4. Rinse a clean tube (0290) three
times with the blank.
Below 1 NTU – The meter should be
blanked with a 0 NTU Primary
Standard or prepared low turbidity
(<0.1 NTU) water. For the most
accurate results, use the same tube
for the blank and the sample.
5. Fill the tube to the fill line with the
blank. Pour the blank down the
inside of the tube to avoid creating
bubbles. Cap the tube.
6. Dry the tube with a lint-free cloth. Put
on a dry positioning ring. Cap the
tube. Wipe the tube thoroughly
again with a lint-free cloth.
7. Open the meter lid. Insert the tube
into the chamber. Align the index
notch on the positioning ring with
the index arrow on the meter. Close
the lid.
8. Press *IOK to select Scan Blank.
Remove the tube.
Turbidity (F)
* Scan Blank
16:02:19 01/04/05
44 CALIBRATION & ANALYSIS • TURBIDITY
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