User Manual

Maintenance, cleaning, replacement MPP 350

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 GENERAL 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