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Quick Start Guide
6
Maintenance
6.1
Opening the lid (cover)
Before opening the lid for maintenance reasons, consider the following:
•
Do not remove the lid while circuits are live.
•
Ensure that no dust deposits or airborne dusts are present.
•
Ensure that rain does not enter the housing.
6.2
Regular checks for safety
To ensure robust safety in hazardous locations and with electrical safety, the
following items must be regularly checked depending on the application:
•
Mechanical damage or corrosion of the field wiring cables or any other
components (housing side and sensor side).
•
Tight sealing of the process connection, cable glands, and enclosure lid.
•
Properly connected external PE cable (if present).
6.3
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 shaft sealing, 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 shaft sealing,
lid sealing or cable gland.
•
No mechanical damage of the shaft sealing, lid sealing, cable gland or
other parts can happen.
6.4
Function test
A frequent function test may be required depending on the application.
Observe all relevant safety precautions related to work safety (e.g. electrical
safety, process pressure, etc).
This test does not prove if the level switch is sensitive enough to measure
the material of the application.
Function tests are done by covering the forks with a suitable solids material
and monitoring if a correct change of the signal output from uncovered to
covered happens.
22
October 2019
Quick Start Guide
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