CleanFit P CPA 471
5 Maintenance
Hauser
19
5
Maintenance
#
Warning!
Risk of injury! Before starting maintenance work on the assembly, make sure that the
process line and the tank are depressurised, empty and rinsed. Move the assembly to
the »Maintenance« position and arrest it using the stop bolt lock (see Fig. 4.2).
The measurement can be corrupted by electrode fouling or malfunction, e.g.:
•
deposits on pH-sensitive part of glass electrode
→
causes poor response time and low sensitivity or slope.
•
fouling or blocking of diaphragm
→
causes poor response time and unstable measurement.
To ensure a reliable measurement, the electrodes must be cleaned at regular intervals.
The frequency and intensity of the cleaning operation depend on the measuring
medium.
5.1
Cleaning
Clean the electrode:
•
before every calibration
•
at regular intervals during operation as necessary.
Cleaning can take place manually by removing the electrode or via the rinse fitting (if
fitted).
!
Note!
•
Do not use any abrasive cleaning agents for cleaning the electrodes. This can lead to
irreparable damage to the measuring surfaces.
•
After cleaning, rinse the rinse chamber with copious amounts of water (possibly
distilled or de-ionised). Any residual cleaning agent can falsify the measurement
drastically.
•
After every cleaning operation, re-calibrate the measuring system.
Manual cleaning
All parts in contact with the medium, e.g. the electrode and the electrode holder, must
be cleaned at regular intervals. Remove the electrode in the reverse sequence of
operations 1 to 12 described in Chapter 3.3.1.
•
Light dirt can be removed using suitable cleaning agents.
•
Severe fouling must be removed with a soft brush and then a suitable cleaning agent.
•
Remove persistent fouling by soaking in a liquid cleaner.
Cleaning via the rinse fitting
(only when equipped accordingly)
The rinse fitting is used to clean the assembly automatically, e.g. using
Autoclean CPC 20.
