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
Содержание 933S
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Страница 187: ...Maintenance and Troubleshooting 6 11 Figure 6 2 Optical Bench Assembly with Standard Range Measuring Cell...
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Страница 191: ...Maintenance and Troubleshooting 6 15 Figure 6 3 2 Low Range White Cell 81 2 cm P N 100 1780 1A...
Страница 197: ...Maintenance and Troubleshooting 6 21 Figure 6 4 Column Block assembly...
Страница 229: ...Maintenance and Troubleshooting 6 53 Figure 6 14 Optical Bench Chopper Assembly Maintenance diagram 100 2313 1A...
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Страница 268: ...A 4 Model 933S UV Analyzer Sample Flow Diagram Plumbing Schematic North American Style WX 933NA 2...
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Страница 279: ...Appendix A Drawings A 15 Optical Bench Board P N 100 1662...
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Страница 285: ...Appendix A Drawings A 21 Inlet and Vent Flame Arrestor Locations Environmental Purge Option 100 1783 1A...
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