Thermo Fisher Scientific CyberScan DO 300 - Manual (Page 10)

Instruction Manual DO 300
7
4.2 Temperature Calibration
DO in mg/L is dependent on temperature, so it is first necessary
to verify the temperature reading. Temperature calibration is
accessible from the mg/L or ppm measurement mode.
The built-in temperature sensor in the probe is factory calibrated.
Calibrate your sensor only if you suspect temperature errors may
have occurred over a long period of time or if you have a
replacement probe.
1. Dip the DO probe into a solution with known temperature.
Allow sufficient time for the temperature to stabilise.
NOTE: Use an accurate temperature meter or bath to determine
the solution’s temperature.
2. Ensure that the meter is in measurement mode. Press MODE
key if necessary to select mg/L mode.
3. Press CAL key to go into calibration mode of mg/L. The
primary display shows the measured DO in mg/L and the
secondary display shows the temperature.
4. Press MODE key to go into temperature offset adjustment
mode. The primary and secondary displays will show the
temperature values.
5. Press MI/ or MR/ key to set the correct temperature value.
NOTE: Temperature calibration is restricted to ± 5°C from the
factory default value displayed during calibration (shown in the
secondary display).
6. Press ENTER key to confirm the adjusted temperature.
NOTE: To exit from Temperature Calibration mode without
confirming calibration, DO NOT press ENTER in Step 6. Press
CAL/MEAS instead.
Since temperature readings affect the accuracy of the mg/L
measurements, it is strongly recommended to carry out a mg/L
calibration after a temperature calibration is done.
(The values shown above are for illustration purpose. Your meter may display different values depending on the settings &
your environmental conditions)