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7
The display will show the default temperature of 25 °C or the last temperature reading with
the blinking “MTC” and “°C” (or “°F”) tags.
The temperature can now be adjusted with the UP and DOWN arrow keys (from –20.0 °C to
120.0 °C).
m
m
m
m
mV / REL
V / REL
V / REL
V / REL
V / REL m
m
m
m
mV MEASUREMENTS
V MEASUREMENTS
V MEASUREMENTS
V MEASUREMENTS
V MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements (see “Accessories”
section).
Oxidation-Reduction Potential (ORP) measurements provide the quantification of the oxidizing or
reducing power of the tested sample.
To perform an ORP measurement correctly, the surface of the electrode must be clean and
smooth.
• If necessary, press the RANGE key until the display changes to mV/Rel mV.
• Submerge the ORP electrode tip (4cm/1½") into the sample to be tested and allow a
few seconds for the reading to stabilize.
• The instrument displays the mV reading on the primary LCD or Rel mV reading if a Rel mV
calibration has been performed and the temperature on the secondary LCD.
If measurements are taken successively in different samples, it is recommended to rinse the
electrode thoroughly with water and then with some of the sample to be tested.
The pH reading is affected by temperature. In order to measure the pH accurately, the
temperature effect must be compensated. To use the Automatic Temperature Compensation
(ATC) feature, connect and submerge the MA 831R
MA 831R
MA 831R
MA 831R
MA 831R temperature probe into the sample as
close as possible to the electrode and wait for a few seconds. The “ATC” tag will be
displayed.
If Manual Temperature Compensation (MTC) is desired, the temperature probe must be
disconnected from the instrument.
