LaMotte 2020i Turbidimeter - Manual (Page 18)

TUBE POSITIONING RING
The Tube Positioning Ring
To put a ring on a tube, remove the cap from the tube.
The tube positioning ring has two tapered notches and one
squared-off notch. Place the ring on the tube with the
squared-off notch closest to the top of the tube and tapered
notches closer to the bottom of the tube. Align the single,
squared-off notch with the vertical, white indexing line that is
printed on the tube. Place the tube flat on a hard surface and
firmly press the ring onto the tube with equal pressure distributed
along the top of the ring.
To remove a ring, invert the uncapped tube on a soft surface,
such as a paper towel. Press down on the ring with equal
pressure distributed around the ring.
ANALYSIS & CALIBRATION
The default units are NTU and the default calibration curve is formazin. When (F) is
displayed in the upper right corner of the display, this indicates that the meter is in the
formazin mode. For the most accurate results, a user calibration should be performed.
The Attenuation calibration option should be used when samples are over 500 NTU.
The Japan Standard calibration mode should be used only with Japanese Polystyrene
Standards (0–100 NTU). To change the settings see the Set Up instructions (see page
8).
18 TUBE POSTIONING RING •ANALYSIS CALIBRATION
INDEXING
LINE
SQUARED-OFF
NOTCH