water onto the unit and thoroughly wring out the cleaning cloth before use.
• Do not press too hard on the operating panel / display and the keyboard (if fitted)
when removing dirt.
3. Put the unit back into operation.
NutriJet - user - 00.00226
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