- 12 -
(approximately 18ml), see Diagram-4, tighten the vial cap.
2) Before measuring, gently shake the sample vial to make sample
solution even and wait for air bubbles to disappear, see
Diagram-5, wait for 2~5 minutes until bubbles eliminate.
3) Wipe the sample vial surface with a microfiber cloth. Ensure that
the vial is dry, clean and free from smudges.
4) Apply 1 drop of silicone oil on the surface of the vial. Wipe with
a microfiber cloth to obtain an even distribution over the entire surface in order to eliminate scratches
and smudges and improve light scattering, see Section 4.1(c) for details.
5.3
Measurement Modes
a) Normal Measurement Mode
Press button, the display shows progress bar (see diagram-6). It will display measured value
after 8 seconds. Please press button again for repeated measurement.
b) Average Measurement Mode
Long press button, release it until you hear a beep, then the instrument enters average
reading mode. In this mode, the instrument will perform 10 times of continuous measurement,
displaying 1 data every 8 seconds, and will display the average value at the end, see diagram 6. The
average measurement mode can be used for observing the stabilizing process of turbidity, and can
also be used for testing rapid-settling solutions.
5.4
Notes for Measurement
a)
Keep the sample stable
: After the vial is placed into the sample cell, it is recommended to wait for
1 to 2 minutes before calibration, as the solution will experience some shaking when the vial moves,
which may affect measurement accuracy.
b)
Sample vial cleaning requirement
: Sample vials must be rigorously cleaned and free from
smudges or scratches. When wiping, user should grip the cap and bottom to avoid leaving
fingerprints on the surface of the vial. Its surface should be applied with a drop of silicone oil be wiped
with a micro-fiber cloth. After that, please clean with filter paper or high-quality tissue paper. See
section 4.1(c) for details.
c)
Mixing and Degassing
: Samples should not be vigorously shaken or vibrated. It is recommended
that users gently shake the sample vial to make solution evenly distributed. Air bubbles in solution
Diagram- 4
Diagram- 5
Diagram 6
