23
SECTION 2, continued
2.3.1 Cleaning Sample Cells
Cells must be extremely clean and free from significant scratches. The
glass used to make cells is easily scratched – manufacturing cells free of
minor scratches and other imperfections is difficult. However, minor
imperfections are effectively masked by applying silicone oil as
outlined in Section 2.3.2.
Clean the inside and outside of the cells by washing with laboratory
detergent. Follow with multiple rinses of distilled or deionized water.
Allow cells to air dry. Handle cells only by the top to minimize dirt,
scratches and fingerprints in the light path.
2.3.2 Oiling the Sample Cell
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. This silicone oil has the same
refractive index as glass. When applied in a thin, uniform coat, the oil
fills in and masks minor scratches and other imperfections in the glass.
Apply the oil uniformly by wiping with a soft, lint-free cloth.
Avoid application of excess oil. Applying excess oil may retain
dirt and contaminate the instrument's cell compartment.
1. Thoroughly clean the
sample cell.
2. Apply a small bead
of silicone oil from the
top to the bottom of the
cell-- just enough to coat
the cell with a thin layer
of oil.
3. Using a soft, lint-free
cloth, spread the oil
uniformly, then wipe off
the excess so that only a
thin coat of oil is left.
The cell should appear
nearly dry with little or
no visible oil.
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