Hanna-instruments HI 93414 Manual de usuario descargar pdf (Pagina 27)

MULTIPLE SAMPLES READ

• Place the second cuvette with the reacted

sample into the holder and ensure that the

mark on the glass is matched with the mark on

the instrument top.

• Hold READ/TIMER u for 3 seconds. The

display will show the hourglass blinking and

the countdown prior to measurement.

Alternatively wait for:

Free Chlorine Total Chlorine

1 minute or 2 minutes and 30 seconds

and then just press READ/TIMER u.

• In both cases blinking dashes will appear during

measurement.

• The instrument directly displays the concentration

in mg/L of free or total chlorine.

Note:It is recommended to make a zero before

each measurement.

Note:If the signal to noise ratio is too high, the

zero value will blink.

INTERFERENCES

The colorimetric measurements are affected by the following interfering agents:

• Bromine (positive error).

• Chlorine dioxide (positive error).

• Iodine (positive error).

• Oxidized Manganese and Chromium (positive error).

• Alkalinity above 250 mg/L CaCO

or acidity above 150 mg/L CaCO

will not reliably develop the

full amount of color or it may rapidly fade. To resolve this, neutralize the sample with diluted HCl

or NaOH.

• In case of water with hardness greater than 500 mg/L CaCO

, shake the sample for approximatively

2 minutes after adding the powder reagent.

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Hanna-instruments HI 93414 Manual de usuario Pagina 27