36
SECTION 3, continued
4. Apply a thin film of
silicone oil. Wipe with a
soft, lint-free cloth to
obtain an even film over
the entire surface.
Note: Applying a thin coat of
silicone oil will mask minor
imperfections and scratches
which may contribute to
turbidity or stray light. Use
silicone oil equivalent to
Hach Cat. No. 1269-36,
which has the same refractive
index as glass.
5. Wipe off the excess
so that only a thin coat of
oil is left.
Excess oil
may retain
dirt and contaminate
the instrument cell
compartment.
The cell should appear
nearly dry with little or
no visible oil.
Note: Soft, lint-free cloth
(velvet) works well for oiling.
Store the oiling cloth with the
sample cells and keep it free
of dirt. After a few
applications of oil, the cloth
will contain enough residual
oil that simply wiping the cell
with the oiled cloth will
provide a sufficient oil coat
on the sample cell.
Periodically, add a small
amount of oil to the sample
cell surface to replenish the
oil in the cloth.
6. Press: I/O.
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