10. Maintenance
Under normal operation, the transmitter needs no maintenance expect regular cleaning and
calibration of the electrode to ensure accurate and stable measurement and system operation.
10.1 Electrode
10.1.1 Free Cl
2
electrode
During the measurement, the gold electrode surface of free Cl
2
electrode is continuously
grinded and polished by ceramic beads. Thus, this provides a self-cleaning effect in itself.
However, under the continuous grinding, the gold electrode in the end will be damaged, and
the electrode will need to be replaced. The following illustrations show the assembly steps of
the electrode and sensor box. For disassembly, converse the steps to carry them out. If
measures low concentration of water sample in long period, the silver electrode surface may
become white. It is a normal phenomenon, and it does not affect the actual measurement.
When replacing the free Cl
2
electrode, loosen the lower electrode wiring of 6PIN terminal
block(
○
1
Brown thick wire and
○
2
Red thick wire) first, and then remove the rotary joint. It is
not necessary to loosen the screws of reducer/sensor box. Then, loosen the screws of bearing
housing, take out the whole electrode with bearing housing, take apart between pulley and
E-type buckle, and then take out the old electrode for replacement.
I3.After inserting, screw up
the bearing screws
E-type buckle
Socket set screw×2
Rotary joint set
Pulley
Bearing with housing
Free Cl
2
electrode
I1.Electrode and bearing
assembly drawing
I2. Insert the completion
of the electrode into
the sensor box
I4. Loosen the screws of
reducer/sensor box. Move the
reducer closer to the free Cl
2
electrode, and mount the timing
belt on two pulleys. Move the
reducer to adjust for suitable
tightness of the timing belt, and
then screw up the screws of
reducer/sensor box. Finally,
screw up the free Cl
2
wiring.
Timing belt
Reducer
Motor
Free Cl
2
electrode
67
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