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Input Calibration
January 2009 UDA2182 Universal Dual Analyzer Product Manual 145
Step Action Screen
12
Once the reading is stable
Press
Enter
“Buffer 2 stability check”
Use
to change the value of
the Buffer.
“Up/Down changes Buffer”
13
If the calibration fails, an error
message will be displayed
across the bottom stripe of the
screen.
Make necessary adjustments
and re-calibrate.
Error Messages:
Buffer span too low
OFFSET UNDERRANGE
OFFSET OVERRANGE
Slope underrange
Slope overrange
Solution Unstable
Temp Too Low
Temp too High
See Table 12-2 for definitions
8.5.3 Buffering Method of Calibrating pH Electrodes
Recommended for most applications
This technique is recommended for best accuracy in most applications.
Materials
Materials required are:
• Two standard buffer reference solutions that are at least 2 pH apart from one another.
• A container for each, large enough to immerse the electrode to measuring depth.
• Distilled or de-ionized water to rinse the electrode.
Procedure
Make sure you have selected “PV Type –pH Glass, pH Durafet, or pH HPW ” in the
Inputs configuration - Table 6-5.
Refer to Section 6.4.1 –
General Rules for Editing.