To take readings:
1.
Rinse the probe with deionized or
distilled water before use to remove any
impurities adhering to the probe body.
If the pH electrode has dehydrated, soak
it for 30 minutes in OAKTON electrode
storage solution or a 2M–4M KCl
solution.
2.
Press ON to switch on meter. The
MEAS annunciator appears on the top
center of the LCD. The ATC indicator
appears in the lower right hand corner
to indicate Automatic Temperature
Compensation (See page 19 to set
Manual Temperature Compensation).
See figure
3.
Dip the probe into the sample.
When dipping the probe into the sample,
the sensor or the glass bulb of the electrode
must be completely immersed into the
sample. Stir the probe gently in the sample
to create a homogenous sample.
4.
Allow time for the reading to stabilize.
Note the reading on the display.
5.
To toggle between pH and mV (or Rel
mV) readings, press the MODE key.
21
20
Taking Measurements
Be sure to remove the electrode soaker bottle or protective rubber cap on the
electrode before measurement.
pH
ATC
MEAS
C
A
A
5.3
Taking measurements with READY indicator selected on
If the READY indicator has been activated, the READY annunciator lights when
the reading is stable*. Switch the READY indicator on or off in Set up program
P4.1—see page 32 for directions.
*The READY indicator appears and the reading holds until the measured value exceeds the tolerance
(± 0.02 pH; ± 0.8 mV <400; ±1.2 mV >400). Then, the READY annunciator turns off.
Taking measurements with the auto endpoint feature selected on
NOTE: this feature is available on model pH 310 only.
When a reading is stable for more than 5 seconds, the auto endpoint feature will
automatically “hold” the reading. The “hold” indicator appears on the left side of
the display. Press the HOLD key to release the reading. Switch the Auto endpoint
feature on or off in Set up program P4.1—see page 32 for directions.
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