User Guide

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If you are performing a 1-point calibration, press the ▲ and ▼keys together to
return to measurement mode. If you are performing a two-point calibration,
proceed with the next step.
1. Use ▲ or ▼keys to select the next buffer value (pH 1.68, 4.01, 9.18, 10.01
and 12.45).
2. Make sure the electrode is in the correct buffer solution. Allow the electrode
time to stabilize.
3. Press ENTER. The instrument blinks with the un-calibrated pH value
corresponding to the mV output of your pH probe. If the value displayed
differs substantially from the buffer value, this indicates electrode drift.
Consider replacing your electrode.
4. Press ENTER to confirm the buffer value. The display blinks the calibrated
value twice and flashes “DONE”. Press ENTER again to return to
measurement mode.
NOTE: Buffer must be within ±1.0 pH of the value you are calibrating to, or Err1
will display. To clear the Err1 display and return to calibration mode, press the ▲
and ▼keys together.
NOTE: You can view the pH calibration points in the Setup program. See Section
9.6 for details.
The slope and offset are re-determined after each calibration.