User Manual
26 27
Ammonia LR
SPECIFICATIONS
Range 0.00 to 3.00 mg/L
Resolution 0.01 mg/L
Accuracy ±0.04 mg/L ±4% of reading at 25 °C
Typical EMC ±0.01 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 420 nm
Method Adaptation of the
ASTM Manual of Water and Environmental Technology, D1426-92
,
Nessler method. The reaction between ammonia and reagents causes a yellow tint in
the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93700A-0 First Reagent 4 drops (6 drops for seawater)
HI 93700B-0 Second Reagent 4 drops (10 drops for seawater)
REAGENT SETS
HI 93700-01 Reagents for 100 tests
HI 93700-03 Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
• Select the
Ammonia LR
method using the procedure described in the
Method Selection
section (see page 12).
• Fill the cuvette with 10 mL of unreacted sample (up to the mark)
and replace the cap.
• Place the cuvette into the holder and close the lid.
• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
AMMONIA LOW RANGE
• Remove the cuvette.
• Add 4 drops of HI 93715A-0 First Reagent (6 drops for
seawater analysis). Replace the cap and mix the solution.
• Add 4 drops of HI 93715B-0 Second Reagent (10 drops for
seawater analysis). Replace the cap and mix the solution.
• Reinsert the cuvette 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. When the timer ends the meter will perform the
reading. The instrument displays the results in mg/L of ammonia
nitrogen (NH
3
-N).
• Press s or t to access the second level functions.
• Press the Chem Frm key to convert the result in mg/L of ammonia (NH
3
) and ammonium (NH
4
+
).
• Press s or t to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron, organic chloramines, sulfide, various
aliphatic and aromatic amines.
Ammonia MR
10 mL