Metek 920, Operator'S Manual With Essential Health And Safety Requirements

Page: 193 / 278

Maintenance and Troubleshooting
|
5-17
Replacing the Source Lamps
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.
For more lamp maintenance information, see the Model 9xx-Series
Analyzers “Lamp Maintenance Manual Supplement” included in the
analyzer Documentation Package.
When Do Source Lamps Need to be Replaced?
Indications of Source Lamp failures are:
• Unstable lamp voltage (check voltage levels on the SIG screen).
• Unstable analyzer output under Zero gas conditions (“ w Zero Drift ”
alarm is displayed on the HStatus screen).
• The “ w Lamp Control ” alarm is displayed on the MStatus screen).
About the Source Lamps
• Source Lamp 1 is the one closest to the Measuring Cell (Figure 5-2).
• The cathode of the Source Lamp must be centered on the optical axis
of the Beam Splitter for optimal operation of the analyzer. The cathode
and glass envelope are not necessarily concentric or consistent on each
lamp.
• New source lamps must be aligned to ensure optimal operation of the
analyzer.
• This procedure is based on the standard Model 92 Analyzer, Bench
Type Code “ 4”.
Do not interchange the source lamps. Note the type of lamp in each
socket before removing.

NOTE
!
CAUTION

(SIG) RUN

F6 1

1..6
(HStatus) RUN

F5 4

1..7
(MStatus) RUN

F5 5

1..7

See Chapter 6 for
spare part ordering numbers.

See F2 1 under “RUN /
CFG Mode – F2 Commands”
in Chapter 4 for Bench Type .