166 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Replacing filter in the compressed air main regulator (-J85)
Wearing parts
Wearing parts Item no. Replacements
Filter in the compressed air main controller 990048 Every 12 months
Replacing the filter element
The compressed air main regulator is pressurized (5.5 to 7 bar)!
Preparing to replace the filter, interrupting measuring mode
1 Switch analyzer system to Zero gas probe.
2 Wait until all 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 Shut off the instrument air at the connection lead (source in front of the
analyzer cabinet).
5 Wait until the pressure at the inlet has dropped (display on the com-
pressed air main regulator –J85).
Replacing the filter element
6 Slowly screw on the filter housing 1 to relieve the residual pressure in
the filter. If necessary, position a 22mm open-end wrench at the bottom
end of the filter housing.
7 Unscrew filter housing and remove.
8 Undo the black closing piece 3 by hand; at the same time, fix the upper
black cylinder 2 using your other hand.
9 Remove the used filter element and insert a new filter element.
10 Re-assemble the filter: carry out steps 6 to 8 in the reverse order. Screw
on the filter housing only hand-tight.
Restoring measuring mode
11 Restart the instrument air supply
12 Remove blind fitting from the gas sampling probe and re-connect the
sample gas line.
13 Restore sample gas feed.
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