User Guide

24
Ammonia HR
• 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 cuvet.
• Add 4 drops of HI 93733A
Nessler Reagent. Replace the
cap and mix the solution.
• Reinsert the cuvet into the instrument.
• Press TIMER and the display will show the countdown prior to
measurement or, alternatively, wait for 3 minutes and 30 seconds
and then press READ DIRECT. In both cases the display will show
“SIP” during measurement.
• The instrument directly displays concentration in mg/L of Ammo-
nium ion (NH
4
+
) on the Liquid Crystal Display.
• To convert the reading to mg/L of ammonia (NH
3
), multiply by a
factor of 0.944.
• To convert the reading to ammonia nitrogen (NH
3
-N), multiply by
a factor of 0.776.
INTERFERENCES
Interference may be caused by:
acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron,
organic chloramines, sulfide, various aliphatic and aromatic amines.
x 4