Orion Star A221 and Star A321 Portable pH Meters
5
Measurement
Press
while taking a measurement in the continuous measurement mode to freeze the display and
press
a second time to unfreeze the display and continue the measurement. Press
while taking
a measurement to manually export the measurement to the data log, if the data log is enabled in the
setup menu.
1. Rinse the pH electrode and any other electrodes in use with distilled water, blot dry with a
lint-free tissue and place into the sample.
2. Start the measurement and wait for it to stabilize.
a. If the meter is in
AUTO-READ
mode (default setting), press
to start the measurement. When
the
icon stops flashing, record the pH and temperature of the sample. Press
again to start
a new measurement.
b. If the meter is in continuous mode, the meter will immediately start taking a measurement and
update the display whenever the measurement changes. Wait for the display to show
ready
and
record the pH and temperature of the sample.
c.
Star A321
meter only -
If the meter is in timed mode, the meter will log measurements at the
preselected time interval, regardless of the measurement stability. The meter will update the display
whenever the measurement changes, so the pH and temperature of the sample can be recorded
when the display shows
ready
.
3. Remove the electrode from the sample, rinse with distilled water, blot dry and place into the next sample.
4. Repeat steps 2 and 3 for all samples.
5. When all samples have been measured, store the electrode according to its user guide.
