Trace Oxygen Analyzer | Installation | |
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2.3.2 Signal Processing
Figure 2-3 is a block diagram of the signal processing electronics described below.
Figure 2-3: Block Diagram of the Signal Processing Electronics
In the presence of oxygen the cell generates a current. The sensor has an internal thermistor compensation network.
The output of the sensor is converted to voltage millivolt range. This output is fed to a voltage amplifier. The internal thermistor network provides temperature compensation of the sensor output. The resistance of the network changes with temperature, compensating for the changes of the
The output from the temperature compensation amplifier is sent to an analog to digital converter (ADC), and the resulting digital concentration signal is sent to the microcontroller.
The digital concentration signal along with input from the front panel buttons (KEYBOARD) is processed by the microcontroller, and appropriate output signals are directed to the display and alarm relays.
Teledyne Analytical Instruments | 11 |