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Limas11: Safety Cell Cleaning,
9-20
continued
Step
Action
24
Hold the sample cell with 2 open-end wrenches (clamp 1 open-end
wrench in the vise, in order to fix the sample cell in position) and
screw in the beam guide tubes 10 and 11 as far as they will go.
Checking the Sample Cell for Tightness:
For the assembly of the sample cell as prescribed, a leakage rate of
–4
< 1 x 10
mbar l/s must be safely reached. This is tested as follows:
25
Seal the aperture of one sample gas tube so that it is gas-tight.
26
Connect the T-piece with shut-off valve to the aperture of the other
sample gas tube with the hose.
27
Connect the free end of the T-piece to the pressure gauge.
28
Blow air through the shut-off valve until the sample cell is under an
positive pressure of p
valve.
29
The pressure may not change significantly in 15 minutes at a constant
temperature. A sharp drop in pressure is an indication of a leak inside
the sample cell.
Installing the sample cell:
30
Push the purge gas hoses onto the connections of the sample cell and
secure by means of the clamping springs.
31
Check that the plugs 2 are seated on the sample gas tubing.
32
Insert the sample cell into the housing obliquely from above in such a
way that the sample gas tubes project through the leadthroughs to
the outside.
33
Slowly lower the sample cell initially onto the side pointing to the
beam splitter and then onto the side pointing to the measuring
detector and insert in the fixing device.
34
Clamp the purge gas hose 7 in the fixing device 8.
35
Attach 2 mounting brackets 6 and fasten by means of the 4 screws 5
(socket-head, wrench opening 3 mm).
36
Press the 2 plugs 2 into the leadthroughs. Fix the retaining board 3 in
position with the screw 4 .
37
If applicable, push the purge gas line onto the input of the flow sensor
(option) and fasten by means of the spring.
38
Lay the purge gas lines in the housing in such a way that no movable
parts, e.g. the chopper wheel, are obstructed, feed through the 2 cou-
plings 1 and fix in position.
Restarting the gas analyzer:
39
Close the system housing so that it is tight.
Light penetration during operation leads to erroneous measure-
ment values and overranging ("Intensity" status message).
40
Turn on the gas analyzer power supply.
41
Purge the sample gas feed path. With corrosive sample gases, purge
the entire sample gas line system with dry nitrogen.
42
Wait for the warm-up phase to end.
43
Check the zero point and end point and calibrate if necessary.
44
Start the sample gas and purge gas supply.
Chapter 9: Inspection and Maintenance
≈ 400 hPa (= 400 mbar). Close the shut-off
e
42/24-10 EN Rev. 9
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