Aging; Maintenance - Xylem WTW CN 500 DIN Instrucciones De Operación

CN 500 / CN 800
Opening the
combination
electrode
ba15356e03 03/2015

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 measure-
ment 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

 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.
4 Push the connection head and pressure spring over the connection
cable.
5 Push the inner body out of the shaft.
NOTE
Never pull the connection cable of the electrode.
The cable might be damaged.
TORAGE
). To do so, moisten a polishing strip with
ONDITIONING
).
Aging
)
,
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