Xylem WTW Cu 800 DIN Mode D'emploi page 20

Aging
Opening the
combination
electrode
20
 Mercury and silver ions poison the membrane.
 The membrane is light sensitive concerning the potential setting.
 Interfering ions: no disturbances with the following conditions:
2+ - 2
(Cu ) x (Cl )
-6 3
< 1.6 x10 mol /l
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 media (e.g. organic solutions, solutions that contain
mercury or silver, frequent measuring with high concentrations of interfer-
ing ions)
 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.
3 Unscrew the connection head.
2+ -
(Cu ) x (Br )
3 -12
< 1.3 x10 mol
). To do so, moisten a polishing strip with
).
2 3+
(Fe )
3 3
/l < 0.1 (Cu
)
TORAGE
ONDITIONING
ba15357d04
Cu 800
2+
)
,
12/2021