Xylem MPP 350 - Manual (Page 16)

Maintenance, cleaning, replacement MPP 350
16 ba75434e02 07/2005
5.3 D.O. module: Changing the electrolyte solution and mem-
brane cap
Caution
Before starting to work with the sensor, please note the G ENERAL MAIN -
TENANCE INSTRUCTIONS on page 14.
General
information
WTW delivers the D.O. module ready to use (see section 3). The electrolyte
solution and membrane cap must only be replaced if:
! a calibration error occurs and the membrane is heavily contaminated
! the membrane is damaged
! the electrolyte solution is exhausted.
Changing the electrolyte solution and membrane cap
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. Carefully rub and dry the
counter electrode with a lint-
free paper towel.
Immerse the sensor head in-
cluding the counter electrode
in RL/G cleaning solution.
Allow to react for 1 to 3 min-
utes.
Thoroughly rinse the sensor
head with deionized water. Water the counter electrode in
deionized water for at least
10 minutes.
RL-G H O
2