Hanna Instruments HI 83414 User Manual

Page 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