Thermo Scientific Orion Star A111, Справочное руководство

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Thermo Scientific Orion Star A111 Benchtop and Star A121 Portable pH Meters
Chapter 4 Calibration and Measurement
pH Calibration and Measurement
pH Calibration
1. Press to display pH for pH measurement mode.
2. Select fresh pH buffers. If calibrating more than one point (highly recommended), select pH buffers that bracket the
expected sample pH and are at least one pH unit apart.
3. Press . Rinse the electrode (and ATC probe, if separate) with distilled water, blot dry and place into the buffer.
4. Wait for “READY” to appear.
a. With automatic buffer recognition (default, AUTO CAL appears at the top of the display): to calibrate
additional points, repeat steps 3 and 4a.
b. With manual calibration (MAN CAL appears at the top of the display): press or to set value.
To calibrate additional points repeats steps 3 and 4b.
5. When finished, press to save and end calibration.
a. For one-point calibration, press or to edit the slope and press the enter key to save and
return to measurement mode.
b. For two- or three-point calibration, the slope will be displayed and the meter will automatically proceed
to measurement mode.
pH Measurement
1. Prepare the pH electrode according to the electrode instructions. Press to display pH for pH measurement mode.
2. Rinse the electrode (and ATC probe, if separate) with distilled water, blot dry and place into the sample.
3. If the meter is in AUTO-READ mode (meter default) press . If the meter is in continuous read mode, the meter
will immediately start taking readings. Record the pH and temperature of the sample when “READY” is displayed and
“pH” stops blinking.
Note:
If in AUTO-READ mode and memory storage is enabled, the reading will automatically be stored when the “AR”
appears. If in continuous read mode and memory storage is enabled, press to store into the meter’s memory .
4. Remove the electrode (and ATC probe, if separate) from the sample, rinse with distilled water, and blot dry. To continue
taking measurements , place electrode (and ATC probe, if separate) into the next sample and repeat steps 3 and 4.
5. When finished measuring all samples, store electrode according to electrode instructions.