Cleanfit CUA451
Maintenance
Hauser
29
8
Maintenance
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WARNING
Medium flows out.
Risk of injury
‣
Only install the assembly when the process is deactivated.
‣
Before disassembling, always ensure that the process pipe and vessel are
unpressurized, empty and rinsed.
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Move the assembly to the service position.
‣
Close the ball valve.
8.1
Maintenance tasks
NOTICE
Unfavorable ambient conditions such as plant vibrations or atmospheres that
encourage corrosion can affect the functional integrity of the safety ring.
There is the danger of the ring breaking or coming free from the groove.
‣
Visually inspect for potential signs of corrosion.
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Make sure that the ring is fully seated in the groove.
8.1.1
Cleaning agent
The choice of cleaning agent depends on the degree and type of contamination. The most
common types of contamination and the appropriate cleaning agents can be found in the
following table.
Type of contamination
Cleaning agent
Greases and oils
Agents containing surfactants (alkaline agents) or water-soluble
organic solvents (halogen-free, e.g. ethanol)
Limescale deposits, metal hydroxide
buildup, lyophobic biological buildup
Approx. 3% hydrochloric acid
Sulfide deposits
Mixture of 3% hydrochloric acid and thiocarbamide (commercially
available)
Protein buildup
Mixture of 3% hydrochloric acid and pepsin (commercially
available)
Fibers, suspended substances
Pressurized water, possibly surface-active agents
Light biological buildup
Pressurized water
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CAUTION
Inhalation of solvents
Health hazard due to solvents
‣
Do not use any halogen-containing organic solvents or acetone. These solvents may
destroy plastic components of the sensor and are also suspected carcinogens (e.g.
chloroform).
8.1.2
Disassembling the assembly
Disassembling the sensor
All parts in contact with the medium, such as the sensor and the sensor guide, must be
cleaned regularly.
Use the following tools to remove the sensor: