Hach DR/700 Procedures Manual page 179

BARIUM,
continued
10.
Within five
minutes after the five
minute development
time, place the blank
in the cell holder.
Note: In bright sunlight,
it may be necessary to
close the cell
compartment cover.
13.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L barium.
11.
Press:
ZERO
The display will
count down to 0.
Then the display will
show the
concentration of the
standard and the zero
prompt will turn off.
Note: This step adjusts
the DR/700 to the
calibration curve
previously entered.
45-7
12.
Place the
prepared sample in
the cell holder.
Note: In bright light
close the cell
compartment cover.