Thermo Fisher Scientific CyberScan pH 300/310 - Manual (Page 19)

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4.3 Taking Measurements
Be sure to remove the electrode soaker bottle or
protective rubber cap on the electrode before
measurement.
To take readings:
1. Rinse the probe with de-ionized 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 electrode storage solution
or 2M – 4M KCl solution (sold separately).
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 indicator Automatic Temperature Compensation (see page 15 to set
Manual Temperature Compensation). See Figure 15.
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 homogeneous
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.
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 SETUP program P 4.1. See page 30 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 SETUP program P 4.1, see page
30 for instructions.
Figure 15 - Measurement mode