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Percent Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 21
located on the Main PCB, which is mounted vertically, just behind the
front panel of the control unit.
2.5.2 Signal Processing
Figure 2-3 is a block diagram of the signal processing electronics
described below.
Figure 2-3: Signal Processing Block Diagram
In the presence of oxygen the sensor generates a millivolt potential
which is fed to a voltage amplifier. The output from the sensor amplifier
is sent to an analog to digital converter (ADC), and the resulting digital
concentration signal is passed to the micro-controller. The ADC has a
second channel which monitors the temperature of the probe.