User Guide

28
• Remove the cuvet.
• Add 4 drops of the First reagent.
Replace the cap and mix the
solution by inverting the cuvet a
couple of times.
• Add 4 drops of the Second
reagent. 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.
x 4
• Wait for a few seconds and the
display will show “-0.0-”. Now
the meter is zeroed and ready for
measurement.
x 4
Ammonia HR
33
SPECIFICATIONS
Range 0.0 to 30.0 mg/L
Resolution 0.5 mg/L
Accuracy ±1.0 mg/L ±8% of reading
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 re-
agent 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 56.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the IRRIGATION WATER (LR)
procedure at page 19.
• Select the program number 4 “Nitrate LR” on the secondary
LCD by pressing PROGRAM M and L.
• Using the pipette, fill the cuvet with 6mL 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 display.
• Wait for a few seconds and the display will
show “-0.0-”. Now the meter is zeroed
and ready for measurement.
Nitrate LR
NITRATE LOW RANGE