Thermo Scientific Orion Star A111, Reference Manual

Page: 17 / 30

13
Thermo Scientific Orion Star A111 Benchtop and Star A121 Portable pH Meters
Temperature Measurement and Calibration
Temperature Measurement
The meter ATC temperature display is automatically shown for at the top, secondary display on the meter. To read only
temperature and see the temperature on the primary, lower display, follow the instructions below.
1. In the measurement mode, press to display the temperature value on the primary display. (The temperature
value at the top of the meter will match that of the lower, larger display field.)
2. Rinse the ATC probe with distilled water, blot dry and place into the sample. If the meter is is AUTO-READ mode
(meter default), press . If the meter is in continuous read mode, the meter will immediately start taking
readings.
3. Record the temperature of the sample when “READY” stops .
Note:
If in AUTO-READ mode and memory storage is enabled, the reading will automatically be stored when
the "AR" icon appears. If in continuous read mode and memory storage is enabled, press to store the reading into
the meter's memory.
4. Remove the ATC probe from the sample, rinse with distilled water, blot dry. To continue taking measurements repeat
steps 2 through 4.
5. When finished measuring all samples, store electrode according to electrode instructions.
Temperature Calibration
The meter ATC temperature display has a relative accuracy of ± 0.1 °C. ATC probes 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 ATC probe is used.
1. In the , press to display the temperature reading.
2. When the ATC probe is ready, press Rinse the ATC probe and NIST-traceable thermometers with distilled water,
blot dry and place into a solution with a known, stable temperature. It is recommended that two NIST-traceable
thermometers be used to measure and verify the temperature of the solution.
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 ATC 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.