Hach AV9000 Manual Del Usuario página 13

Table 2 Acceptable and unacceptable cleaning solutions
Acceptable
Dish detergent and water
Window cleaner
Isopropyl alcohol
Dilute acids
To clean the sensor:
1. Soak the sensor in soapy water.
2. Remove the screws from the protective cover
3. Remove the cover and gasket
4. Carefully swirl the sensor in an appropriate cleaning solution to remove soil. Use a spray or
squeeze bottle to wash away heavier deposits.
5. Clean the gasket and cover.
6. Attach the gasket and cover. tighten the screws until the gasket starts to compress.
Figure 8 Sensor protective cover and gasket
Replace the sensor desiccant
The desiccant canister contains beads of silica gel that keep the reference air tube free from
moisture. When the beads are blue, they remove moisture from the air. If the beads are pink, the
beads cannot absorb additional moisture. Replace pink beads immediately to prevent permanent
damage to the sensor.
Note: When the beads just begin to turn pink, it may be possible to rejuvenate them by heating. Remove the beads
from the canister and heat them at 100-180 ºC (212-350 ºF) until they turn blue. Do not heat the canister. If the
beads do not turn blue, they must be replaced with new desiccant. The desiccant container does not need to be
removed from the desiccant box to install new desiccant.
Do not use
Concentrated bleach
Kerosene
Gasoline
Aromatic hydrocarbons
(Figure
(Figure 8).
8).
English 13