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Percent Oxygen Analyzer
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.
Teledyne Analytical Instruments
Operational Theory
21
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