Teledyne 3000PB Operating Instructions Manual page 24

2 Operational Theory
Figure 2-5: Block Diagram of the Model 3000PB Electronics
In the presence of oxygen the cell generates a current. A current to
voltage amplifier converts this current to a voltage, and then the voltage is
amplified in the second stage amplifier.
The second stage amplifier also supplies temperature compensation for
the oxygen sensor output. This amplifier circuit incorporates a thermistor,
which is physically located in the cell block. The thermistor is a temperature
2-8
Teledyne Analytical Instruments
Model 3000PB