User Guide

22
• Remove the cuvet.
• Add 4 drops of the First reagent
(6 drops in case of seawater
analysis). Replace the cap and
mix the solution by inverting the
cuvet a couple of times.
• Add 4 drops of the Second reagent
(10 drops in case of seawater
analysis). Replace the cap and
mix the solution by inverting the
cuvet a couple of times.
• Reinsert the cuvet into the
instrument.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 3 minutes and 30 seconds
and press READ DIRECT. In both cases “SIP” will blink during
measurement.
• The instrument directly displays concentration in mg/L of ammonia
nitrogen (NH
3
-N) on the display.
• To convert the reading to mg/L of ammonia (NH
3
), multiply by a
factor of 1.21.
• To convert the reading to mg/L of ammonium (NH
4
+
), multiply by
a factor of 1.29.
INTERFERENCES
acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron,
organic chloramines, sulfide, various aliphatic and aromatic amines.
• Wait for a few seconds and the
display will show “-0.0-”. Now
the meter is zeroed and ready for
measurement.
Ammonia LR
31
SPECIFICATIONS
Range 0 to 300 mg/L
Resolution 5 mg/L
Accuracy ±10 mg/L ±8% of reading
Typical EMC ±5 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference fil-
ter @ 525 nm
Method Adaptation of the cadmium reduction method. The
reaction between nitrate-nitrogen and the reagent
causes an amber tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93728-0 Powder reagent 1 packet
REAGENT SETS
HI 93728-01 Reagents for 100 tests
HI 93728-03 Reagents for 300 tests
For other accessories see page 48.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the NUTRIENTS SOLUTION
(HR) procedure at page 19.
• Select the program number corresponding to Nitrate HR on
the secondary LCD by pressing PROGRAM t and s.
• Using the pipette, add to the cuvet 6 mL of sample, up to
half of its height, and replace the cap.
• Place the cuvet into the holder and
ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO and “SIP”
will blink on the dis-
play.
• Wait for a few seconds and the display
will show “-0.0-”. Now the meter is
zeroed and ready for measurement.
Nitrate HR
NITRATE HIGH RANGE