10
OPERA
TIONAL GUIDE
ELECTRODE CONDITION
The display is provided with a probe icon (unless the feature is disabled from setup) which indicates
the electrode status after calibration. The “condition” remains active for 12 hours (unless the
batteries are removed).
The electrode condition is evaluated only if the current calibration has two points.
5 bars: excellent condition
4 bars: very good condition
3 bars: good condition
2 bars: fair condition
1 bar: poor condition
1 bar blinking: very poor condition
With 1 bar it is recommended to clean the electrode and recalibrate. If there is still only 1 bar or
1 bar blinking replace the probe.
Sensor check
Setting the meter to pH‑mV range the user can check the sensor status at any time. The offset
value is the reading in pH 7.01 buffer (@ 25 °C/77 °F). If this reading is outside the range
±30 mV, the electrode is considered “very poor”. The slope value of the sensor is the difference
between readings in pH 7.01 and in pH 4.01 buffers. When the slope reaches the value of about
150 mV, the electrode is considered “very poor“. When “poor“ or “very poor“, it is recommended
to replace it with a new one.
Note: To ensure reliable readings, the electrode must be cleaned with cleaning solution and
then hydrated in storage solution for a minimum of 30 minutes before calibrating the probe.
