9-10 Chapter 9: Inspection and Maintenance 42/24-10 EN Rev. 9
Limas11: Aluminum Sample Cell Cleaning
When should the
sample cell be
cleaned?
Sample cell contamination can result in unstable measurement values due to low
lamp intensity (see “Limas11 Problems”, page 10-20).
Status Messages When beam intensity becomes too low the appropriate status messages will be
displayed. For additional information see the “Status Messages” section,
page 10-13.
Quantity Description
For cleaning: Neutral detergent, deionized water, ethanol
For drying: Oil- and dust-free (instrument) air or nitrogen
1 Spray bottle
2 Plug to close off sample cell
Material Required
2 Pieces of FPM/ FKM tubing or PTFE pipe
Step Action
Preparation for sample cell removal:
Aluminum Sample Cell
Cleaning
(see Figure 9-6)
1
Turn off the sample gas supply to the analyzer module.
Turn off the gas analyzer power supply.
Open the wall housing door or the 19-inch housing cover. 2
The sample cell is hot (approx. 55 °C)!
Sample cell removal:
Loosen the sample gas tubing/pipe from the sample cell ports and
housing wall and pull them from the housing.
3
When removing the sample gas tubing/ pipe make sure no
fluids drip into the housing.
The sample gas tubing/ pipe removed should not be reused
since it is contaminated; follow the appropriate rules for
disposal.
4 Loosen 4 screws 1 (3-mm Allen screws) and remove 2 mounting
brackets 2.
5 Remove the sample cell from its housing.
Sample Cell Cleaning:
Wash the sample cell with a warm detergent/ water mixture. 6
Do not use other cleaners as they can damage the sample cell.
7 Thoroughly rinse the sample cell with deionized water and then with
ethanol.
8 Dry the sample cell with oil- and dust-free air (30-100 liters/hour).
9 Check that the contamination has been removed.
Also clean the sample gas line system.
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