Measuring The Ph Value - wtw Multi 3410 Operating Manual

Operation
Stability control
(AutoRead )
36

4.6.2 Measuring the pH value

1 Perform the preparatory activities according to section 4.6.1.
2 Immerse the IDS pH sensor in the test sample.
Info 22.09.2009 08:00
3 Select the pH or mV display with <M>.
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 33) in the Measure-
ment menu.
1 Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
2 Using <MENU/ENTER>, activate the Stability control function
manually.
The [AR] status indicator appears while the measured value is
assessed as not stable. A progress bar is displayed and the
display of the measured parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable
measured value is recognized. The progress bar disappears
and the display of the measured parameter stops flashing.
The current measurement data is output to the interface. Mea-
surement data meeting the stability control criterion is marked
by AR.
Multi 3410
ba75863e02 12/2009