User Guide

9
• Immerse the fluoride and the reference elec-
trode as well as the temperature probe to a
depth of at least 1 cm (½”) in the prepared
buffer 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.
• Press CAL. The display will show “CAL” and “BUF” together with
an intermittent “~” symbol. The upper display will show the
calibration point (100 ppm) with the temperature of the solution
shown on the lower LCD.
• When the CON symbol appears, it means that the calibration
solution has been recognized and the reading has stabilized. Press
CFM to confirm the first calibration point.
Note: If the value of the calibration solution
measured by the meter is too far from
the ideal value, the “ “ symbol
starts blinking to indicate an error in
the calibration procedure. Ensure that the calibration solution is
fresh and the correct one (in this case 100 ppm), and that the
electrodes are in good working condition if necessary follow the
electrode maintenance procedure. Repeat the procedure with
fresh and/or new solutions and electrodes.
• After pressing CFM, the display will show
the second point of calibration (10.0 ppm).
Two-point calibration is always recom-
mended, however, by pressing CAL one
can exit the calibration procedure at this point, having successfully
completed a one-point calibration.
• Press BUF to toggle between 10.0 and 1000
ppm and select the second calibration buffer.
10
TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION
TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
((
((
(
only for technical personnel)only for technical personnel)
only for technical personnel)only for technical personnel)
only for technical personnel)
All the meters are factory calibrated for temperature.
The temperature probes are interchangeable and no temperature cali-
bration is needed when they are replaced.
If, for any reason, the temperature measurements seem inaccurate,
temperature recalibration may be carried out.
For an accurate recalibration however contact your dealer or the
nearest Hanna Customer Service Center.
PREPARATION
• Prepare a vessel containing ice and water and another one con-
taining hot water (at a temperature of around 50°C). Place
insulation material around the vessels to minimize temperature
changes.
• Connect the temperature probe (#1 on page 4) to the connector
on top of the instrument.
Note: If "°C" blinks, it means that the temperature probe is not
connected properly.
CALIBRATION PROCEDURE
• With the instrument turned off, press and hold CAL and then the
ON/OFF switch.
+
• Immerse the fluoride and the reference elec-
trode to a depth of at least 1 cm (½”) in the
second buffer solution. Make sure that the elec-
trodes are not touching the bottom of the
beaker. Immerse the temperature probe close
to the tip of the other electrodes.
• When the CON symbol appears, it means that the second calibra-
tion solution has also been recognized and the reading has
stabilized. Press CFM to confirm.
• Calibration is now complete and the meter automatically returns
to the normal operational mode.