Teledyne 3300ZB operating instructions Block Diagram of the Signal Processing Electronics

Trace Oxygen Analyzer Operational Theory

2.3.2 Signal Processing

Figure 2-1 is a block diagram of the signal processing electronics described below.

Figure 2-1: Block Diagram of the Signal Processing Electronics

In the presence of oxygen, the sensor(s) produce a current. A current to voltage amplifier (I–E AMPL) converts this current to a voltage.

The output from the I-E amplifier and subsequent buffer circuit (not shown) is sent to an analog to digital converter (ADC), and the resulting digital concentration signal is sent to the micro controller.

The digital concentration signal along with input from the front panel buttons (KEYBOARD) is processed by the micro controller, and appropriate output signals are directed to the display, alarm relays, and

Teledyne Analytical Instruments 7