9
CALIBRATION
In order to obtain accurate measurements, frequent calibration is
recommended.
For better results, calibrate at a temperature close to that of the
solution to be tested (no more than ±3°C apart).
The instrument can be calibrated in 1 or 2 points. Two-point
calibration is always recommended for better accuracy.
The user can select the calibration stability criteria in Setup menu in
accordance with the application. “ACCU” - accurate is recommended.
Calibration points can be chosen among 1 ppm fluoride, 2 ppm , 10
ppm, 100 ppm and 1000 ppm.
PREPARATION
• The HANNA calibration solutions at 1 ppm (
HI 4010-11
), 2 ppm
(
HI 4010-12
) and 10 ppm (
HI 4010-10
) are already mixed with
TISAB II solution, while for 100 ppm (
HI 4010-02
) and 1000
ppm (
HI 4010-05
) it is necessary to prepare the calibration
solutions by mixing with TISAB II (
HI 4010-00
), 50% and 50%.
• Attach the fluoride and reference electrodes and the temperature
probe to their respective connectors on top of the meter.
• Switch the meter on by pressing the ON/OFF button.
Note
: For best results, it is recommended to prepare two beakers for
each calibration point: the first one to rinse the probes and the
second one to calibrate.
Note
: It is recommended to use clean plastic beakers.
CALIBRATION PROCEDURE
Note
: If the fluoride electrode is new, or it has not been used for a
few days, it must be soaked in a solution of
HI 4010-10
(10
ppm fluoride so TISAB) for at least 3 hours
for at least 3 hours
for at least 3 hours
for at least 3 hours
for at least 3 hours
prior to measurement.
prior to measurement.
prior to measurement.
prior to measurement.
prior to measurement.
• Rinse the electrodes with deionized water and dry them atten-
tively with a non-abrasive cloth.
• Submerse the fluoride and the reference elec-
trode as well as the temperature probe at least
1 cm (½”) in the calibration solution. Make sure
that the electrodes are not touching the bottom
of the beaker. Immerse the temperature probe
close to the tip of the other electrodes.
Note
: A gentle stirring is recommended.