Xylem MPP 350 - Manual (Page 18)

Maintenance, cleaning, replacement MPP 350
18 ba75434e02 07/2005
5.4 D.O. module: Cleaning the electrodes
Caution
Before starting to work with the sensor, please note the G ENERAL MAIN -
TENANCE INSTRUCTIONS on page 14.
General
information
Cleaning is only required in cases of slopes too small or too large (sensor
cannot be calibrated) that cannot be resolved by changing the membrane cap
and electrolyte solution.
Cleaning the electrodes
Unscrew the membrane cap.
Caution: Electrolyte solution!
For disposal of the membrane
cap and electrolyte solution,
see section 5.7.
Rinse the sensor head with
deionized water. Using the rough side of the
wet SF 300 polishing strip,
polish off any contamination
from the gold working elec-
trode using light pressure.
Caution: Do not use any con-
ventional sandpaper or glass-
fiber brushes.
Rinse the sensor head with
deionized water. Wipe the counter electrode
with a lint-free paper towel
and carefully remove any
loose white deposits. Immerse the sensor head in-
cluding the counter electrode
in RL/G cleaning solution.
Allow to react for 1 to 3 min-
utes.
SF 300
RL-G