Hanna-instruments HI 83214 Manual de usuario descargar pdf (Pagina 21)

• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for

measurement.

• Remove the vial.

• Remove the cap and add 4 drops of HI 93764-0 Nessler

Reagent.

• Replace the cap tightly and mix by inverting the vial a couple

of times. This is the sample.

• Place the vial into the holder and push it completely down.

• Press Timer and the display will show the countdown prior to the

measurement and the message “Reaction Time”. Alternatively, wait

for 3 minutes and 30 seconds and press Read. The instrument will

perform the reading.

• The instrument displays concentration in mg/L of ammonia nitrogen (NH

-N). Press s or t to

convert the result in mg/L ammonia (NH

INTERFERENCES

Interference may be caused by:

• Organic compounds like: chloramines, various aliphatic and aromatic amines, glycine or urea above 10 ppm.

To eliminate these interferences distillation is required.

• Organic compounds like: aldehydes, alcohols (e.g. ethanol) or acetone above 0.1 %.

To eliminate these interferences distillation is required.

• Sulfide: may cause turbidity.

Ammonia LR

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Hanna-instruments HI 83214 Manual de usuario Pagina 21