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Colorimetric Determination
Hach Programs
1.
Touch
.
Hach Programs
Select program
(Low Range)
430 COD LR
or
(High
435 COD HR
Range/High Range Plus).
Touch
.
Start
5.
When the timer
beeps, place the sample
vial into the adapter.
Touch
.
Read
Results will appear in
mg/L COD.
OxygenCOD_None_Mid_RCD_Eng_Ody.fm
2.
Clean the outside of
the vials with a damp
towel followed by a dry
one to remove
fingerprints or other
marks.
6.
If using High Range
Plus COD Digestion
Reagent Vials, multiply
the result by 10.
Oxygen Demand, Chemical
3.
Install the 16-mm
adapter.
Note: See Section 2.6 in the
Instrument Manual for
installation details.
Place the blank into the
adapter.
Note: For most accurate
results with samples near
1,500 or 15,000 mg/L COD,
repeat the analysis with a
diluted sample.
Method 8000
Zero
4.
Touch
.
Zero
The display will show:
0 mg/L COD
Oxygen Demand, Chemical
Page 3 of 8
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