Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Maintenance
General items
Opening the lid (cover)
Before opening the lid for maintenance reasons observe following items:
• Do not remove the lid while circuits are alive.
• No dust deposits or whirlings are present.
• No rain can enter into the housing.
Frequent check
of the unit
To ensure durable safety in hazardous locations and with electrical safety, following items must be
checked frequently depending on the application:
• Mechanical damage or corrosion of any components (housing side and sensor side) and of the field
wiring cables.
• Thight sealing of the process connection, cable glands and enclosure lid.
• Properly connected external PE cable (if present).
• For process temperatures over 230°C the delivered sealings of the flanges and of the sliding
sleeve must be checked regulary for good order and condition.
Cleaning
If cleaning is required by the application, following must be observed:
• Cleaning agent must comply with the materials of the unit (chemical resistance). Mainly the lid
sealing, cable gland and the surface of the unit must be considered.
The cleaning process must be done in a way, that:
• The cleaning agent cannot enter into the unit through the lid sealing or cable gland.
• No mechanical damage of the lid sealing, cable gland or other parts can happen.
Units with EHEDG certification, which are used in the respective EHEDG applications, must be cleaned
dry only (Type ED Class I). Furthermore the respective regulations must be observed.
A possible accumulation of dust on the unit does not increase the maximum surface temperature and
must therefore not be removed for purposes of maintaining the surface temperature in hazardous
locations.
Function test
A frequent function test may be required depending on the application.
Execution of function test see page 29
Production date
The production date can be traced by the serial number on the typeplate. Please contact the
manufacturer or your local distrubutor.
Spare parts
All available spare parts are stated in the selection list.
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