Hanna-instruments HI 83414 Manual de usuario descargar pdf (Pagina 32)

• Turn the instrument on by toggling ON/OFF switch. When the main screen appears the instrument

is ready.

• Make sure that the correct range is selected free or total chlorine. If necessary, press RANGE to

select the correct range.

• Press the CAL CHECK key and a screen with

GLP information is displayed including the serial

number and the last calibration time.

• Press the Chk key to start the check procedure.

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.

Note:It is recommended to zero the meter before

each measurement.

CAL CHECK PROCEDURE FOR FREE/TOTAL CHLORINE

The HI 83414 free and total chlorine colorimeter has a powerful CAL CHECK function that allows the

user to check the instrument calibration against a NIST traceable standard before making a set of

measurements. With the same standard, the instrument could be re-calibrated, if necessary.

Note:Free and total chlorine must be calibrated separately. Calibration of one range will not

calibrate the other range.

VALIDATION PROCEDURE

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Hanna-instruments HI 83414 Manual de usuario Pagina 32