Section 5 Calibration; Calibration Notes - Hach PHC101 User Manual

1. Remove the protective tape from the reference junction. Refer to
2. Rinse the reference junction and glass bulb with deionized water. Blot dry with a lint-free cloth.
3. For faster stabilization, soak the probe for 3 or more minutes in the sample before use.
4. Make sure that the meter has the correct date and time settings. The service-life time stamp in
the probe comes from the date and time settings in the meter.
Note: Some meters automatically open the date and time settings when the meter starts for the first time, or
after battery replacement.
5. Connect the probe to the meter.
Figure 2 Remove the protective tape

Section 5 Calibration

The procedure that follows is applicable to meters that can connect to Intellical pH probes. Refer to
the applicable meter documentation for meter operation and probe-specific settings.

5.1 Calibration notes

Read the notes that follow before calibration:
• Use prepared pH buffer solutions or mix pH buffer powder pillows with deionized water for
calibration. Discard the prepared buffer solutions after each calibration.
• Use two or three buffer solutions for best results. Two buffer solutions are sufficient if the expected
sample pH is between the pH of the two buffer solutions. The sequence in which the pH buffer
solutions are used is not important. Use buffer solutions that are 2 or more pH units apart.
• For a one-point calibration, use a pH buffer near the expected sample pH.
• Use the default calibration options or change the options in the probe settings menu.
• Use the single display mode for calibration when more than one probe is connected to the meter (if
applicable).
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Figure 2.