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SECTION 2, continued
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.
Note: Only a thin coat of oil on the sample cells is necessary. Avoid using
excessive amounts of oil.
2.3.3 Orienting Sample Cells
Note: When orienting and matching cells, it may be more efficient to use the
continuous reading mode. The instrument performs continuous readings if the
READ key is pressed and held. As long as the key is held, the lamp remains on
and the display is updated every 1.2 seconds. The instrument cannot be used in
continuous read mode if the Signal Averaging mode is on.
Precise measurements for very low turbidity samples require using a
single cell for all measurements or optically matching the cells. Using
one cell provides the best precision and repeatability. When one cell is
used, an orientation mark (other than the factory-placed diamond) can
be placed on the cell so it’s inserted into the instrument with the same
orientation each time.
2.3.3.1 Orienting a single cell
When using a single cell, make an index or orientation mark on the cell
as follows:
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