4 - 7
Figure 4-10, Water Jacket Drain and Hose Barb Insert
5. After water jacket has finished
draining, remove the hose barb
insert and secure on the front of the
unit. See Figure 4-10 and 4-11.
6. Install the plug into the drain on the
incubator
7. Install cover plate.
8. To fill the water jacket, see Section 1.5j. Be sure to add
the rust inhibitor to the water when filling. For the pro-
portions of rust inhibitor to water and the part number,
see Section 4.12.
4.9 Adding or Replenishing the Rust Inhibitor
Model 3010 incubators are shipped from the factory with a
rust inhibitor added to the water in the jacket. This inhibitor
must be replenished every 2 years. Mix 1 bag/bottle of the rust
inhibitor with a gallon of water in the resistance range from
50K to 1M Ohm/cm. Drain a gallon of water from the jacket
and replace it with the rust inhibitor mixture.
Note:
High purity water (1M to 18M ohm/cm resistivity) is a
very aggressive solvent and is considered slightly acidic. Ideal
pH for the water in the jacket is 7. Sodium hydroxide may be
used to change the pH of high purity water. It requires approxi-
mately 8ml of 0.05 normal sodium hydroxide per gallon of high
purity water to raise the pH to 7. The water jacket holds appox-
imately 12 gallons. Sodium hydroxide and the rust inhibitor
may be used in the same water jacket.
Rust Inhibitor (0.5 lb.) bag
1900100
Rust Inhibitor (800ml) bottle
1900101
(use in units with a cooling coil)
Sodium Hydroxide (0.05N)
130082
4.6 Replacing the Air Sample Filter
The air sample filter should be replaced as needed; every
6 months is recommended. On the inside of the chamber, insert-
ed into the back of the blower scroll, is the air sample filter and
its connecting tubing. Disengage the tubing from the back of
the scroll, then remove the filter from the tubing and discard.
Install the new filter. Connect it securely to the air sample filter
tubing, then insert the tubing into the back of the blower scroll.
4.7 Replacing the Access Port Filter
The access port filter should be replaced as needed; every
6 months is recommended. The filter is connected to the stop-
per in the upper left corner of the inside chamber back wall.
Remove the filter from the connecting tubing and discard.
Install the new filter.
4.8 Draining Water Jacket
1. Turn the unit off. Remove the plug from the power
source.
2. Remove the front cover plate below the door. There are
small flatblade screwdriver pry slots on each end of the
plate to help remove it. See Figure 4-9.
Figure 4-9, Front Cover Plate Below the Door
3. Remove the drain plug. Retain for use after draining is
complete.
4. Connect the hose barb insert to the drain on lower front
of the water jacket and to the drain hose.
Model 3010 Incubator __________________________________________________________________Maintenance
Figure 4-11
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