Hach DR/700 Procedures Manual page 744

SUSPENDED SOLIDS,
7.
Fill a 25-mL cell
to the 25-mL line
with tap or
demineralized water
(the blank).
Note: Remove gas
bubbles in the tap water
by swirling or tapping
the bottom of the cell on
a table top.
continued
8.
Place the blank in
the cell holder.
Note: Use 10-mL cells
for the blank and the
prepared sample in
bright sunlight. Close
the cell compartment
cover.
81-70
9.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.