Thermo Scientific AquaPro Analyzer User Guide
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4.5.1
1 Point DO Calibration
1.
Select a point for calibration. The point can be a ppm standard or a sample value, a zero point or an air
calibration. Air calibration is quick and easy to use. The oxygen level depends on salinity (in mS/cm) and
pressure (in mmHg). Those variables should be determined and entered into the AquaPro in the Setup
menu for the channel. Scroll boxes allow the input of the salinity and pressure. The temperature in the DO
probe will be read live so temperature compensation occurs automatically within the measurement
calculation.
2.
After the settings are entered, press escape to return to Calibration in the main menu. Select the channel to
be calibrated and press enter to start calibration.
3.
The first calibration screen is Hold so the sensor can be put into the appropriate calibration location, then
press continue.
4.
Define the calibration. Sensor or Temperature calibration will to be performed. The measurement will be
adjusted to the new calibration point.
5.
Select the Type of Calibration, either Manual/Sample, Air Calibration, or Zero Calibration.
a.
The
Manual/Sample
calibration is performed in a known sample or standard or sample stream.
b.
Air Calibration
is a quick, accurate way to calibrate as the DO in air at a temperature and pressure is
typically pretty stable.
c.
Zero Calibration
point is the most time consuming method, as it requires very low level of oxygen in a
solution and time for the sensor to achieve that zero state.
6.
After selecting the calibration type, press escape to return to Calibration in the main menu. Select the
channel to be calibrated and press enter to start calibration.
7.
Start the calibration and follow the instructions on the screen. At the end, Calibration Successful will be
displayed, Calibration Unsuccessful with a description of the error will be displayed and the calibration will
not be logged, as it was not accepted.
4.6
RDO Pro
The RDO Pro probe is an Optical RDO measurement probe. It uses a specific RDO card in the AquaPro.
Although similar to the DataStick card, the RDO wiring is different for the Comms (+) and Comms (-) connections.
