6-10 | Model 933S UV Analyzer
3. 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.
4. Change the Flow Control to ‘4’ (shut-in/shut-off). Click Apply (next to
Flow Control) and then click OK.
Bleed down the sample system to atmospheric pressure (check gauge).
Close the valve on the Vent Line (or cap the Vent outlet).
To avoid tearing the Membrane Filters in the Filterblock, always bleed
down the sample system pressure on the downstream (outlet) side of
the Filterblock. Pressure differentials of more than 210 KPA (30 PSI)
from the inlet side to the outlet side can tear the Filters and they will
have to be replaced.
5. Disconnect AC power to the analyzer and power down the computer
before performing maintenance on the analyzer.
6. Disconnect the Measuring Cell tubing.
7. Remove the Measuring Cell, either Standard Range (Figure 6-3.1) or
the optional Low Range/White Cell (Figure 6-3.2) from the Window
Housing/Cover, then disassemble and clean it:
After removing the Windows and/or Mirror/Window, place them on a
clean, lint-free cloth. For the Mirror/Window, place it Mirror side up.
a. Standard Range
Grasp the edge of the Window and carefully remove it. Remove
the o-ring.
Low Range
Remove the Aperture Plate from the Measuring Cell. Grasp the
edge of the Window/Mirror Combination and carefully remove it.
Remove both o-rings.
Setup (tab)Cell/Misc
NOTE
!
CAUTION
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