29
•
Place the vial into the holder and
push it completely down.
•
Press ZERO and “SIP” will blink on the display.
•
Wait for a few seconds and the
display will show “-0.0-”. Now the
meter is zeroed and ready for
measurement.
•
Remove the vial.
•
Remove the cap and add the content
of one packet of HI 93701-0 Free
Chlorine Reagent.
•
Replace the cap and shake gently to
mix for about 20 seconds. This is the
reacted sample.
•
Place the vial into the holder and
push it completely down. Ensure that
the vial orientation respect to the
holder is the same as the blank.
• Wait for 1 minute and press READ DIRECT. "SIP" will blink during
measurement.
• The instrument directly displays concentration in
mg/L of free
chlorine
on the Liquid Crystal Display.
INTERFERENCES
A positive interference may be caused by:
Bromine (Br
2
)
Iodine (I
2
)
Chlorine, Free
52
COD MR
• Select the program number corresponding to Oxygen Demand,
Chemical MR (COD) on the secondary LCD by pressing PROGRAM
t
and
s
.
•
Place the blank vial into the holder
and push it completely down.
•
Press ZERO and "SIP" will blink on the display.
•
Wait for a few seconds and 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 DIRECT and "SIP" will blink during measurement.
• The instrument directly displays concentration in
mg/L of oxygen
demand
on the Liquid Crystal Display.
INTERFERENCES
Interference may be caused by:
Chlorides (Cl
-
): above 2000 mg/L.
Samples with higher chloride concentration should be
diluted.