Hanna Instruments HI 3220 - Manual (Page 24)

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The relative mV value calibration may be used to perform a single point
calibration with an ORP standard or remove the contribution of the reference
electrode to display mV equivalent to a SHE.
• Press CAL when the instrument is in RELATIVE mV measurement mode.
The relative mV value and the temperature values are displayed.
• Use the ARROW keys if you want to change the displayed relative mV value.
• Press ZERO function key if you want Rel mV reading to be zero (Relative
mV offset equals the mV reading).
• When the reading is stable in mV range and the Relative mV offset is inside
the offset window (±2000 mV), the Confirm function key is displayed.
• Press Confirm to confirm relative mV calibration. The instrument will
return to measurement mode.
• If the absolute mV reading is out of range or the Relative mV offset is out
of the offset window, “Wrong relative offset” message is displayed.
Change the input value or the Relative mV value to complete the calibra-
tion process.
Note: If a Rel mV offset calibration exists, CLR function key is displayed.
Press CLR if you want Rel mV offset to be 0.0 mV.
RELATIVE RELATIVE RELATIVE RELATIVE RELATIVE m m m m mV CALIBRATION V CALIBRATION V CALIBRATION V CALIBRATION V CALIBRATION