Hanna Instruments HI 120 - Manual (Page 13)

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Press NUM to change the temperature value with the numerical keys. The
“2nd” tag will blink. Press CLR if you want to delete digits of the
displayed value. The remaining digits will shift to right. Introduce the
desired value. If the value is out of temperature range, a long beep will
be heard. Press NUM to confirm the new value or CAL to escape without
changing the temperature.
mV/ORP MEASUREMENTS
Oxidation-reduction potential (REDOX) measurements provide the quantification
of the oxidizing or reducing power of the tested sample.
To correctly perform a redox measurement, the surface of the ORP electrode
must be clean and smooth.
• Press MODE or simply mV from the left keyboard to
enter mV range.
• Submerge the tip of the ORP electrode (4 cm/1½”)
into the sample to be tested and allow a few
seconds for the reading to stabilize.
• The instruments display the mV reading on the primary LCD and the
temperature on the secondary LCD.
• If the reading is out of range, the closest full-scale value will be
displayed blinking on the primary LCD.
RELATIVE mV MEASUREMENTS
To enter Relative mV mode, press MODE or simply RelmV from the left
keyboard. The relative mV reading will be displayed on the primary LCD and
the current temperature value on the secondary LCD.
Note: Press or from the left keypad to toggle between temperature
and absolute mV reading on the secondary LCD.