Hach-Lange 2100Q and 2100Qis User Manual - Manual (Page 13)

• Remove sample cell and batteries from the instrument if the
instrument is stored for an extended time period (more than a month).
• Keep the sample compartment lid closed to prevent the entry of dust
and dirt.
Sample cells
• Always cap the sample cell to prevent spillage of the sample into the
instrument.
• Always use clean sample cells in good condition. Dirty, scratched or
damaged cells can cause inaccurate readings.
• Make sure that cold samples do not “fog” the sample cell.
• Store sample cells filled with distilled or deionized water and cap
tightly.
Measurement
• Measure samples immediately to prevent temperature changes and
settling. Before a measurement is taken, always make sure that the
sample is homogeneous throughout.
• Avoid sample dilution when possible.
• Avoid operation in direct sunlight.
Turbidity measurement procedure
Note: Before a measurement is taken, always make sure that the sample is
homogeneous throughout.
1. Collect a
representative sample
in a clean container. Fill
a sample cell to the line
(about 15 mL). Take
care to handle the
sample cell by the top.
Cap the cell. 2. Wipe the cell with a
soft, lint-free cloth to
remove water spots and
fingerprints. 3. Apply a thin film of
silicone oil. Wipe with a
soft cloth to obtain an
even film over the entire
surface (
Apply silicone
oil to a sample cell ).
4. Push the Power key
to turn the meter on.
Place the instrument on
a flat, sturdy surface.
Note: Do not hold the
instrument while
making measurements. 5. Gently invert and
then insert the sample
cell in the instrument
cell compartment so the
diamond or orientation
mark aligns with the
raised orientation mark
in front of the cell
compartment. Close the
lid. 6. Push Read. The
display shows
Stabilizing then the
turbidity in NTU (FNU).
The result is shown and
stored automatically.
Additional information is
available on the
manufacturer's website.
English 11