
110 8000 Operator’s Manual
5 Maintenance and Troubleshooting
4 Select each option and enter the appropriate parameters as necessary
based on tubing length, tubing diameter, and system dead volumes.
At the time set for the clean frequency (see “1 Clean Frequency”
above):
• the 8000 drive unit moves to the rinse chamber and lowers the
needles
• the peristaltic pump draws the cleaning solution into the needles and
sample lines for the length of time defined as the drawing media time
(see “2 Drawing Media Time” above)
• the valves close and the pump pushes the cleaning solution into the
return lines for the programmed push forward time (see “3 Push
Forward Time” above).
Table 2 8 Program Auto Clean Variables
Option Function
1 Clean Frequency Select option 1, Clean Frequency. Enter an interval of up to 99 minutes and press
ENTER. The cleaning begins at this time.
Note: Ensure the clean frequency is set earlier than the first sample time point.
2 Drawing Media Time Select option 2, Drawing Media Time. Enter an interval of up to 999 seconds to
control the length of time the cleaning solution is drawn from the rinse chamber
and press ENTER.
3 Push Forward Time Select option 3, Push Forward Time. Enter an interval of up to 999 seconds to
indicate the length of time the solution is moved through the return lines and press
ENTER.
Appropriate parameters for each of the above options depends on the
length and diameter of the tubing as well as the needle volume. Do not
allow the cleaning solution to reach the dissolution apparatus. Once the
pump reverses, the cleaning solution is expelled in the rinse chamber.
Ensure the length of time entered for the push forward time does not
push the cleaning solution far enough to reach the dissolution apparatus
or sample contamination can occur.
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