7 Maintenance
Topclean S
120
Hauser
7.1
Sensor cleaning and inspection
Sensor cleaning is integrated in the Topclean S system. Usually, additional or external cleaning of
the sensor is unnecessary. However, before inspecting the sensor, advance external cleaning may
be necessary.
7.1.1
External cleaning of the sensor
#
Warning!
• Protect hands, eyes and clothing from aggressive cleaning agents.
• Take the necessary protection measures if the sensor is taken directly out of a toxic or an
aggressive process.
• Switch the service switch to "Maintenance" to keep the assembly safely in the maintenance
position.
The selection of cleaning agent depends on the type of soiling. The most frequent soiling and the
associated cleaning agents are listed in the table below: "
!
Note!
• Only clean redox electrodes mechanically. Chemical cleaning applies a potential to the electrode
that takes several hours to decay. This potential causes measuring errors.
• After cleaning with compressed air, it takes about 5-8 mins until ISFET sensors have
re-established the control loop and the measured value has adjusted to the real value.
Type of soiling
Cleaning agent
"
Caution!
Danger of sensor destruction. No acetone may be used to clean an ISFET pH sensor, otherwise the material may be
damaged.
Greases and oils
Substances containing tensides (alkaline) or water-soluble
organic solvents (e.g. alcohol)
#
Warning!
Danger of caustic burns! Protect your hands, eyes and clothing when you use the following cleaning agents.
Calciferous deposits, metal hydroxide deposits, heavy
biological deposits
3% HCl
Sulphide deposits
Mixture of hydrochloric acid (3%) and thiocarbamide
(commercially available)
Protein deposits
Mixture of hydrochloric acid (0.1 molar) and
pepsin (commercially available)
Fibres, suspended substances
Water under pressure, poss. with surface-active agents
Light biological deposits
Water under pressure
Содержание Topclean S CPC30
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