Measuring with pH & ORP Probes 124
21.4.3. Clear pH (ORP) Calibration
1. Press CAL, to enter calibration mode.
2. CLR option is displayed for a few seconds.
3. Press CLR, to clear previous calibration.
4. Press Yes, to confirm deletion.
21.4.4. pH Calibration Messages & Warnings
Message & Description Recommended Action
“Invalid Slope”
The electrode slope is outside accepted slope
limit. Calibration can not be confirmed.
Verify the probe is in the
buffer selected and that the
buffer is fresh.
“Clean Electrode”
The offset, evaluated at first calibration point,
is outside the accepted window; or the slopes,
evaluated between calibration points, are
outside the accepted lower limit.
Calibration can be confirmed.
Clean the probe to improve
the pH electrode's response.
See 21.5 Conditioning &
Maintenance for details.
Repeat calibration after
cleaning.
“Wrong Old”
The slope evaluated based on a comparison
between new and old calibration points is
outside the accepted limits.
Clear calibration and
proceed with a new one.
“Temperature Error”
The temperature of the buffer solution is outside
accepted temperature solution interval.
Check buffer temperature
and repeat the
measurement.
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