6-14 | Model 931S / Model 932S UV Analyzers
Source Lamp Replacement
The typical life span of the source lamps is approximately 9–12 months of
continuous operation. However, a source lamp can exhibit signs of degra-
dation after 5–6 months.
When Do Source Lamps Need to be Replaced?
Possible signs of degradation or indications of Source Lamp failures are:
• Unstable lamp voltage (check voltage levels on Optical Bench Data
tab).
• Unstable analyzer output under Zero gas conditions (“w: Excessive
zero drift” alarm is displayed on the Status tab).
• The “w: ALC out of range” alarm is displayed on the Status tab.
Figure 6-3.
Optical Bench Data
tab (Model 932S).
Figure 6-4.
HC Scode and
MC Scode alarm lists,
Status tab (Model 932S).
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