Model 80391 Sleep Fragmentation Chamber
3700 Sagamore Parkway North . Lafayette, IN 47904 USA . Phone: (765) 423-1505
2. Use as short of a cycle as possible. Exposure of 15 minutes at 15-17psi and 250
O
F is
recommended.
3. Do not stack cages in heights exceeding 30 inches.
4. Effective steam sterilization depends upon proper temperature controls and an adequate
steam supply. Alkaline corrosion inhibitors from boiler feed water may destroy plastic
materials or dull the cage surface layer
Drive Assembly Cover Removal and Sweep Arm Force
Adjustment
The sweep arm is set at the factory to slip when resisting force exceeds approximately 500
grams. This is set specifically for mice in order to avoid injury to the animal. However, higher
forces may be needed to disturb the sleep of larger animals, e.g. rats. The sweep arm slip
force may be increased or decreased by following this procedure. The drive assembly may
remain mounted to the stands, the chamber may remain under the drive assembly, and the
sweep arm may remain engaged to the drive assembly while cover removal and tension
adjustments are made.
1. Operate the unit in continuous mode and test the sweep arm force by applying an opposing
force by hand against the sweep arm until the drive slips and the sweep arm fails to move
in the direction it was traveling. Check sweep arm force in both drive directions.
2. Remove the Top/Side cover from the drive assembly by removing 5 screws from the left
side, 2 screws from the end, and 2 screws from the right side as shown below.
3. Sweep arm tension screws (2) are located on top of the roller nut block.
4. Turn both tension screws counter-clockwise to loosen screws which reduces sweep arm
drive force. Loosen both screws until very loose but do not remove the screws. Operate
the unit in continuous mode. If the screws are fully loose, the roller nut will fail to move
and the sweep arm will not move in either direction. Stop the unit.
5. Finger tighten both tension screws equally by turning clockwise by hand about 1/2 turn.
Operate the unit and apply an opposing force by hand against the sweep arm to test
sweep arm force. Stop the unit.
6. Again tighten both tension screws equally by 1/2 turn and operate the unit to test the
sweep arm force. Continue tightening both tension screws equally until the desired sweep
arm force is achieved.
7. If the sweep arm force is higher than desired, loosen both tension screws equally until
the desired force is achieved.
8. When desired sweep arm force is achieved, replace the Top/Side cover.
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