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Manual Chemical Cleaning Procedure
Over time the windows in the flow-cell may foul, reducing the light level. For most applications the flow-
cell windows must be cleaned occasionally to insure adequate light through the sample. This is typically
handled automatically with the analyzer's auto-clean feature. However, the process can be performed
manually from the keypad by flushing the flow-cell and tubes with the cleaning solution, (dilute HCl) and
rezeroing the instrument.
Interrupt On-Line Mode:
If the instrument is in the ON-LINE mode, press the Main Menu key on the keypad. If a security code is
programmed, the following message will appear:
ENTER SECURITY CODE
Enter the current security code (default is 0) and the instrument will display the MAIN MENU.
Acid Flush:
Note: The Cleaning solution can cause permanent damage to eyes, skin and clothing. Take proper
precautions while handling. If the cleaning solution contacts eyes, skin or clothing, rinse
immediately and heavily with cold water. Note that the typical cleaning solution is ~3%
Hydrochloric Acid (HCl). This information is important for any subsequent treatment that may be
required.
On the instrument keypad, press [3] for CLEAN. The CLEAN MENU will be displayed:
Press [2] for MANUAL.
Press the [+] key to begin pumping the cleaning solution. Allow the pump to run for 30 seconds.
Press the [-] key to stop the pump. Allow the cleaning solution to stay in the flow-cell and tubes for
2 minutes, THEN PRESS Main Menu to exit.
Instrument Zeroing:
Zero the instrument using the MANUAL INSTRUMENT ZEROING PROCEDURE.
Following the zeroing procedure, note the Zero instability. If greater than 0.005, the flow-cell must be
disassembled and cleaned.
Returning to On-Line Mode:
From the MAIN MENU, press [1] for ON-LINE.
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