6-44 | Model 933S UV Analyzer
Replacing Parts in the Filterblock
Replace/clean parts in the Filterblock:
• Every year (see Note*).
* In natural gas streams that are extremely dirty, the Flow Restrictor
in the first filter stage (and possibly the second filter stage) may need
to be changed more often because it removes most of the liquids and
particulate from the gas.
Although disassembling the Filterblock to inspect the filters is pos-
sible, the o-rings and filters should be changed whenever there is any
doubt about the cleanliness or integrity of these parts.
“P/N “ refers to Part Number.
To clean and replace parts in the Filterblock (see Figure 6-12):
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 Com-
munications Port. Using the Configurator Software, change the Flow
Control to ‘3’ (zero). Click OK then Apply. Do not save the changes to
EEPROM.
2. If the analyzer uses Measured Pressure Compensation (optional),
change it to Fixed mode so that a “f: Sample gas pressure too low”
alarm does not occur. To do this, view the Cell/Misc Parameters dialog
box and enter a value in the Default Cell Pres (pressure compensa-
tion) field that is the same as, or approximately, the Measuring Cell
pressure. Refer to “Cell/Miscellaneous (Compensation) Parameters” in
Chapter 4.
Close the sample inlet valve. Backpurge the analyzer sample system
with Zero gas for 2–3 minutes.
!
WARNING
NOTE
NOTE
See Chapter 7 for
spare part ordering numbers.
Setup (tab)
Gas Calibration<<Flow
Control>>
Setup (tab)Cell/Misc
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