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109117-1 Rev. A, 10/96
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3.4 Problem Solving
Most problems are caused by electrode faults rather than by the
Model 430 but power fluctuations can corrupt calibration values
being held in the meter memory.
3.4.1 Meter Reset
To assure that the meter memory and calibration points have not
been corrupted by power fluctations, perform the meter reset and
buffer set per Section 2.3 of this manual.
Retry calibration of the meter and electrode. If calibration fails,
perform the meter test (Section 3.4.2).
3.4.2 Meter Test
1. Disconnect the power plug from the back of the meter.
2. Press and hold and reconnect the power plug.
The display first shows the test sequence, with all
segments showing, then display shows 1.
3. Release Press and the display shows 2.
4. Press and the display shows 3.
5. Press and the display shows 4.
6. Press and all segments will display for a second,
then the meter will return to normal
operation.
7. Disconnect the electrode from the meter and install the
shorting clip in the electrode socket. If the meter is
operating properly it will display a stable pH value
between 6.98 and 7.02 (or 0 ± 1 mV in the millivolt mode).
cal
mode
on/off
read
read
read
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