Millivolt (Mv) Calibration (6+ Only) - Oakton pH 5+ Instruction Manual

Instruction Manual

3.3 Millivolt (mV) Calibration (6+ only)

Oxidization Reduction Potential (ORP or Redox) as measured by an ORP electrode in
mV units is not a precise measurement, but is useful as a relative indicator. As such,
mV offset adjustment is not meant to enhance accuracy, but rather to make readings
comparable to a reference.
Commercial ORP solutions are commonly used as a check standard—a meter/electrode
system is verified to be close to a given value although adjustments are not made.
These solutions can be used as a calibration standard in which adjustments are made in
an attempt to match the ORP value, however results are often difficult to reproduce.
1. Turn on the meter and select mV mode by pressing
electrode into a solution with a known mV value (e.g. Zobel, Light's, quinhydrone, or
iodidetriiodide) and provide brief or slow stirring.
2. Press
un-adjusted mV value will blink.
3. Use (pH 6+) or
The maximum adjustment is ± 50 mV.
4. When the reading has stabilized, the mV annunciator will stop blinking. Press
to confirm the value. "" (confirm) will display briefly. The meter will automatically
save the calibration, cease blinking, and begin mV measurement.
to begin mV calibration mode. "" (calibrate) will display briefly. The
(Ion 6+) to adjust the reading to the desired value.
12
pH 5+, pH 6+, Ion 6+
if necessary. Dip the ORP