2-9

Ultra Trace Oxygen Analyzer Operational Theory 2

Teledyne Analytical Instruments
Figure 2-7: Block Diagram of the Model Ultra Trace 3000 Electronics
Power
Supply
A to D
Converter
Current
to Voltage
Amplifier
Second
Stage
Amplifier
System
Failu re
Alarm
Displays
Micro-
Processor
Processing
Auto
Range
0-1 V
4-20 mA
D to A
Converter

Concentration

Range

Self Test

Signal

Sensor
Thermistor
T E C
Temperature
Controller
0-1 V
4-20 mA
FAN
HEAT
SINK