Hanna Instruments HI 96746 User Manual

Page 8

• Press ZERO/CFM and the lamp, cuvette

and detector icons will appear on the
display, depending on the measurement
phase.

• After a few seconds, the display will show

“-0.0-”

. The meter is now zeroed and

ready for measurement.

• Fill one graduated mixing cylinder up to

the 25 mL mark with sample.

• Add the content of one packet of

HI 93746-0

reagent, close the

cylinder and shake well for 30
seconds. This is the sample.

• Fill a cuvette with 10 mL of the sample

up to 1.5 cm below the rim and replace
the cap.

• Replace the cuvette into the cuvette holder

and ensure that the notch on the cap is
positioned securely into the groove.

• Press and hold READ/ /TIMER

for three

seconds.

The display will show the

countdown prior to measurement. The
beeper is playing a beep at the end of
countdown period.

Alternatively, wait for 30 seconds and
just press READ/ /TIMER.
In both cases, the lamp, cuvette and
detector icons will appear on the display,
depending on the measurement phase.

• At the end of measurement, the instrument

directly displays concentration in mg/L of
iron on the LCD.

VALIDATION PROCEDURE

Use the validation procedure to ensure that the instrument is properly calibrated.
Warning:

Do not validate the instrument with any standard solutions other than the HANNA CAL

CHECK

Standards, otherwise erroneous results will be obtained. For accurate validation, please

perform test at room temperature: 18 to 25°C (64.5 to 77.0°F)

•

Turn the meter on by pressing ON/OFF.

• When the beeper sounds briefly and the

LCD displays dashes, the meter is ready.

INTERFERENCES

Interference may be caused by:

• Place the cuvette into the cuvette holder

and ensure that the notch on the cap is
positioned securely into the groove.

Cadmium

above 4.0 mg/L

Chromiun

above 0.25 mg/L

Chromium

above 1.2 mg/L

Copper

above 0.6 mg/L

Manganese above 50.0 mg/L
Molybdenum above 4.0 mg/L
Nitrite ion above 0.8 mg/L
Cobalt

above 0.05 mg/L

Cyanide

above 2.8 mg/L

Mercury

above 0.4 mg/L

Nickel

above 1.0 mg/L

Sample pH should be between 3 and 4 to avoid developed color to fade or turbidity.