SensoLyt
®
900-P
Aging
17
ba75992e01
11/2012
11
Aging
Every pH electrode undergoes a natural aging process. With aging, the
responding behavior becomes slower and the electrode slope and asymme-
try change. Moreover, extreme operating conditions can considerably
shorten the lifetime of the electrode. These are:
Strong acids or lyes, hydrofluoric acid, organic solvents, oils, fats, bro-
mides, sulfides, iodides, proteins
High temperatures
High changes in pH and temperature.
The warranty does not cover failure caused by measuring conditions and
mechanical damage.
12
Maintenance and cleaning
Cleaning
Remove water-soluble contamination by rinsing with deionized water. Other
types of contamination have to be removed as follows while the contact time
with the detergents should be kept as short as possible:
NOTE
Hydrofluoric acid, hot phosphoric acid and strong alkaline solutions
destroy the glass membrane.
After cleaning
Rinse the electrode with deionized water and condition it in reference elec-
trolyte solution for at least 1 hour. Then recalibrate the electrode.
Contamination
Cleaning procedure
Fat and oil
Rinse with water containing household wash-
ing-up liquid
Lime and hydroxide deposits Rinse with citric acid (10 % by weight)
