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Rev. 1.0 31/01/2020
• By default, no calibration deadline is set; use the directional keys to select HOURS or DAYS and access
with key . Use the directional keys to change the number that appears in the centre of the
display, entering the hours or days that must elapse between two settings, and confirm with key .
• If a calibration deadline is set, the icon is shown on the display in measure mode.
• When the calibration deadline is activated, the instrument prevents further measurements.
The error icon and the icon representing the calibration deadline flash on the display.
The string “MAKE A NEW CAL” invites the user to perform a new calibration of the pH sensor to be
able to work again.
Press the key to start the calibration.
P2.8 Reset of the ORP parameter
If the instrument does not work properly or incorrect settings have been made, confirm YES with the key
to return all the parameters of the ORP menu to the default settings.
IMPORTANT: The factory reset of the parameters does not delete the stored data
P2.9 Temperature calibration
All the instruments in this series are pre-calibrated for a correct temperature reading. However, if a
difference between the measured and the real one is evident (usually due to a probe malfunction), it is
possible to perform an offset adjustment of +5 °C.
Use the keys and to correct the temperature offset value and confirm with .
• ORP automatic calibration
Automatic calibration with 475 mV solution
• In ORP measurement mode press the key to enter the calibration mode.
• The string “POINT ORP 475” appears on the display; the device requires 475 mV as calibration point.
• Rinse the electrode with distilled water and gently dab it with paper towel. Dip the electrode in the 475
mV Redox buffer solution.
• When the solution is recognized and the signal is stable, the red stripes are replaced by the stability
icon .
• Press the key as indicated by the string “PRESS OK”.
• The actual measured value flashes on the display and then the beaker icon appears at the bottom
left, indicating that the instrument is calibrated. The instrument automatically returns to measure
mode.
ATTENTION: Before proceeding with the sensor calibration operations, carefully consult the
safety data sheets of the substances involved:
• Redox Standard solutions.
• STORAGE solution for ORP electrodes.
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