Instruction Manual AquaMaster
Servicing
68
12745E/4
8.1.1.3
Cleaning the sensor tips
CAUTION!
Damage to the sensors due to improper cleaning.
Improper handling of the sensors when cleaning and the use of excessively aggressive clean-
ing agents can lead to damage to the sensors. Note the following when cleaning the sen-
sors:
Only the following materials may be used for cleaning the sensors:
- Cleaning set
- Max. 1M hydrochloric acid (max. 3.6%)
- Ethanol
The use of abrasive cleaning agents is not permitted.
Only the tips and the lower shaft section of the sensors may be cleaned with the clean-
ing agents as detailed above.
After cleaning redox/ORP and pH sensors with acid, rinse with water and then immerse
in storage solution for 15 minutes in order to prevent slow reaction times during meas-
urement.
Rinse all sensors with water after cleaning.
Only touch the electrodes or measuring tip of the pH and redox/ORP sensor when abso-
lutely necessary.
8.1.1.4
Mechanical handling of the sensors
The blue glass ball on the pH sensor is particularly sensitive and should be protected against
drying out (hydrated layer). This also applies to the redox/ORP sensor, whose tip is wrapped
with a fine platinum wire. The measuring tips of these sensors should only be dabbed clean,
and not mechanically cleaned. A cleaning kit and cleaning instructions are available in the
event of heavy soiling.
The oxygen and conductivity sensor are slightly more robust than the two glass sensors (pH
and redox/ORP). However, they should still be handled with care.
CAUTION!
Damage to the sensors due to improper handling.
pH sensors and Redox/ORP sensors must be carefully handled. pH sensors have a sensitive
glass membrane; redox sensors have a very fine platinum wire at the measuring tip. These
sensors can be damaged by carelessly touching the measuring tip, by improper cleaning.
Do not let pH and Redox/ORP sensors dry out. If they are not going to be used for a while,
put the tips in a storage solution (e.g. 3 molar solution of potassium chloride).
Touch the electrodes and measuring tips of the pH and Redox/ORP sensors only when
absolutely necessary.
Use only cleaning agents in accordance with Section 8.1.1.3.
Oxygen sensors and Conductivity sensors are mechanically somewhat more robust.
These sensors should nevertheless be handled with sufficient care.