Hach BL9000 Bedienungsanleitung Seite 15

At step 5 of Figure 10, 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
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 10 Replace the desiccant
Replace the hydrophobic filter
Replace the hydrophobic filter when:
• Unexpected increases or decreases in level trends occur.
• Level data is missing or incorrect.
• The bubble pressure is low.
• There is a low pressure error.
Refer to the illustrated steps that follow to replace the filter. At step 4, make sure that the following
occurs:
• The smooth side of the hydrophobic filter is against the inner surface of the desiccant container.
• The hydrophobic filter bends up and goes fully into the thread until it is not seen.
• The hydrophobic filter turns with the nipple when the nipple in the desiccant container turns. If the
filter does not turn, it has damage. Start the procedure again with a new filter.
For the best performance, make sure to install the desiccant container vertically with the end cap
pointed down. Refer to
Mounting on page 6.
Mounting on page 6.
English 15