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Limas11: Safety Cell Cleaning,
Cleaning the Safety
Cell
42/24-10 EN Rev. 9
continued
CAUTION!
It is imperative that the following procedure is carried out step by step and
with the greatest of care. Otherwise there is a danger that the safety cell is
no longer absolutely tight after cleaning and therefore no longer performs its
function!
The following is to be noted in particular:
• The cell windows must not be damaged!
• The old O-ring seals must not be used again! After cleaning, new O-ring
seals must be used!
• After cleaning, the tightness of the sample cell must be tested for a leakage
–4
rate of < 1 x 10
mbar l/s!
Note: If necessary, the tightness of the sample cell can be tested for a lower
leakage rate by means of a He leakage test.
CAUTION!
Toxic, caustic or corrosive fluid may be contained in the sample cell! This
fluid can escape when the sample cell is opened. In consequence of this,
suitable measures for the collection and disposal of the fluid are to be taken
before removal of the sample cell!
Step
Action
Preparation for Sample Cell Removal:
1
Turn off the sample gas and purge gas supply to the analyzer
module!
2
Purge the sample gas feed path with dry nitrogen (flow approx. 60 l/h,
duration approx. 30 minutes).
3
Seal the sample gas inlet and outlet of the sample cell (sample gas
tubing) with one plug each, so that no fluid can escape during the
removal of the sample cell.
4
Switch off the gas analyzer power supply!
5
Open the wall housing door or the 19-inch housing cover.
6
The sample cell and the lamp or the radiation source are hot
(approx. 60 °C)! Allow the modules to cool (approx. 30 minutes).
Chapter 9: Inspection and Maintenance
Continued on next page
9-17
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