6-4 | Model 933 UV Analyzer
Frequency Component/Task
Every Year * Filterblock Assembly
Replace the o-rings, Filter Cartridges, Membrane Filters, and
Flow Restrictors. Clean the interior surfaces to remove any
contaminants.
* In natural gas streams that are extremely dirty, the Flow
Restrictor in the rst lter stage (and possibly the second lter
stage) may need to be changed more often because it removes
most of the liquids and particulate from the gas.
See “Filterblock Maintenance” in this chapter.
Every 2 Years Column Block Assembly
Replace the Check Valves, Filter, Flow Restrictors, and o-rings.
Clean the interior surfaces of each section to remove contaminants.
The Column Assemblies need to be replaced only if they are
damaged due to liquids or severe contamination.
See “Column Block Maintenance” in this chapter.
Every 2 Years Chopper Assembly, Optical Bench
Replace the Chopper Motor Drive Belt (o-ring) and Chopper Wheel
Bearings. If there are recurring analyzer alarms that suggest
problems with the Chopper Wheel or other related parts in the
Chopper Assembly, replace these parts sooner (alarms: Warning
PMT Signal, Fault Wheel Speed, Warning Zero Drift, Warning
ALC, Warning Auto Setup).
See “Chopper Assembly Maintenance” in this chapter.
Other Flamepath Gap
During each analyzer maintenance, use a feeler gauge to check the
amepath gap of the following locations. The gap must not exceed
the listed gap for each location; if the gap exceeds this value,
contact AMETEK for advice. See “Examining and Caring For the
Flamepaths” in this chapter, for more information.
• Upper/Lower Enclosure anges (enclosure door and housing
joining surfaces).
Maximum Flamepath Gap:
0.1 mm (Group IIB)
0.04 mm (Group IIB+H2)
• Cover, Communications Port (Communications Port Body-Cover
joining surfaces)
Maximum Flamepath Gap: 0.1 mm (Group IIB)
0.04 mm (Group IIB+H2)
• Heated Column Block and Column Block Flange joining surfaces.
Maximum Flamepath Gap: 0.05 mm (Group IIB)
0.04 mm (Group IIB+H2)
For amepaths not mentioned here, contact AMETEK.
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