Servicing
Instruction Manual ScrubberGuard
14830E/2
95
9.3.1.2
Measurements with temperature dependency
Many measurements are extremely dependent on the temperature. This dependency is cor-
rected automatically by the sensor. Nonetheless, the calibration solutions and sensor should
still have approximately the same temperature as the calibration is only made when the
measuring value and temperature are stable.
9.3.1.3
Cleaning the sensor tip
CAUTION!
Damage to the sensors due to improper cleaning.
Improper handling of the sensor when cleaning can lead to damage. Note the following
when cleaning the pH sensor:
▪
Only the following materials may be used for cleaning:
- Cleaning set
- Max. 1 molar 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 sensor may be cleaned with the clean-
ing agents as detailed above.
▪
After cleaning the sensor with acid, rinse with water and then immerse in storage solu-
tion (e.g. 3-molar potassium chloride solution) for 15 minutes in order to prevent slow
reaction times during measurement.
▪
Rinse the pH sensor with water after cleaning.
▪
Only touch the measuring tip of the pH sensor when absolutely necessary.
9.3.1.4
Mechanical handling of the pH sensor
The blue glass ball on the pH sensor is particularly sensitive and should be protected against
drying out (hydrated layer). The measuring tip of the sensor should only be dabbed clean,
and not mechanically cleaned. A cleaning kit and cleaning instructions are available in the
event of heavy soiling.
CAUTION!
Damage to the sensors due to improper handling.
The pH sensor must be handled with care as it has a sensitive glass membrane. The pH sen-
sor can be damaged if cleaned improperly or if the measuring tip is touched carelessly.
pH sensors should be protected against drying out. If not used for a sustained period, the
measuring tip must be stored in storage solution (e.g. 3-molar potassium chloride solution).
▪
Only touch the measuring tip of the pH sensor when absolutely necessary.
▪
Only use cleaning agents according to Section 9.3.1.3.
