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Percent Oxygen Analyzer
2.3
2.3.1 General
The signal processing uses an Intel microcontroller with on-board RAM
and 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.
The power supply circuitry is on the Power Supply PCB, which is mounted
vertically, just behind the rear panel of the Control Unit.
The signal processing electronics including the sensor amplifier,
microcontroller, analog to digital, and digital to analog converters are located on
the Main PCB, which is mounted vertically, just behind the front panel of the
Control Unit.
2.3.2 Signal Processing
Figure 2-3 is a block diagram of the signal processing electronics described
below.
TE M PE RATU RE
CO M PE NS AT ION
M FC
NET W ORK ON
S ENSO R P CB
Microamp
Output
I-22 Sensor
Figure 2-3: Block Diagram of the Signal Processing Electronics
Electronics
Millivolt
Potput
S ENSO R
A M PLIFIE R
K EY BO ARD
Teledyne Analytical Instruments
Operational Theory 2
E –I CON V
A D C
D A C
M ICRO -
CO NT RO L-
LER
DIS P LAY
RELAYS
RELAYS
4–20 m A dc
Concentration
0–10 V dc
RAN GE ID
A LAR M S
A LAR M S
2-5
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