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51
mV & Relative mV MEASUREMENTS
mV/ORP MEASUREMENTS
Oxidation-reduction potential (ORP) measurements provide the quantification of the oxidizing or
reducing power of the tested sample.
To correctly perform a redox measurement, the surface of the ORP electrode must be clean and
smooth.
DIRECT MEASUREMENT
To measure the mV of a sample using the Direct reading
mode:
• Press
and then to enter mV Measure
mode (Select channel first for - HI5222 only).
• Select the Direct reading mode (see mV Setup for details).
• Place the tip of the ORP electrode 4 cm (1.5”) into the
sample to be tested and allow a few seconds for the
reading to stabilize.
• The instrument will display the measured mV value on
the LCD.
Note: If the reading is out of range, “----” will be displayed on the LCD.
DIRECT/AUTOHOLD MEASUREMENT
To measure mV of a sample using the Direct/AutoHold
reading mode:
• Press
and then to select mV Measure
mode (Select channel first for - HI5222 only).
• Select the Direct/AutoHold reading mode (see mV Setup
for details).
• Place the tip of the ORP electrode approximately 4 cm
(1.5”) into the sample to be tested.
• The measured mV value will be displayed on the LCD.
Press
and the “AutoHold” indicator will start
blinking on the LCD until the stability criteria is reached. The mV value will be frozen on the
LCD, along with “AutoHold” indicator.
• To return to normal Measure mode press .
Note: If the reading is out of range, “----” will be displayed on the LCD.
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