Hanna Instruments HI 98402 User Manual

Page 6

• Immerse the fluoride and reference electrodes at least 1 cm (½”)

in the second calibration solution. Make sure that the electrodes
are not touching the bottom of the beaker. Immerse the tempera-
ture probe close to the tip of the other electrodes.

• The CON symbol appears to indicate that the second calibration

solution has also been recognized and the reading is stable. Press
CFM to confirm.

• Calibration is now complete and the meter automatically returns

to the normal operational mode.

TEMPERATURE CALIBRATION

(for technical personnel only)

The meter is factory calibrated for temperature.
The HANNA instruments

temperature probes are interchangeable

and no temperature calibration 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
• To enter the temperature calibration mode, with the instrument

off, press and hold the CAL button, and then ON/OFF.

• The measured temperature is shown on the upper display.
• Immerse the temperature probe in a bath at 0.0°C.
• Press CAL.

CAL and BUF will appear on the display with the

" symbol blinking. The upper part of the display shows the

calibration point (0.0 °C).

• CON appears on the display to indicate that the value has been

recognized and the reading is stable. Press CFM to confirm.

Note: If the reading is too far from the

expected value (in this case 0.0°C),
the "

" symbol starts blinking to

warn the user.

Verify if the temperature of the bath is correct (for best results,
use a stirrer to agitate a solution of ice and water), and if the
probe is functioning properly.

• Press CAL and then press STD to visualize the second calibration

point (50.0 °C).

• Immerse the temperature probe in a bath at 50.0°C.
• CON appears to indicate that the value has been recognized and

the reading is stable. Press CFM to confirm.

• Switch the meter off and back on again

to return to normal measurement mode.