Hanna Instruments HI 96753 - Manual (Page 9)

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CALIBRATION PROCEDURE
Note: It is possible to interrupt calibration procedure at any time by pressing CAL CHECK or
ON/OFF keys.
Warning : Do not calibrate the instrument with standard solutions other than the HANNA CAL
CHECK TM Standards, otherwise erroneous results will be obtained.
• Turn the meter on by pressing ON/OFF.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
• Press and hold CAL CHECK for three
seconds to enter calibration mode . The
display will show “CAL” during
calibration procedure. The blinking
“ZERO”
asks for instrument zeroing.
• Place the CAL CHECK TM Standard
HI 96753-11 Cuvette A into the cuvette
holder and ensure that the notch on the
cap is positioned securely into the groove.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
• After a few seconds, the display will
show “-0.0-”. The meter is now zeroed
and ready for validation.
• Remove the cuvette.
• Place the CAL CHECK TM Standard
HI 96753-11 Cuvette B into the cuvette
holder and ensure that the notch on the
cap is positioned securely into the groove.
• Press CAL CHECK and the lamp, cuvette
and detector icons together with “CAL
CHECK” will appear on the display,
depending on the measurement phase.
• At the end of the measurement the display
will show the validation standard value.
The reading should be within specifications as reported in the CAL CHECK TM Standard
Certificate. If the value is found out of the specifications, please check that the cuvettes are free
of fingerprints, oil or dirt and repeat validation. If results are still found out of specifications,
then recalibrate the instrument.