LaMotte 2020i Turbidimeter - Manual (Page 26)

8. Rinse a clean tube (0290), or the
same tube, three times with the
standard. Avoid spilling standard on
the outside of the tube.
IMPORTANT: While the tube is
inverted, wipe the lip of the tube to
remove droplets of liquid that may
be present. This will prevent liquid
from being trapped under the ring
when the tube is returned to an
upright position.
9. Fill the tube to the fill line with the
standard. Pour the standard down
the inside of the tube to avoid
creating bubbles. Cap the tube.
10. Wipe the tube thoroughly again with
a lint-free cloth.
11. 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.
26 ANALYSIS & CALIBRATION