Hanna-instruments HI 93414 Manual de usuario descargar pdf (Pagina 31)

FOUR-POINT CALIBRATION

To perform a four-point calibration, continue the

procedure with the following steps:

• Remove the third standard cuvette.

• Place the 750 NTU standard cuvette (or the

fourth prepared formazin standard) into the

holder, with the cuvette mark aligned with the

sign on the instrument top.

• Close the lid and press READ/TIMER u. The

display will show blinking dashes and the icons

for cuvette, detectors and lamp will appear

during measurement.

• At the end of the measurement, the four-point

calibration is completed and the instrument

returns automatically to measurement mode.

OUT CAL RANGE FUNCTION

The instrument has an Out Cal Range function to

prevent taking measurements in a range where the

calibration do not assure the best results. The range

where the calibration assures correct measurements

is up to 40 NTU for a two-point calibration and up

to 150% of the third point value for a three-point

calibration.

The display will show a blinking “CAL” tag each

time the measurements are taken outside the

calibration range.

CALIBRATION ERROR MESSAGES

• If the value of the standard read during the

calibration is too far from the set value, the

instrument will display “-LO-” or “-HI-” error

messages. Check if the correct standard is used

or prepare a fresh standard, if formazine is

used, and repeat the reading of the standard.

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Hanna-instruments HI 93414 Manual de usuario Pagina 31