AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 299
Sample cell cleaning:
7 Clean the sample cell with a warm detergent/water mixture.
Acids, alkalis or solvents can be used as cleansers in case of severe con-
tamination.
Be sure to follow the appropriate instructions for use and disposal when
using acids, alkalis or solvents.
Do not use hydrofluoric acid (HF) as it can destroy the sample cell.
8 Rinse the cell very thoroughly with deionized water until the detergent is
completely removed. Finally, rinse the cell with ethanol until all water is
removed.
9 Dry the sample cell with oil- and dust-free air (30 to 100 l/h.).
10 Check that the contamination has been removed.
Also clean the elbow fittings and the entire sample gas line system.
Sample cell installation:
11 Place new FFKM75 O-rings 7 on the sample cell connection ports.
12 Place the internal parts 8 of the elbow/pivot fittings on the ports and
tighten them by hand. Place the elbows 9 on the internal parts with their
ports facing toward the housing back wall and secure them by
hand-tightening the nuts 10.
The threaded connections must never be tightened any more than
hand-tight. Otherwise the connections may not be securely sealed.
13 Place the sample cell 6 in its holder with the gas ports pointing to the
left housing wall (as seen from the front/above).
14 Install 2 mounting brackets 4 – making sure that the notches for the
sample cell gas lines also face the left wall – and secure with 4 screws 3.
Connect the sample gas lines to the sample cell:
15 Push the sample gas tubes 2 through fittings 1 on the housing back wall.
Make sure the sample gas lines are smooth and straight on both ends
and that there are no kinks.
16 Slide nuts 13, cutting rings 12 and sealing rings 11 on the sample gas
pipes 2.
17 Slide the sample gas tubes 2 up to the stop in the elbow/pivot fittings 5
on the sample cell and hand-tighten nuts 13. Hand-tighten the nuts on
fittings
1 on the housing back wall.
The threaded connections must never be tightened any more than
hand-tight. Otherwise the connections may not be securely sealed.
18 Check the integrity of the analyzer module gas paths (see page 268).
Pay attention to higher seal integrity requirements!
Restarting the gas analyzer:
19 Close the system housing so that it is tight.
Light penetration during operation leads to erroneous measurement
values and overranging ("Intensity" status message).
20 Turn on the gas analyzer power supply.
21 Wait for the warm-up phase to end. Turn on the sample gas supply.
22 Check linearity.
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