Maintenance
Cleanfit P CPA472D
22
Hauser
5
Maintenance
#
Warning!
Risk of injury!
Before starting maintenance work on the assembly, make sure that the process line and the tank are
depressurized, empty and rinsed.
Move the assembly to the "Service" position and lock the retractable pipe by the stop lock bolt.
5.1
Cleaning the assembly
To ensure a reliable measurement, the assembly and the sensor must be cleaned at regular intervals.
The frequency and intensity of the cleaning operation depend on the process medium.
5.1.1
Manually operated assembly
All parts in contact with the medium, e.g. the sensor and the sensor holder, must be cleaned at
regular intervals. Remove the sensor
1)
.
• Remove light dirt using suitable cleaning agents (see chapter "Cleaning agents").
• Remove severe fouling with a soft brush and a suitable cleaning agent.
• Remove persistant fouling by soaking in a liquid cleaner and if neccessary by cleaning with a soft
brush.
5.1.2
Pneumatically operated assembly
Pneumatically-controlled cleaning can be carried out regularly via the rinse connection and the
corresponding equipment, e.g. with the fully automatic cleaning and calibration system
Topcal S CPC310.
5.2
Cleaning the sensor
You have to clean the sensor:
• before every calibration
• regularly during operation
• before being returned for repair
You can remove and clean the sensor manually or perform cleaning during automatic operation
2)
via the rinse connection.
!
Note!
• Clean ORP electrodes only mechanically and with water, do not use any chemical cleaning
agents. These cleaning agents apply a potential to the electrode that takes several hours to decay.
This potential causes measuring errors.
• Do not use any abrasive cleaning agents. This can lead to irreparable damage of the sensor.
• After cleaning the sensor, rinse the rinse chamber of the assembly with copious amounts of water
(possibly distilled or de-ionised). Otherwise, remaining residues of cleaning agent can corrupt
measurement.
• If required, re-calibrate after cleaning.
1)
in reverse sequence of operations to the installation procedure
2)
with the corresponding assembly equipment only
