Maintenance Of The Do71 Sensor - YOKOGAWA DO72 Instruction Manual

6.3 Maintenance of the DO71 sensor

6.3.1 Routine inspection
Cleaning of Sensor (Oxygen exchange
cap) a visual inspection of the oxygen
exchange cap must be made whenever
the sensor is calibrated. Any dirt on the
oxygen end cap adversely affects your
measurements.
If the dirt is spread over the oxygen
exchange cap, dip the oxygen exchange
cap into clean water and gently wipe
the dirt off with a soft cloth or lint-free
paper. If the dirt does not come off
easily, apply a neutral detergent to the
oxygen exchange cap so it can be easi-
er to remove the dirt. Wash the oxygen
exchange cap with clean water.
Before every calibration, check that the
oxygen exchange cap is not loose. If it is
loose, retighten it.
Cleaning procedure:
2% H2O2, acidic agents (HCL, H2SO4)
max. 4 – 5 % cleaning agents containing
CLO2 at room temperature.
6.3.2 Exchange of a used OEC
When replacing an OEC please make
sure to screw the new cap tightly (Fig.
14) to the probe body, so the black
O-ring is no longer visible. If the OEC is
not screwed on tightly (Fig. 15) the probe
body might get damaged by entering
liquid.
Fig. 14: Oxygen exchange cap installed
properly
Fig. 15: O-ring visible - wrong OEC
installation
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