Metek 933 - About the Source Lamps; Replacing the Source Lamps

6-22 | Model 933 UV Analyzer
About the Source Lamps
• Source Lamp 1 is closest to the Measuring Cell (Figure 6-2).
• 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 the outer envelope of the lamp are not necessarily concentric or
consistent from lamp to lamp.
• New source lamps must be aligned to ensure optimal operation of the
analyzer.
• This procedure is based on the standard Model 933, bench code 8.
Do not interchange the source lamps. Lamp 1 must be cadmium (Cd)
– P/N 300-2070. Lamp 2 must be copper (Cu) – P/N 300-8707.
Replacing the Source Lamps
“P/N “ refers to Part Number.
To replace Source Lamps (refer to Figure 6-2):
Hazardous Locations
Before proceeding, test the area around the analyzer for explosive
gases and proceed only when the area is found to be safe.
Do not remove the cover of the Explosion-Proof Digital Communica-
tions Port on the front of the Lower Enclosure, do not connect a serial
cable to the Communications Port, do not open the Upper/Lower En-
closures, and do not power up/down the analyzer or computer if there
is an explosive gas atmosphere present.
1. Connect a serial cable between the computer and the analyzer’s
Communications Port. Using the Configurator Software, change the
Flow Control setting to “Zero”. Click OK then Apply. Do not save the
changes to EEPROM.
2. If the analyzer uses Measured Pressure Compensations, change it to
Fixed mode so that a “Fault Sample Pres Lo” alarm does not occur.
Close the sample inlet valve. Backpurge the analyzer sample system
with Zero gas for 2–3 minutes.
!
WARNING
!
CAUTION

NOTE
Setup (tab)
Gas Calibration<<Flow
Control>>
Setup (tab)
Compensations