Orion Benchtop pH/ISE Meter Instruction Manual
Other Measurement Modes
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B. Orion 420Aplus, 710Aplus Millivolt Measurements
The Orion 420Aplus and 710Aplus can be used to measure absolute or
relative millivolts. The millivolt modes are useful when performing
potentiometric titrations or preparing calibration curves. Detailed
instructions for any Orion electrode are given in the electrode instruction
manual. Titration instructions are included in the Orion Redox Electrode
(Orion 9678 or 9778) Instruction Manual, or in standard analytical
chemistry texts.
Absolute Millivolts
Absolute millivolts are displayed with 0.1 mV resolution in the range of
-1600.0 to +1600.0 mV.
Access the absolute millivolt mode by pressing mode until the mV mode
indicator is displayed.
Relative Millivolts
Relative millivolts are displayed with 0.1 mV resolution over the range of
-1999.9 to +1999.9 mV. (Absolute millivolt range ± 1600.0).
1. Access relative millivolt mode by pressing mode until the REL mV
mode indicator is displayed.
2. Set the relative millivolt offset by pressing 2nd then cal.
CALIBRATE and the current absolute millivolts will be displayed.
Once the signal is stable, the meter displays 0.0. Use or to enter
the desired value, or leave the setting at 0.0. Press yes. The meter
automatically returns to MEASURE and all relative millivolt
measurements will be based on the offset.
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