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9. ORP
9.1. PREPARATION
The instrument measures the ORP generated by the pH electrode
while in mV mode.
For accurate ORP measurements, the surface of the electrode
must be clean and smooth. Pretreatment solutions are available
to condition the electrode and improve its response time (see
ACCESSORIES section).
The ORP range is factory calibrated.
Note: For direct ORP measurements, use an ORP probe. MA9020
ORP Solution can be used to confirm that the ORP sensor measures
correctly. mV readings are not temperature compensated.
9.2. MEASUREMENT
1. Press the RANGE/ until the display changes to mV mode.
2. Remove the probe protective cap and immerse the tip
approximately 4 cm (1 ½") into the sample. Allow the reading
to stabilize ( tag turns off).
The ORP mV reading is displayed on the first LCD line.
The second LCD line displays the temperature of the sample.
ORP 31
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