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102
• Select
Oxygen Demand, Chemical LR
(COD) method following one of the
procedures described in the
Method
Selection section (see page 12).
• Place the COD vial adapter in the
cuvet holder and ensure that the
adapter is well fit inside.
• Place the blank vial into the holder and push it completely down.
•
Press the
Zero
key and the instrument will perform a zero sequence. If the zero sequence was
successfully done, the display will show “
-0.0-
”. Now the meter is zeroed and ready for measurement.
•
Remove the blank vial.
•
Place the sample vial into the holder and push it completely down.
• Press
Read
and the instrument will perform the reading.
• The instrument displays concentration in
mg/L of oxygen demand
.
INTERFERENCES
Interference may be caused by:
Chloride (Cl¯) above 2000 mg/L.
Samples with higher chloride concentration should be diluted.
COD LR