Baker Hughes Panametrics Aurora H2O, User Manual

Page: 78 / 92

4. Make a visual inspection of the mirror surface, and record
any observations of gross contamination. If the mirror
appears to be clean, do not clean it. Instead, reinstall it
carefully into the system (go to step 12).
5. If the mirror is contaminated, the first step in cleaning it
is to use the air blower to blow away any particulate
matter on the mirror surface. Place the mirror on a flat
surface holding it from the sides with a pair of plastic
tipped tweezers and repeatedly puff the air blower to
force dry clean air onto the mirror surface (see Figure 82
on page 65).
6. Using a piece of lens tissue, wet a small area with a
very small amount of analytical grade acetone (barely
wetting the lens tissue). Typically, one drop of acetone
will suffice. Tilt the lens tissue so that the acetone drop is
absorbed by the lens paper along the length of the piece
(see Figure 83 on page 66 and Figure 89 below).
7. Place the wet lens tissue on top of the mirror and drag it
horizontally across the surface of the mirror, while holding
it on with a pair of plastic-tipped tweezers (see Figure 90
below). Ensure that minimal liquid residue or streaks are
left behind on the mirror surface.
8. Use the air blower to blow dry air onto the surface
of the mirror while holding it with the tweezers. Puff
repeatedly until the mirror surface appears dry
(see Figure 85 on page 66).
9. Repeat steps 6-8 above at least three times, using
a new lens tissue each time. Each lens tissue wetted
with acetone is used only once to clean off any visible
residue on the mirror surface.
10. Visually inspect the mirror, and record any observation
of residual contamination.
11. If the mirror does not appear clean after repeated
cleaning, contact Panametrics Technical Support for
further assistance.
12. If the mirror does appear to be clean, replace it into
the mirror end cap, taking care not to disturb the
two O-rings in the assembly (see Figure 91 below),
prepare to re-install the mirror end cap assembly
into the optical absorption cell.
13. Using tweezers, insert the mirror into the hole on top of
the shim, with the gold-plated side facing up. Thread
the end cap into the bottom of the absorption cell tube.
Secure the threaded end cap in place with a 5/8” socket
wrench (see Figure 92 below).
14. Re-establish power to the Aurora H2O analyzer.
15. Re-establish the flow through the sample system.
16. If the
Aurora H2O still indicates a check mirror fault after
normal start-up, contact Panametrics Technical Support
for further assistance.
Figure 90: Cleaning a contaminated mirror
Figure 91: Replacing cleaned mirror
into end cap assembly
Figure 92: Replacing mirror end cap assembly into the absorption cell
Figure 89: Applying acetone to
lens tissue
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