CleanFit P CPA 472
5 Maintenance
20
Hauser
Selecting cleaning agents
The selection of cleaning agent depends on the type of fouling. The most frequent fou-
ling and the associated cleaning agents are listed in the table below:
!
Hinweis!
Do not use solvents containing halogen for cleaning. This could destroy the plastic com-
ponents on the assembly.
!
Hinweis!
Only clean redox electrodes mechanically. Chemical cleaning applies a potential to the
electrode that takes several hours to decay. This potential causes measuring errors.
5.2
Calibration
Careful and regular calibrations are indispensable to ensure reliable and precise
measurement. Calibration cycles depend on the application and the required measure-
ment accuracy.
In practice, calibration cycles must be determined on a case by case basis. At the start,
we recommend frequent calibration, e.g. one a week, in order to familiarise yourself with
the running characteristics.
When carrying out the calibration, always refer to the calibration instructions of the as-
sociated measuring transmitter (see Operating Instructions of the measuring transmit-
ter).
Type of contamination
Cleaning agent
Greases and oils
Substances containing tensides (alkaline) or water-
soluble organic solvents (e.g. alcohol)
Calciferous deposits, metal hydroxide deposits,
heavy biological deposits
3% HCl
or with Chemoclean:
HCl (10%) in injector thinned to approx. 3%
Sulphide deposits
Mixture of hydrochloric acid (3%) and
thiocarbamide (commercially available)
Protein deposits
Mixture of hydrochloric acid (01 molar) and
pepsin (commercially available)
Fibres, suspended substances
Water under pressure, poss. with surface-active
agents
Light biological deposits
Water under pressure
