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• 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
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