Xylem ProLab 4000 MULTIPARAMETER BENCHTOP METER - Manual (Page 94)

ORP voltage ProLab 4000
94 ba75646e02 01/2010
As an alternative you can also determine the difference of the ORPs of
two solutions with one ORP electrode only. To do so, first define the
ORP of one solution as the zero point.
Stability control TheStability control function checks the stability of the measurement
signal. The stability has a considerable impact on the reproducibility of
measured values. The background color is red until the measured
value is stable.
Regardless of the setting for Autom. stability control (see page 63) in
the System menu, you can start the Stability control function manually
at any time.
1 Perform the preparatory activities (see page 69).
2 Prepare the reference solution for the determination of the ref-
erence point.
3 Immerse the electrode in the reference solution.
4 Highlight the channel of the electrode in the measured value
display.
5 If necessary, select the U display with <MODE>.
6 Display the voltage of the current zero point with <CAL> or
Measuring / Referenz / Determine reference....
7 Measure the reference solution with <OK>.
The measured voltage is defined as the zero point.
or
Terminate the display of the zero point with <ESC>.
8 Rinse the electrode and immerse it into the test sample.