AO2000
CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
303
ATTENTION
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 leak-
age rate of < 1 x 10
−
4
mbar l/s.
Note: If necessary, the tightness of the sample cell can be tested for a lower
leakage rate by means of a Helium leakage test.
ATTENTION
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!
Cleaning the safety cell
ATTENTION
The sample cell and the lamp or the radiation source are hot (approx.
60 °C)! Allow the modules to cool down after switching off the power
supply (approx. 30 minutes).
Preparation for sample cell removal:
1
Turn off the sample gas and purge gas supply to the analyzer.
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 (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.
Sample cell removal:
6
Undo the 2 couplings
1
of the purge gas lines on the rear of the analyzer
module and pull the purge gas hoses into the interior of the device. Re-
move the purge gas hose
7
from the fixing device
8
.
7
If applicable, remove the purge gas hose from the inlet of the flow sen-
sor (option).
8
To open the leadthroughs of the sample gas tubing, undo the screw
4
(socket-head, wrench opening 3 mm) for securing the retaining board
3
,
remove the 2 plugs
2
from the leadthroughs and push towards the inte-
rior of the device on the sample gas tubing.
9
Loosen the 4 screws
5
(socket-head, wrench opening 3 mm) and remove
mounting brackets
6
.
10
Lift the sample cell
9
on the side pointing to the measuring detector and
pull out obliquely upwards from the housing towards the measuring
detector.
11
Remove the purge gas hoses from the connections of the sample cell.
