horiba LAQUA F-71G, Инструкция по эксплуатации

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Chapter 3 Basic Operation
3.3 Calibration
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3.3
Calibration
3.3.1 pH calibration
Up to 5 points of pH calibration is possible.
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Repeatability check of calibration
After calibration is completed, immerse the electrode in
the standard solution of pH7 and press the ENTER key
to perform the repeatability check of calibration.
It is necessary to calibrate the standard solution of pH7
in NIST or USA of the standard solution setting. This
operation is valid only once after calibration.
●
Calibration with NIST standard solution
It is possible to calibrate pH2, pH4, pH7, pH9, and pH12
using NIST standard solutions.
In this manual, an example of 2 points calibration with
the standard solutions of pH7 and pH4, which are used
generally, is explained.
The calibration order is arbitrary. In this example, the
procedures of calibration of pH7 are explained, and fol-
lowed by ones of pH4, but you can perform calibration in
an order as you like.
1.
Prepare the pH electrode. Wash the pH electrode
with pure water (deionized), and wipe it off by filter
paper or tissue paper.
2.
Open the filler port of the internal solution. During
the calibration, the filler port should be kept open.
3.
Immerse the pH electrode in the standard solution
of pH7 to calibrate the first point.