wtw pH 3310 - Measuring the Ph Value

Operation pH 3310
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ba75802e02 12/2008
4.4.2 Measuring the pH value
Stability control
(AutoRead )
The stability control function (AutoRead) continually checks the stability
of the measurement signal. The stability has a considerable impact on
the reproducibility of measured values. The display of the measured
parameter flashes until a stable measured value is available.
You can start the Stability control manually at any time, irrespective of
the setting for automatic Stability control (see page 26) in the System
menu.
Note
You can prematurely terminate the Stability control function manually
with <ENTER> at any time. If the Stability control function is
prematurely terminated, the current measurement data are output to
the interface without AutoRead info.
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the pH electrode in the test sample.
3 Select the pH or mV display with <M>.
pH
6.949
24.8 °C
22.09.2008
08:00
Menu
USB output
1 Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
2Using <ENTER>, activate the Stability control function
manually.
The [AR] status indicator appears while the measured value is
assessed as not stable. The display of the measured
parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable
measured value is recognized. The current measurement data
are output to the interface.
Measurement data meeting the stability control criterion are
marked by AR.