9Redox/ORP Electrode User Guide
Electrode MeasurementsDirect Measurements
Direct oxidation-reduction potential (ORP) measurements
can be used to determine the oxidizing or reducing capability
of a solution and are commonly made in polluted streams,
chlorinated waters, industrial wastewaters and other water
samples.
1. Prepare the electrode according to the Electrode
Preparation section.
2. Set the meter to the millivolt, relative millivolt or EH
measurement mode.
3. Place the electrode into the sample solution.
4. When the reading stabilizes, record the displayed mV
potential and temperature.
Note: Platinum redox electrodes may give unstable readings in
solutions that contain chromous, vanadous and titanous ions or
other ions that are stronger reducing agents than hydrogen or
platinum.