Concal - wtw pH 3300i Operating Manual

pH 3300i/3400i
Single-point
calibration
Two-point
calibration
ba75682e02 03/2008

4.3.3 ConCal

Use any buffer solution for this rapid method.
The calibration will be the more exact the nearer the pH value of the buffer
solution is to that of the test sample.
For this procedure, use two buffer solutions:
pH 7.0 ± 0.5
any other buffer solution
Note
Skip the steps 2 and 9 if you use a pH electrode with a temperature sensor.
1 Press the <CAL> key repeatedly until the display ASY and the func-
tion display ConCal appears. The sensor symbol displays the evalu-
ation of the last calibration (or no sensor symbol in the delivery state
or after the measurement parameter has been reset).
2 If necessary, enter the temperature of the first buffer solution with
<▲> <▼>.
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 Press the <RUN/ENTER> key. The value of the asymmetry (mV) and
the sensor symbol appear on the display.
7 Press the <RUN/ENTER> key. SLO appears on the display.
Note
At this point, the ConCal calibration can be broken off with <M>. This corre-
sponds to a single-point calibration. For this, the instrument uses the
Operation
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