Maintenance and Troubleshooting | 6-7
Measuring Cell Maintenance
This procedure discusses a Standard Range Measuring Cell (40 cm or
smaller, Figure 6-3.1) and a Low Range/White Cell (81.2 cm, Figure 6-3.2).
See also Figure 6-2 to locate and identify parts. Other types of Measuring
Cells are discussed in Manual Supplements shipped with the analyzer.
Replace/clean parts in the Measuring Cell:
• Every year.
• Any time an unscheduled cleaning is performed.
• If the analyzer responds slowly to a Zero when the sample system is
free of restrictions.
• If evidence of contamination is present in the sample tubing.
“P/N” refers to Part Number.
To clean and replace parts in the Measuring Cell (see Figures 6-1, 6-2, and
6-3.1 or 6-3.2):
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
Setup (tab)
Gas Calibration<<Flow
Control>>
Setup (tab)
Compensations
NOTE
See Chapter 7 for
spare part ordering numbers.
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