Chapter 4
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Using the pH Channel
ORP Calibration Procedure (Relative mV Mode)
Orion Star A221 pH meters can perform an ORP calibration in the relative mV (RmV) mode
using one standard with easy to follow onscreen instructions to assist with the calibration
process.
Use the Thermo Scientific Orion ORP standard (Catalog Number 967901 or 967961) or other
ORP standard as desired. Prepare the electrode according to the instructions in the electrode
manual. Connect all electrodes to be used to the appropriate meter inputs.
Make sure the meter measurement mode is set to RmV.
1.
Press the f1 (cal) key to start the calibration.
2.
Rinse the electrode and any other electrodes in use with distilled water, blot gently with a
lint-free tissue to remove excess water and place into the standard.
3.
When the electrode and standard are ready, press the f3 (start) key.
4.
Wait for the mV value on the meter to stabilize (indicated by the flashing stabilizing or
solid ready icon) and perform one of the following actions:
a.
Press the f2 (accept) key to accept the mV value.
or
b.
Press the f3 (edit) key to access the popup number entry screen and manually enter
the mV value expected at the measured temperature.
i.
Press the
p
,
q
,
t
or
u
key to highlight a number, decimal point or negative
sign; press the f3 (enter) key to select the highlighted item and repeat until the
desired value is shown at the top of the screen.
ii.
Press the f2 (done) key to save the value and exit the number entry screen.
iii.
Press the f2 (accept) key to accept the manually entered value.
5.
The meter will display the calibration summary including the mV offset and export the data
to the calibration log. Press the f1 (meas) key to proceed to the measurement mode or
press the f2 (print) key to export the calibration data to a printer or computer.
Thermo Scientific
Orion Star A220 Series Portable Meter User Manual
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39
Summary of Contents for Orion Star A220 Series
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