39
•
Press
Start
and the display will show the countdown prior to the measurement and the ”
Reaction
Time
” message. Alternatively, wait for 5 minutes and press
Zero
.
•
The instrument will perform a zero sequence and after a few seconds the display will show
“
-0.0-
”. Now the meter is zeroed and ready for measurement.
•
Remove the blank vial and place the sample vial into the holder and push it completely down.
•
Press
Read
. The instrument will perform the reading. The instrument displays the concentration in
mg/L of total nitrogen (N)
.
• Press
s
or
t
to convert the result in mg/L of ammonia (NH
3
) or mg/L of nitrate (NO
3
-).
The method detects all organic and inorganic forms of nitrogen present in the sample.
INTERFERENCES
Interference may be caused by:
Bromide (Br-) above 240 mg/L
Chloride (Cl-) above 3000 mg/L
Chromium (Cr
3+
) above 0.5 mg/L
Nitrogen, Total HR
