Interferences
Opening the
combination
electrode
20
several seconds at high concentrations,
several minutes near the detection limit.
The measured value is stable if the value does not change by more than
0.1 mV within 30 seconds.
Interferences
Mercury
Protein
Aging
Please note that every electrode undergoes a natural aging process. The re-
sponse time increases and the slope decreases with the age of the electrode.
The following factors shorten the lifetime considerably:
Unsuitable storing conditions (see section S
Special measuring conditions (e.g. organic solutions, frequent measuring
with mercury or protein concentrations)
High temperatures
High changes in temperature
The warranty does not cover damage caused by measuring conditions and
mechanical damage.
Maintenance
Combination electrodes:
Refill any used up bridge electrolyte.
In the case of increased response times of the electrode perform the fol-
lowing activities:
– Polish the membrane surface using an SF/K polishing strip (see section
R
ECOMMENDED ACCESSORIES
deionized water, and with circular movements polish the membrane
surface for approx. 30 seconds.
– Then recondition the electrode (see section C
,
CALIBRATION
MEASUREMENT
Clean the inside of the combination electrode. To do so, open the
combination electrode as follows:
1
Unscrew the knurled nut from the connection head.
2
Position the connection cable upward in a straight line with the con-
nection head.
TORAGE
). To do so, moisten a polishing strip with
ONDITIONING
).
Ag/S 800
)
,
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