Trace Oxygen Analyzer
Operational Theory
Teledyne
Analytical
Instruments
15
Figure 2-5: Flow Diagram
2.4 Electronics and Signal Processing
The Model 3020T Trace Oxygen Analyzer uses an 8031
microcontroller with 32 kB of RAM and 128 kB of ROM to control all
signal processing, input/output, and display functions for the analyzer.
System power is supplied from a universal power supply module
designed to be compatible with most international power sources. See
Chapter 5
Maintenance
for the location of the power supply and the
main electronic PC boards.
The signal processing electronics including the microprocessor,
analog to digital, and digital to analog converters are located on the
motherboard at the bottom of the case. The preamplifier board is
mounted on top of the motherboard. These boards are accessible after
removing the access panel. Figure 2-6 is a block diagram of the
Analyzer electronics.
In vacuum service the
restrictor should be
placed here.
Sample In
Span In
Zero In
Flowmeter
Exhaust Out
Solenoid
Valves
Restrictor
Cell
In normal service the
restrictor should be
placed here.
Components in the shaded area are in
the -C option (internal control valves)
only and are not shown in the piping
diagram above.