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PROCESS pH CALIBRATION
The PCA320, PCA330 and PCA340 has the possibility to calibrate the pH probe without using buffers
and without dismount the probe. For doing this calibration, a reference pH-meter must be used. To
complete the process calibration, follow the steps:
• Pour a quantity of sample in a beaker. Use the sample of the measured liquid directly from the
drain port of the measuring cell (#12) by opening it’s valve (#11) to do this as described in the
Calibration Procedure chapter.
• Place the pH probe of the reference meter in the beaker and stir gently.
pH CALIBRATION (PCA320, PCA330, PCA340)
• Wait for readings to stabilize.
• Enter in “pH Menu”- “Cal. pH Probe” - “Process pH Cal.” and enter in the “Cal. Value” field the
reading from the reference pH meter.
• Press CFM key when the analyzer prompt for “Overwrite pH cal. ?”.
• The analyzer checks for readings stability (see One-point calibration) and when the value is stable
the message “Stable... press CFM” is displayed.
• Pressing CFM key will complete the process pH calibration.
Note: The calibration could be terminated at any time by pressing ESC. In this case the new
calibration is not saved and the old one remains effective.
SET DEFAULT CALIBRATION
When a new probe is connected or for any reason the current calibration is wrong and new
calibration can’t be performed, the default calibration values could be set. In this case the slope is set to
59.16 mV/pH and the offset is set to 0 mV.
To accomplish that, select “pH Menu” - “Cal. pH Probe” - “Set Default pH Cal.”
The analyzer will ask “Reset the pH cal. to default ?” and if CFM key is pressed will replace the existing
calibration coefficients with the default values.
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