Calibration
and Measurement
|
Section 4
Thermo Scientific
Orion Dual Star pH/ISE Benchtop Meter User Manual
|
35
pH Calibration Procedure (1 to 6 points)
Note: In most calibration screens, press the
f1 (escape) key to return to the measurement
mode without saving the calibration.
1. In the measurement mode, press the cal key.
2. Dual channel display only: Press the ▲ / ▼ keys to select the channel to be calibrated and
press the f2 (accept) key.
3. Rinse the pH electrode (ATC probe, stirrer probe and reference electrode, if applicable) with
distilled water, blot dry with a lint-free tissue and place the electrode(s) into the buffer.
4. When the electrode and buffer are ready, press the f3 (start) key.
5. Wait for the pH value on the meter to stop flashing and perform one of the following actions:
a. Press the f2 (accept) key to accept the pH value.
b. Use the numeric keypad and decimal key to enter the value of the buffer at the
measured temperature. Press the f3 (clear) key to delete any of the digits. Once the
buffer value is correct, press the f2 (accept) key.
6. Press the f2 (next) key to proceed to the next buffer and repeat steps 3 through 5 or press
the f3 (cal done) key to end the calibration. If a one point calibration is performed, enter the
electrode slope using the numeric keypad and decimal key and press the f2 (accept) key.
7. Once the f3 (cal done) key is pressed, the meter will display a calibration summary including
the average slope. Perform one of the following actions:
Important Note: The
f2 (log/print) key must be pressed to save the
calibration. Only pressing the f3 (cal done) key without pressing the
f2 (log/print) key will not save the calibration.
a. Press the f2 (log/print) key to save and end the calibration, export the calibration data to
the calibration log and export the calibration data to a printer or computer, if a printer or
computer is connected to the meter and enabled in the setup menu. The meter will
automatically proceed to the measurement mode.
b. Press the f3 (graph) key to view a point-by-point graph of the calibration. After viewing
the graph, press the f1 (back) key to return to the calibration summary, press the
f3 (log/print) key to save and end the calibration, export the calibration data to the
calibration log, export the calibration data to a printer or computer (if applicable) and
automatically proceed to the measurement mode or press the f2 (escape) key to return
to the measurement mode without saving the calibration.
c. Press the f1 (cal edit) key to edit the calibration points. Press the ▲ / ▼ keys to
highlight the calibration point to be edited and press the f2 (select) key. Press the ▲ / ▼
keys to highlight Remeasure, Edit or Delete and press the f2 (select) key.
Section 4
|
Calibration and Measurement
i. If Remeasure is selected, repeat steps 3 through 5. If a one point calibration is
performed, enter the electrode slope using the numeric keypad and decimal key and
press the f2 (accept) key. Press the ▲ / ▼ keys to highlight another calibration point
to be edited and press the f2 (select) key or press the f1 (back) key to return to the
calibration summary.
ii. If Edit is selected, use the numeric keypad and decimal key to enter a new buffer
value and press the f2 (accept) key. Press the ▲ / ▼ keys to highlight another
calibration point to be edited and press the f2 (select) key or press the f1 (back) key
to return to the calibration summary.
iii. If Delete is selected, press the f2 (yes) key to delete the selected calibration point. If
deleting the calibration point changes the calibration to a one point calibration, enter
the electrode slope using the numeric keypad and decimal key and press the
f2 (accept) key. Press the ▲ / ▼ keys to highlight another calibration point to be
edited and press the f2 (select) key or press the f1 (back) key to return to the
calibration summary.
8. Proceed to the pH Measurement Procedure section.
pH Measurement Procedure
1. Rinse the pH electrode (ATC probe, stirrer probe and reference electrode, if applicable) with
distilled water, blot dry with a lint-free tissue and place the electrode(s) into the sample.
2. If the stirrer probe is in use, press the stirrer key to turn on the stirrer probe. Press the
▲ / ▼ keys to adjust the speed of the stirrer probe.
3. Wait for the measurement to stabilize and record the pH and temperature of the sample
when the meter indicates that the measurement is stable. The read type selected in the EZ
Startup menu or setup menu will determine how the pH measurements are displayed by the
meter. The available read types are Auto-Read, on ready, at time intervals, continuous,
value change in measurement and timed reading. To review or change the available read
type, refer to the
Setup Menu
section.
4. If the stirrer probe is in use, press the stirrer key to turn off the stirrer probe.
5. Remove the electrode(s) from the sample, rinse with distilled water, blot dry, place the
electrode(s) into the next sample.
6. Repeat steps 2 through 5 for all of the samples.
7. When all of the samples have been measured, store the electrode(s) according to the
instructions in the electrode user guides.
36
|
Orion Dual Star pH/ISE Benchtop Meter User Manual
Thermo Scientific