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Thermo Scientific Orion Star A113 Benchtop & Star A123 Portable Dissolved Oxygen Meters
Temperature Calibration
The meter temperature display has a relative accuracy of ± 0.1 °C. The temperature sensors on the DO probe
may have varying temperature accuracies, usually ± 0.5 °C to ± 2 °C. Use this function only if it is necessary to
calibrate the temperature readings. Since the temperature offset calculated during the calibration is applied to all
future temperature measurements, recalibrate if a different probe is used.
1. In the measurement mode, press
to display the solution temperature or the membrane temperature,
denoted by a “m” is front.
2. Rinse the probe and NIST-traceable thermometers with distilled water, blot dry and place into a solution with
a known, stable temperature.
Note:
It is recommended that two NIST-traceable thermometers be used to measure and verify the temperature
of the solution.
Press
.
3. Wait for the readings to stabilize (about 5 to 10 minutes) and “READY” to stop flashing.. The meter will display
the original temperature read by the probe. Press
or
keys to enter the temperature value read by
the thermometer.
Note:
The calculated offset will be applied to all future temperature readings. To abort, press to end without
saving and return to the measurement mode.
4. When finished, press
to save and end calibration.
