ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A 163
Preparing to remove the filter, interrupting measuring mode
1 Switch analyzer system to “Zero gas local”.
2 Wait until all FTIR measured values have dropped to zero.
3 Disconnect the sample gas line from the gas sampling probe and seal
the probe connection with a blind fitting.
4 Remove thermal insulating hood from the filter unit.
Removing the filter element
5 On the filter unit, turn the T-handle 1 anti-clockwise. The filter holder 6
with the filter 8 is then pulled over the detaching disk 3 and out of the
housing 10.
6 Rotate the bridge 2 until it can be pulled off the bridge holding device 9
through the elongated holes.
7 Pull out filter insert with bridge 2 and detaching disk 3.
8 Rotate the detaching disk 3 until it can be pulled off the hexagon bolts 5
through the elongated holes.
Never loosen or tighten the hexagon bolts 5. They are factory-set to en-
able the detaching disk 3 to be moved easily.
Cleaning or replacing filters
9 Either Clean filter 8: blow adherent dirt off the surface using com-
pressed air; allow the compressed air to act diagonal to the surface.
Or Replace filter 8:
1 Remove screw plug 4 with NW 22 flat spanner.
2 Undo hexagon screw 12 below the screw plug 4.
3 Remove filter.
4 Insert the new filter.
10 Replace seals 7 (O-rings from the accessories).
The O-rings must not be greased; grease would falsify the measured
values.
Fitting the filter insert
11 Refit filter insert: Carry out steps 5 to 8 in the reverse order.
Restoring measuring mode
12 Remove blind fitting from the gas sampling probe and re-connect the
sample gas line.
13 Perform seal integrity test (see page 145) on the gas sample probe,
including the sample gas line connection.
14 Fasten thermal insulating hood to the filter unit.
15 Restore sample gas feed.
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