wtw pH 315i Instrucciones De Operación página 7

pH 315i
pH
C t 1
2 8
4
TP
°C
AutoCal TEC
pH
C t 2
2 4 8
TP
°C
AutoCal TEC
pH
- 5 9 4
mV/pH
pH
2
mV
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AutoCal TEC / AutoCal DIN procedure:
The following example shows the AutoCal TEC calibration. In the
AutoCal DIN calibration, Cd... appears on the display instead of Ct....
Otherwise, both procedures are identical.
Note
During the calibration, the portable instrument pH 315i automatically recog-
nizes the nominal value of the buffer solution used. Depending on the instru-
ment setting, either the current electrode voltage or the buffer nominal value
is displayed during the calibration procedure. For details of selecting the dis-
play, see C
ONFIGURATION
l Connect the pH electrode to the measuring instrument.
l Press the <CAL> key repeatedly until the display Ct1 and the function dis-
play AutoCal TEC appears. The sensor symbol displays the evaluation of
the last calibration (or no sensor symbol in the delivery state or after the
measurement parameter has been reset).
l Immerse the pH electrode in the first buffer solution.
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.
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.
l Immerse the two-point calibration pH electrode in the second buffer so-
lution to continue.
l Press <RUN/ENTER>. The AutoRead measurement begins. The elec-
trode voltage (mV) or the buffer nominal value appears on the display.
l If the measured value is stable, the instrument displays the value of the
slope and the evaluation of the calibration in calibration range I.
l Press <RUN/ENTER>. The instrument displays the value of the asymme-
try in calibration range I.
.
Calibration
7