wtw pH 3310 - Measuring the ORP

Operation pH 3310
30
ba75802e02 12/2008
4.4.3 Measuring the ORP
Note
ORP electrodes are not calibrated. However, you can check ORP
electrodes using a test solution.
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
1 Perform the preparatory activities according to section 4.4.1.
2 Submerse the ORP electrode in the sample.
3 Select the mV display with <M>.
U
157.0 mV
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 [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.