Hach-Lange 2100Q and 2100Qis User Manual - Manual (Page 20)

1. Fill the clean sample
cell to the line with high
quality water (<
0.5 NTU) and cap
immediately. Let the
sample cell degas for at
least five minutes. 2. Wipe with lint-free
cloth. Apply a thin film
of silicone oil (
Apply
silicone oil to a sample
cell
).
3. 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. 4. Insert the sample
cell in the instrument
cell compartment so the
diamond or orientation
mark always aligns with
the raised orientation
mark in front of the cell
compartment. Close the
lid. 5. Push the UP and
DOWN key to access
the Reading Options
and then select
Indexing Sample Cell.
Note: The instruments
always stays in the last
selected reading mode. 6. Push Read. The
display shows
Stabilizing then the
turbidity in NTU. Record
the cell position in the
cell compartment and
the reading result.
7. Remove the cell,
rotate it slightly
approximately ⅛ of a
turn and insert it again
into the cell
compartment. Close the
lid. 8. Push Read. Record
the cell position in the
cell compartment and
the reading result. 9. Repeat step 6 until
the lowest reading is
shown. Place an
orientation mark on the
cell marking band near
the top of the cell so the
cell can be consistently
inserted in the position
that yields the lowest
reading.
18 English