20
SPECIFICATIONS
Range
0.00 to 3.00 mg/L (as NH
3
-N)
Resolution
0.01 mg/L
Accuracy
±0.10 mg/L or ±5 % of reading @ 25 °C, whichever is greater
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
Q.ty/test
Q.ty/set
HI 93764A-0*
Reagent Vial
1 vial
25 vials
HI 93764-0
Nessler Reagent
4 drops
1 bottle
*
Reagent Vial identification:
A LR
, white label.
Note
: Store the unused vials in a cool and dark place.
REAGENT SET
HI 93764A-25
Reagents for 25 tests
For other accessories see page 68.
MEASUREMENT PROCEDURE
• Select the
Ammonia LR
method following one of the procedures described in the “Method Selection”
section (see page 15).
Ammonia LR
AMMONIA LOW RANGE
• Remove the cap from a Reagent Vial.
• Add exactly 5.0 mL of sample to the vial, while keeping the
vial at a 45-degree angle.
• Replace the cap and mix by inverting the vial a couple of
times. This is the blank.
• Place the vial into the holder and push it completely down.