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OPERATIONAL GUIDE
INITIAL PREPARATION:
The meter is supplied with four 1.5V AA alkaline batteries. Remove the
battery cover on the back of the meter and insert the batteries while
paying attention to their polarity.
Attach the fluoride electrode (#3 on page
4), the reference electrode (#2) and the
temperature probe (#1) to their respec-
tive connectors on top of the meter.
Press ON/OFF to turn the meter on.
Note: The temperature probe can also be used on its own to measure
the temperature independently.
Note: If the temperature probe is not con-
nected, the lower display will
indicate 25.0°C with the “°C” sym-
bol blinking.
MEASUREMENT OF FLUORIDE ION CONCENTRATION
Note: Ensure the meter is calibrated prior to proceeding any further.
In order to obtain accurate results, calibrate the meter at a
temperature no more than ±3°C away from the sample to be
measured subsequently.
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 solution + TISAB) for at least 3 hours prior to
measurement.
• Pour about 10-20 mL of the sample in a clean beaker and add
the same quantity of HI 4010-00 (TISAB) solution to the beaker.
Mix the solution for a few minutes.
• Rinse the electrodes with deionized water and dry them attentively
with a non-abrasive cloth.
• Immerse the fluoride and the refer-
ence electrode as well as the
temperature probe to a depth of at
least 1 cm (½”) in the prepared
sample.
Make sure that the electrodes are not touching the bottom of the
beaker. Position the temperature probe close to the tip of the other
electrodes.
• Wait until the display stabilizes (about
10-15 minutes). The fluoride ion con-
centration and the temperature will be
displayed on the upper and lower dis-
plays, respectively.
Note: It is recommended to mix the sample during the measurement,
using a magnetic stirrer set at around 100 rpm.
Note: If the temperature probe is not connected, the meter will not
compensate for the temperature variance. In this case, accurate
fluoride measurements are only possible if the temperature of
the sample and the calibration solutions are close (no more
than ±3°C apart).
TEMPERATURE MEASUREMENT
The temperature can be measured independently from fluoride con-
centration.
• Immerse the temperature probe at least
1 cm (½”) in the prepared sample.
• Wait for the reading to stabilize. The
temperature of the solution will be shown
on the lower part of the display.
MAGNETIC STIRRER
HI 190M
POWER
SPEED
ON
OFF MAX