Hanna Instruments HI 98703 - Manual (Page 25)

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OUT CAL RANGE FUNCTION
The instrument has an
Out Cal Range function to prevent taking measurements in a range where the
calibration does not assure the best results. The range where the calibration assures correct
measurements is up to 40 NTU for two-point calibration and up to 150% of the third point value
for three-point calibration.
The display will show a blinking “
CAL” tag each time the measurements are taken outside the
calibration range.
CALIBRATION ERRORS
• If the read value during calibration is too far
from the set value, the instrument will show
“
-LO-” or “-HI-” error.
• If the calculated calibration coefficients are
outside a certain range, the “ CAL Err” message
is displayed.
CALIBRATION DELETION
HI 98703 is factory calibrated. It is possible to
restore factory calibration by deleting last performed
calibration.
To delete last calibration, follow the next steps:
• Enter the GLP feature by pressing
GLP ▲ . The
date of the last calibration will be displayed
on the LCD.
• Press READ to see the information related
to calibration. The last panel is the one with
delete calibration.
• Press SETUP/DEL to delete the current
calibration. After deletion the instrument will
automatically return to measurement mode.
• Close the lid and press READ . 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.
or