Concal - wtw pH/ION 340i Operating Manual

pH/ION 340i
Two-point calibration

4.3.3 ConCal

For this procedure, use two buffer solutions:
l pH 7.0 ± 0.5
l any other buffer solution
Note
Skip the steps 2 and 8 if you use a pH electrode with a temperature
sensor.
1 Press the <CAL> key repeatedly until the ASY display and the
ConCal function display 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).
ISE U pH
S
6 A S
1
Time Baud
8 2 4
Day.Month No.
Year Ident
AutoCal DIN Auto Store
LoBat
AutoCal TEC ConCal
2 If required, enter the temperature of the first buffer solution with
< > < > while keeping the <RUN/ENTER> key depressed.
3 Immerse the pH electrode in the first buffer solution (pH 7.0 ±
0.5 in two-point calibration).
4 Press the <RUN/ENTER> key.
The measured pH value appears on the display.
5 Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with < > < >.
6 When the measured value is stable, press the <RUN/ENTER>
key. The value of the asymmetry appears.
7 Press the <RUN/ENTER> key. SLO appears.
Note
At this point, the ConCal calibration can be broken off with <M>. This
corresponds to a single-point calibration. When doing so, the instru-
ment uses the Nernst slope (-59,16 mV/pH at 25 °C) and the fixed
asymmetry of the electrode.
mol/L
Y
mV/pH
% ppm
mg/L
°F
8
%
TP
°C
CalError TempError
ARng AR RCL
Operation
29