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Limas11: Aluminum Sample Cell Cleaning
When should the
sample cell be
cleaned?
Status Messages
Material Required
Aluminum Sample Cell
Cleaning
(see Figure 9-6)
9-10
Sample cell contamination can result in unstable measurement values due to low
lamp intensity (see "Limas11 Problems", page 10-20).
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
2
Pieces of FPM/ FKM tubing or PTFE pipe
Step
Action
Preparation for sample cell removal:
1
Turn off the sample gas supply to the analyzer module.
Turn off the gas analyzer power supply.
2
Open the wall housing door or the 19-inch housing cover.
The sample cell is hot (approx. 55 °C)!
Sample cell removal:
3
Loosen the sample gas tubing/pipe from the sample cell ports and
housing wall and pull them from the housing.
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:
6
Wash the sample cell with a warm detergent / water mixture.
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.
Chapter 9: Inspection and Maintenance
Continued on next page
42/24-10 EN Rev. 9
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