Thermo Scientific Orion Star A220 Series User Manual page 30

Chapter 3 Meter Setup Menus
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30 Orion Star A220 Series Portable Meter User Manual
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Temperature Unit
1. In the measurement mode, press the setup key.
2. Press the p, q, t or u key to highlight pH Channel, COND Channel or DO/RDO
Channel and press the f3 (select) key.
3. Press the p or q key to highlight Temperature and press the f3 (select) key.
4. Press the p or q key to highlight Temperature Unit and press the f3 (select) key.
5. Press the p or q key to highlight Celsius or Fahrenheit and press the f3 (select) key.
6. Press the measure (esc) key to return to the measurement mode.
Temperature Calibration
When using Orion Star A220 series portable meters, a temperature calibration can be
performed on an ATC probe, conductivity sensor with built-in temperature or polarographic
dissolved oxygen sensor with built-in temperature when the probe or sensor is connected to the
meter. Use the temperature calibration function only when necessary, since the meter has a
relative temperature accuracy of ±0.1°C and ATC probes have varying accuracies, usually
±0.5°C to ±2°C. Since the temperature offset calculated during the calibration is applied to all
future temperature measurements, recalibrate the temperature if a different ATC probe is used.
1. In the measurement mode, press the setup key.
2. Press the p, q, t or u key to highlight pH Channel, COND Channel or DO/RDO
Channel and press the f3 (select) key.
3. Press the p or q key to highlight Temperature and press the f3 (select) key.
4. Press the p or q key to highlight Temperature Calibration and press the f3 (select) key.
5. Press the p or q key to highlight ATC and press the f3 (select) key.
a. If using the Star A223 meter, press the p or q key to highlight Solution Temperature,
Membrane Temperature or Sol & Mem Temperature and press the f3 (select) key.
6. Place the ATC probe and/or sensor into a solution with a known, stable temperature. Two
NIST-traceable thermometers should be used to measure and verify the temperature.
7. Wait for the temperature value on the meter to stabilize and then press the f3 (edit) key to
access the popup number entry screen and enter the temperature value.
a. Press the p, q, t or u key to highlight a number, decimal point or negative sign and
then press the f3 (enter) key to select the highlighted item. Repeat until the desired
temperature value is shown at the top of the screen.
b. Press the f2 (done) key to exit the number entry screen.
8. Press the f2 (accept) key to save the entered temperature value.
9. Press the f1 (meas) key to return to the measurement mode.
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