Replacing The Filaments - Siemens Maxum II Service Manual

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Flame Ionization Detector
4.6 Filament Detector
4.6.1

Replacing the Filaments

1. Remove the two bolts in the bottom of the detector block.
2. Separate the detector body (bottom) and detector cap (top) to allow access to the filament
board.
3. Note location of each wire and disconnect from board. Wires are paired; Sense is White
and Blue, and Reference is Red and Black.
4. Remove the screw and both washers holding the board in place.
5. Carefully lift board out of Detector block.
6. Discard the board and O-rings. Do not attempt to reuse old O-rings.
7. Remove the two metal inserts. These CAN be reused.
8. Inspect the metal flow diverter inserts for damage.
9. Before installing new board, examine the mounting surface and the holes for the filaments
to verify there is no contamination or scratches on the machined surface. If there is
contamination on the surface, clean it using a lint free cloth and a cleaning solvent such as
acetone or hexane. If the surface is scratched it may be necessary to replace the complete
assembly.
Note
The elements on the board are exposed and are very delicate. Handle the board only by
its edges. Hands and tools must be clean.
10.Install the metal inserts in the detector block. These inserts should be installed with the
groove perpendicular to the tube holes in the block (so that air cannot flow in a straight path
between the holes).
11.Install the new O-rings in hole in the Detector Block. It is also possible to install the O-rings
on the filament board instead of in the hole. If installing the O-rings on the board, be careful
not to damage the element.
12.Install the Board into the Detector Block. When installing the board, exercise caution not
to damage the exposed elements.
13.Reinstall the Flat Washer, Lock Washer, and Button Head Hex Screw. Do not over tighten
the screw as this can damage the Board
14.Reconnect wiring to the board. Wiring MUST be connected to the same cells as before.
Verify all termination points.
Note
The color coding information for the wiring should be on the Detector Certification Label.
Also note that there are two wires of each color. For a specific cell it does not matter which
wire is connected to which lead as long as the color is correct.
15.Before installing cover back on the Detector Block, turn on carrier air to verify there are no
leaks between the Board and the Block. Turn off carrier after this check is complete.
16.Set the cover in place and reinstall the 4 screws and lockwashers that secure the cover to
the detector block.
50
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001

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