Hach Lange 2100AN, Инструкция по эксплуатации инструмента

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SECTION 2,
continued
19
2.3.2.1 Silicone Oil Procedure
2.3.3 Preparing Dilution Water
Dilution water may be required for indexing and matching sample cells, diluting
over-range samples, and/or preparing Formazin Standards. Collect at least
1000 mL of high quality water (e.g., distilled, demineralized, or deionized water).
Check the turbidity of the dilution water before use. The 2100AN may be used to
check the dilution water turbidity because the instrument is precalibrated
at the factory. If the turbidity is greater than 0.5 NTU, the water may be filtered
with a 0.2 micron filter using the Sample Filtration and Degassing Kit
(Cat. No. 43975-10) or the equivalent. Clean all glassware with 1:1 hydrochloric
acid and rinse several times with dilution water when measuring low range
turbidity samples. Cap the cells to prevent small airborne particles from
contaminating the glassware if it is not used immediately.
1.
Thoroughly clean and
rinse the sample cell.
Note: See Section 2.3.1.
2.
Apply a thin bead of
silicone oil from the top to
bottom of the cell--just
enough to coat the cell
with a thin layer of oil.
Note: See Section 2.3.2.
3.
Spread the oil
uniformly using the oiling
cloth provided. 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.
Note: Store the oiling cloth in
a plastic storage bag to keep
the cloth clean.