Xylem MJK pHix Compact V3, Руководство пользователя

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pHix® Compact V3. NG (next generation)
EN 4.10 Version 2103
Buffer adjustment /Buffer adjustment details
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Buffer adjustment
In order to ensure a precise and stable pH measurement, pHix® Compact must
be buffer adjusted with regular intervals. Buffer adjustment is carried out in
practice by dipping pHix® Compact in solutions (buffers) with known pH values.
The calibration is made by using these known pH values as a reference points.
pHix® Compact is buffer adjusted using two buffers with pH values of 4.01 and
7.00 (acidic range) or pH values of 7.00 and 10.01 (alcalic range). For
measurements around pH 7 (neutral), both buffers can be used.
The sequence of different pH buffer solutions is not important. pHix® Compact
automatically detects which buffer is used for adjusting the point of origin, zero
points, and which buffer is used for adjusting the slope (the conversion
between the electrodes mV and the measured pH value).
The first reference point sets the correct zero point for the measurement curve,
and the second reference point sets the correct slope for the measurement
curve.
pHix® Compact is, as standard, delivered to use buffer values at 4, 7 and 10.
First buffer adjustment with pH 7 as
reference.
Second buffer adjustment with pH 4
as reference.
Buffer adjustment details
The buffer adjustment is the process that is done in order to get the main
characteristics of a pH electrode, those are slope and zero point.
The buffer adjustment is done as a 2 point adjustment. The pHix is dipped into
two different buffer solutions. This gives to points (mV, pH) that are converted