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Preventive Maintenance
Fan Filter Inspection and Cleaning
Fan Filter Inspection
Use the following procedure to inspect and clean the fan filter
(Figure
5-1).
and Cleaning
1. Remove the two fan guards from the fans and remove the filters.
2. Flush the filter with warm water and let dry (a clean, oil-free purge will
help the drying process) or blow the filter clean with compressed air.
3. Re-install the filter and fan guards.
Mounting Screws (4)
Filter
Fan Guard
Figure 5-1. Inspecting and Cleaning the Fan Filter
Photometer Cleaning
Best results are obtained when the photometer is cleaned prior to
recalibration. The cleanliness of the photometer should also be checked any
time the detector frequency drops below 65 kHz, since one source of low
output is light attenuation due to dirt in the cell. Dirt particulates are
usually effective ozone removers.
Use the following procedure to clean the photometer
(Figure
7-12).
CAUTION Some internal components can be damaged by small amounts of
static electricity. A properly grounded antistatic wrist strap must be worn
while handling any internal component. For more information about
appropriate safety precautions, see the "Servicing" chapter.
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect the plumbing and electrical connections.
Thermo Fisher Scientific
Model 146i Instruction Manual
5-3
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Troubleshooting
