Hach DR/700 - Page 628

61-72
OXYGEN DEMAND, CHEMICAL, continued
7. 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.
8. Clean the outside
of the sample vial
with a towel.
Note: Wiping with a
damp towel, followed by
a dry one will remove
fingerprints or other
marks.
9. Place the sample
vial in the adapter
with the Hach logo
facing the front of the
instrument.
10. Press: READ
The display will count
down to 0. Then the
display will show the
results in mg/L COD.
0 to 15,000 mg/L Note:
When High Range Plus
COD Digestion Reagent
Vials are used, multiply
the displayed value by 10.
Note: For most accurate
results with samples near
1,500 mg/L COD or
15,000 mg/L COD,
repeat the analysis with a
diluted sample.