wtw Multi 340i Bedienungsanleitung Seite 8

pH calibration
C t 1
C t 2
5 9 4
8
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AutoCal TEC procedure (single and two-point calibration):
l Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key until the status display pH (pH measure-
ment) or U (measurement of the ORP voltage) appears.
l Press the <CAL> key. The Ct1 display and the function display AutoCal
pH
TEC appears. The sensor symbol displays the evaluation of the last cal-
ibration (or no sensor symbol in the delivery state or after the measure-
ment parameter has been reset).
2 4 8
°
C
TP
l Immerse the pH electrode into the first buffer solution.
AutoCal TEC
l When measuring without a temperature sensor:
Enter the temperature of the first buffer solution with < > < > while
pressing the <RUN/ENTER> key.
l Press <RUN/ENTER>. The AutoRead measurement begins. The elec-
trode voltage (mV) or the buffer nominal value appears on the display. If
the measured value is stable, Ct2 appears.
pH
2 4 8
°
C
TP
AutoCal TEC
l Immerse the two-point calibration pH electrode in the second buffer so-
lution to continue.
l When measuring without a temperature sensor:
Enter the temperature of the second buffer solution with < > < > while
pressing the <RUN/ENTER> key.
l Press <RUN/ENTER>. The AutoRead measurement begins. The elec-
trode voltage (mV) or the buffer nominal value appears on the display.
l When the measured value is stable, the instrument displays the value of
pH
mV/pH
the slope and the calibration evaluation.
l Press <RUN/ENTER>. The instrument displays the value of the asym-
pH
mV
metry.
2
l Switch to the measuring mode with <M>.
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Note
At this point, the AutoCal TEC calibration can be terminated
with <M>. This corresponds to a single-point calibration.
To do this, the instrument uses the Nernst slope (-59.2 mV/pH
at 25 °C) and determines the asymmetry of the electrode.
Multi 340i