Measurement Procedure - Thermo Scientific Orion Star A320 Series Manual

Thermo Scientific

Measurement Procedure

Prepare the electrodes according to the instructions in the electrode manuals. Connect all
electrodes to be used to the appropriate meter inputs. Make sure the electrodes are recently
calibrated and working correctly.
Ensure the meter measurement mode is set to the desired measurement parameter. For Orion
Star A325, Orion Star A326 and Orion Star A329 meters, press the f3 (channel) key until the
desired channel or channels are shown in the measurement mode.
1. Rinse the electrodes with distilled water or appropriate solution, blot gently with a lint-free
tissue to remove excess water and place into the sample.
2. Start the measurement and wait for the reading to stabilize or reach the predefined time.
a. Auto-Read: Press the measure (esc) key to start the measurement.
b. Continuous: Measurements will start immediately when in the measurement mode.
c. Timed: Measurements will start immediately when in the measurement mode.
3. Once the measurement is stable or reaches the set time, record all applicable parameters.
a. Auto-Read: Once the measurement is stable, it will be locked and held on the display
and the AR icon will remain solid. If the data log function is enabled, the measurement
will be exported to the data log.
b. Continuous: The flashing Stabilizing icon will update to the solid Ready icon when the
measurement is stable. If the data log function is enabled, press the log/print key to
export the measurement to the data log.
c. Timed: Measurements will be recorded at the predefined time interval. If the data log
function is enabled, the < icon will be shown when each time interval has elapsed and
the measurement is exported to the data log.
4. Remove the electrodes from the sample, rinse with distilled water or appropriate solution,
blot gently with a lint-free tissue to remove excess water and place into the next sample.
5. Repeat steps 2 through 4 for all samples. When all samples have been measured, store the
electrodes according to the instructions in the electrode manuals.
Chapter 4 Using the pH or pH/ISE Channel
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Orion Star A320 Series Portable Meter User Manual 63
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