Xylem ISE Electrodes Ca 60 - Handbuch (Seite 19)

19
Aging
Please note that every electrode undergoes a natural
aging process. The response time increases and the
slope decreases with the age of the electrode. The
following factors shorten the lifetime considerably:
• Incorrect storing
• Special measuring conditions (e.g. organic solutions,
frequent measuring with high concentrations of
interfering ions)
• High temperatures
• High changes in temperature
The warranty does not cover damage caused by
measuring conditions and mechanical damage.
Maintenance
• For combination electrodes: replenish used reference
electrolyte solution.
•
In case of increased response times of the electrode
perform the following activities:
- Polish the membrane surface using an SF/K
polishing strip. To do so, moisten a polishing trip
with deionized water, and with circular movements
polish the membrane surface for approx. 30
seconds.
- Subsequently place the electrode into diluted
standard solution for approx. 5 minutes.