Ametek 931S

6-4 | Model 931S / Model 932S UV Analyzers
Frequency Component/Task
Every Year Measuring Cell
Replace the o-rings and Cell Windows and clean the interior
surfaces to remove any contaminants.
This schedule is a minimum requirement. If other conditions are
found to be present, as discussed in “Measuring Cell Maintenance,”
more frequent cleaning may be required.
Every 2 Years Chopper Assembly, Optical Bench – Model 932S Analyzers
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: “w: PMT
signal out of range”, “f: Filter wheel speed out of range,
“w: Excessive zero drift”, “w: ALC out of range”, “w: Bench
auto-setup problem).
See “Chopper Assembly Maintenance – Model 932S Analyzers
Only” 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.
• 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)
• Cell Heater Block and Cell Heater Block Lid joining surfaces.
Maximum Flamepath Gap: 0.1 mm (Group IIB)
0.04 mm (Group IIB+H2)
For amepaths not mentioned here, contact AMETEK.