Service
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5 Service
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5.1 52BIR-paths, cleaning and replacing
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Fig. 34: IR-paths (3-1-1S)
• Unscrew and remove the tubes from the IR-paths.
• Remove the nuts (2) (Size 7); in doing this, the threaded rods (3) should
be held tight to prevent them from turning with the nut.
• To be able to remove the nut (2) from the maximum length IR-path (10),
remove the plate (4) by unscrewing the four screws (5).
• Take out the pre-amplifiers (6) together with the spacers (7).
• Clean the paths with a cleaning solvent, e.g., ethanol.
– With a three part path, such as (B) and (C), the windows can be cleaned on
the inside using a cotton swab.
• In case of a single part path, such as (A), the path is filled with ethanol and,
after a few minutes, oxygen is blown in, to clean and dry out the path.
Soiling, which can accumulate from the analysis of materials that contains a lot of
sulphur and moisture or hydrogen, can be very difficult to clean. In such cases, the
paths should be replaced.
– Before reassembling the paths, the threaded rods (3) should be screwed in
by hand, in order to ensure that they are firmly installed.
– Assembly of the paths follows in the reverse order.
• Reconnect the plugs (17) of the preamplifiers (6), in case they were
removed.
- Readjust the base lines.
See chapter Infrared power supply and chapter Infrared baseline adjustments
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