Lutron Electronics PH-222, Руководство пользователя

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4. pH CALIBRATION PROCEDURE
4-1 Calibration Considerations
pH electrodes rely on an mV signal in order to produce a pH reading. An ideal electrode
will produce a 0mV reading at pH 7.00. However, most electrodes will be slightly off this
until calibration is done. This is why calibration is an important step to ensure a high
degree of accuracy.
4-2 Required Equipment for Calibration
•
pH-222 Meter with electrode fitted
•
Buffer solutions:
o
pH 7.00 Buffer Solution (PH-07A, 50ml included)
o
pH 4.00 Buffer Solution (PH-04A, 50ml included)
o
Distilled Water for rinsing
4-3 Calibration Procedure
pH 7 Calibration
1) Decant an appropriate amount of distilled water into a small beaker (enough to
cover the electrode bulb).
2) Immerse the electrode and rinse it to remove any particulates from the sensor.
3) Power on the instrument by pressing the “POWER” Button (3 -2, Front Panel
Description).
4) Press the “HOLD” Button (3 -3, Front Panel Description) once and then press the
button (3-4, Front Panel Description) once. The display will then show the following
sequence:
5) Remove the electrode from your distilled water and place it into the pH 7.00 Buffer
solution (PH-07A) that came supplied.
Press the “HOLD” button once. The display
will show “7.00” flashing, followed by “END”. It will then return to the standard
measurement screen and this concludes the pH 7.00 calibration process as shown
below.