Hach DR/700 Procedures Manual page 393

HARDNESS,
10.
Place the blank
in the cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a 10-
mL cell. If the
10-mL cell is used for
the blank, another
10-mL cell must be used
for the sample.
13.
Press: READ
The display will count
down to 0. Then the
display will show the
results in mg/L
magnesium as CaCO
Note: To convert the
results to mg/L Mg,
multiply the result by
0.243.
continued
11.
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.
14.
Press the
key once
PROGRAM
and the
UP ARROW
key until the lower
display shows
program number
. 52.09.1
3
for calcium as
CaCO .
3
Note: Do not remove
sample cell.
52-67
12.
Place the
prepared sample in the
cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a
10-mL cell. If the 10-mL
cell is used for the blank,
another 10-mL cell must
be used for the sample.
15.
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.