Thermo Scientific Orion Star A320 Series Manual page 49

Thermo Scientific
Temperature Calibration
When using Orion Star A320 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, pH/ISE 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 A323 meter, press the p or q key to highlight Solution Temperature,
Membrane Temperature or Sol & Mem Temperature and press the f3 (select) key.
b. If using the Star A326 or Star A329 meter, press the p or q key to highlight ATC,
Solution Temperature, Membrane Temperature, Sol & Mem Temperature or ATC, Sol
& Mem Temp 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.
Temperature Calibration for Meters with Multiple Temperature Inputs
When a polarographic dissolved oxygen sensor with two temperature inputs is connected with
an Orion Star A323 RDO/DO meter, Orion Star A326 pH/RDO/DO meter or Orion Star A329
pH/ISE/conductivity/RDO/DO meter, the solution temperature input and membrane temperature
input can be calibrated separately or together.
When an ATC probe (or conductivity sensor with built-in temperature) and polarographic
dissolved oxygen sensor are both connected to the Orion Star A326 pH/RDO/DO meter or
Orion Star A329 pH/ISE/conductivity/RDO/DO meter, the temperature calibration for both inputs
can also be performed together.
Chapter 3
Orion Star A320 Series Portable Meter User Manual
Meter Setup Menus
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