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109117-1 Rev. A, 10/96
2.1 Calibrating a pH Electrode
1 point calibration
Place the tip of the electrode in the calibration buffer and
press It does not matter which buffer you do first.
The meter will automatically endpoint when the reading is stable
and the appropriate buffer symbol will appear on the display.
Rinse the tip of the electrode with distilled or deionized water and
goto Measuring Samples (Section 2.2) or 2 point calibration.
NOTE If you are using an ATC probe (or an electrode
incorporating ATC), temperature is being measured and
the buffer value is being corrected for temperature (see
Section 2.5). If you are not using an ATC in the system,
the Model 430 assumes a temperature of 25°C.
2 point calibration
Place the tip of the electrode in the second buffer and press
The meter will automatically endpoint when the reading is stable
and the appropriate buffer symbol will appear on the display. The
meter will also briefly display the electrode slope value.
Rinse the tip of the electrode with distilled or deionized water and
goto Measuring Samples (Section 2.2).
NOTE For maximum accuracy, we recommend using an ATC
probe or the 3-in-1 Combination electrode which includes
an ATC probe. If you do not have an ATC probe you
should make sure that all buffers and samples are at
25°C.
2
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