Hanna-instruments HI 83414 Manual de usuario descargar pdf (Pagina 29)

OUT OF CAL RANGE FUNCTION

The instrument has a mechanism to prevent taking

measurements in a range where the calibration

does not assure the best results. The message

“Out of Calibration Range” is displayed on the

message line in the following situations:

• When the first calibration point is over 0.15 NTU and the reading is under 10 NTU.

• When two point calibration was performed and the reading value is over 40 NTU.

• When a three point calibration was performed and the reading is over 150% of the the third point value.

• When a four point calibration was performed and the reading is over 200% of the the fourth point value.

To take colorimetric measurements follow next

steps:

• Turn the instrument on by pressing ON/OFF.

• Be sure that the correct range is selected

(displayed on the down-right side of the LCD).

Only the Zero key is available, indicating that

a zero measurement should be done.

ZEROING THE INSTRUMENT

• Fill a clean, dry cuvette with 10 mL of sample,

up to the mark, taking care to handle the cuvette

by the top.

• Replace the cap.

• Wipe the cuvette thoroughly with a lint-free

cloth to remove any fingerprints, dirt or water

spots.

MEASUREMENT PROCEDURE FOR FREE/TOTAL CHLORINE

When taking Free or Total Chlorine measurements, several basic rules should be followed:

• Never use cuvettes with scratches or cracks because they can cause inaccurate readings.

• Always cap the cuvettes to avoid spillage of the sample into the instrument.

• Always close the lid of the instrument during measurement.

• If is possible use the same cuvette for zero and sample reading.

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Hanna-instruments HI 83414 Manual de usuario Pagina 29