Hach AV9000, User Manual

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Table 2 Acceptable and unacceptable cleaning solutions
Acceptable Do not use
Dish detergent and water Concentrated bleach
Window cleaner Kerosene
Isopropyl alcohol Gasoline
Dilute acids Aromatic hydrocarbons
Replace the desiccant
N O T I C E
Do not operate the sensor without desiccant beads or with green desiccant beads. Permanent damage to the
sensor can occur.
Immediately replace the desiccant when it changes to green. Refer to Figure 11 .
Note: It is not necessary to remove the desiccant container from the desiccant hub to install new desiccant.
At step 5 of Figure 11 , make sure that the O-ring is clean and has no dirt or debris. Examine the O-
ring for cracking, pits or sign of damage. Replace the O-ring if it has damage. Apply grease to dry or
new O-rings to make installation easier, to get a better seal and to increase the life of the O-ring.
For the best performance, make sure to install the desiccant container vertically with the end cap
pointed down. Refer to
Attach the desiccant hub on page 8.
Note: When the beads just begin to turn green, 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 orange. Do not heat the canister.
If the beads do not turn orange, they must be replaced with new desiccant.
Figure 11 Replace the desiccant
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