CHAPTER 5
PREVENTIVE MAINTENANCE
This chapter describes the periodic maintenance procedures that should be performed on
the Model 48C to ensure proper, uninterrupted operation. Certain components such as
the sample pump, solenoid valves, and IR source have a limited life and should be
checked on a regular calendar basis and replaced if necessary. Other operations, such as
cleaning the optics and checking the calibration of the pressure and temperature
transducers should also be performed on a regular basis. What follows is a check and/or
cleaning procedure for these elements. Replacement procedures for components found to
be defective by these checks are given in Chapter 7, “Servicing.”
SPARE PARTS
Table 5-1 lists the recommended spare parts.
Part Number
Description
7361 IR Source
7336 Capillary
4510 Fuse – T, 3A, 250V (115V)
14009 Fuse – T, 1.25A, 250V (220V)
8606 Pump Rebuild Kit (KNF)
8907 Pump Rebuild Kit (ASF)
7368 Solenoid
Table 5-1.
Recommended Spare Parts
CLEANING THE OPTICS
Best results are obtained when the optics are cleaned prior to calibration. The cleanliness
of the mirrors should be checked any time the AGC intensity is below 200,000 Hz, since
one cause of low output is light attenuation due to dirt on the mirrors.
To clean the mirrors, follow the procedure below:
5-1
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