Orion Star A326 Portable pH/RDO/DO Meters
6
Measurement
The Orion Star A326 meter is capable of showing two measurements simultaneously on the display. The
first channel can be set to measure pH, mV, RmV (relative mV) or ORP. The second channel can be set to
measure DO -%sat (dissolved oxygen in percent saturation), DO - mg/L (dissolved oxygen in milligrams
per liter) or DO -°C (probe membrane temperature).
The meter can be set to display one or both of these measurement channels, depending on the operator’s
needs. In the measurement mode, press
f3 (channel)
to scroll through a single measurement display of
channel one or two or a dual measurement display of channel one and two. To change the measurement
mode of a channel, press
f3 (channel)
until the single measurement display of that channel is shown
and then press
until the correct mode is shown.
Note:
It is highly recommended that any unused channels not be shown on the meter display while
taking measurements, since the meter waits for all displayed channels to stabilize before logging the
measurement data.
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, RDO optical dissolved oxygen probe or polarographic dissolved oxygen probe 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 applicable measurement parameters 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 applicable measurement parameters and temperature of the sample.
c. 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 applicable measurement parameters and temperature of the sample
can be recorded when the display shows
ready
.
3. Remove the electrodes 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 electrodes according to their user guides.
