User Guide

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SPECIFICATIONS

Range 0.0 to 10.0 mg/L

Resolution 0.1 mg/L

Accuracy ±0.1 mg/L ±4% of reading

Typical EMC ±0.1 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 93715A-0 First Reagent 4 drops (6 drops in seawater)

HI 93715B-0 Second Reagent 4 drops (10 drops in seawater)

REAGENT SETS

HI 93715-01 Reagents for 100 tests

HI 93715-03 Reagents for 300 tests

For other accessories see page 48.

MEASUREMENT PROCEDURE

Note: for sample preparation follow the IRRIGATION WATER (LR)

procedure at page 17.

• Select the program number corresponding to Ammonia LR on the

secondary LCD by pressing PROGRAM t and s.

• Fill the cuvet with 10 mL of unreacted sample, up

to the mark, 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.

Ammonia LR

AMMONIA LOW RANGE

Nitrate HR

• Remove the cuvet and add the content of one

packet of HI 93728 reagent.

• Replace the cap and imme-

diately shake

vigorously for

exactly 10 seconds by mov-

ing the cuvet up and down.

Continue to mix by invert-

ing the cuvet gently and

slowly for 50 seconds, while

taking care not to induce

air bubbles. A deposit re-

mains, but this does not

affect the measurement. Time and way

of shaking could sensitively affect the

measurement.

• Reinsert the cuvet into the instrument,

taking care not to shake it.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 4 minutes and 30 seconds

and press READ DIRECT. In both cases "SIP" will blink during mea-

surement.

• The instrument directly displays concentration in mg/L of nitrate-

nitrogen on the Liquid Crystal Display.

• To convert the reading to mg/L of nitrate (NO

–

), multiply by a

factor of 4.43.

INTERFERENCES

Interference may be caused by:

Ammonia and amines, as urea and primary aliphatic amines

Chloride above 100 ppm (negative interference)

Chlorine above 2 ppm (positive interference)

Copper

Iron(III) (positive interference)

Strong oxidizing and reducing substances

Sulfide (it must be absent)