Maintenance - Burkert 8206 Manuel D'utilisation

5 MAINTENANCE

5.1 Replacement of the redox electrode (compact version)
Redox-electrodes have a limited service life, depending upon many para-
meters, such as the chemical composition of the handled fluid, tempera-
ture, pressure, etc.
The manufacturer's warranty does not cover the redox electrodes.
The electrode must be replaced if it shows visible damage (broken glass, fractures, etc.) or
if the message ERROR" is displayed at the end of calibration.
For replacement, proceed as follows:
1. Disconnect supply voltage and make sure that there is no pressure on
pipe or tank.
2. Remove the transmitter from the pipe or submersion assembly.
3. Unscrew the cover and open it slightly.
4. Pull out electrode connector from the electronic board.
5. Pull sensor assembly out of the enclosure.
6. Unscrew the electrode out of assembly with SW17 wrench.
7. Screw new electrode into assembly and tighten with SW17 wrench.
Reassemble in reverse order.
5.2 Storage and cleaning of the electrode
When not in operation, the electrode should be stored in a 3 molar potassium chloride so-
lution (223,6 g/l), providing a regenerative effect. Is there no such solution available, normal
tap water will also do for short measuring interruptions of max. 2 - 3 days.
The electrode must not be stored in distilled or deionisized water, which may be used for
rinsing purposes only!
Measuring inaccuracies may occur, if the platine band electrode is covered by solid matter
deposits or organic substances. Since the contamination depends on the application, there
is no general detergent available. The following detergents however can be recommended
for most application cases.
-Greasy or oily deposits must be removed with a tenside-containing agent.
-Chalky deposits and metal hydroxide layers require diluted hydrochloric acid (10 %).
-Sulphide-containing deposits (purification systems) are removed with a detergent mixture
of diluted hydrochloric acid (10 %) and saturated pepsin.
Observe safety regulations, when handling acid-containing solutions. Always rinse electrode
with deionisized water and leave for approx. 10 minutes in a 3 molar potassium chloride
solution or in tap water.
REDOX TRANSMITTER 8206
E-31-