Preventive Maintenance
IR Source Replacement
Thermo Electron Corporation Model 48i Instruction Manual 5-3
IR Source
Replacement
The IR source control system has been designed to operate the wire wound
resistor IR source conservatively in order to increase its life. Nevertheless,
the IR source does have a finite life. Since the IR source is relatively
inexpensive and easily replaced, it is recommended that the IR source be
replaced after one year of continuous use. This will prevent loss of data due
to IR source failure. If an IR source is to be replaced on an as needed basis,
it should be replaced when:
• There is no light output
• After cleaning the optics, the IR light intensities remain below 100,000
Hz
It is not necessary to recalibrate the Model 48i after replacing the IR source
since the Model 48i is a ratio instrument, and replacing the IR source does
not affect the calibration.
Fan Filter Inspection
and Cleaning
Use the following procedure to inspect and clean the fan filter (Figure 5-1).
1. Remove the fan guard from the fan and remove the filter.
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 guard.
Figure 5-1. Inspecting and Cleaning the Fan
Fan Guard
Filter
Mounting Screws (4)
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