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THEORY OF OPERATION
Model 300E Carbon Monoxide Analyzer
Instruction Manual
164
P/N 04288 Rev: A
10.3. Electronic Operation
10.3.1.
Overview
Figure 10-8 shows a block diagram of the major electronic components of the
Model 300E.
Analog Outputs
Sample
Flow &
Pressure
Sensors
Status Outputs:
1 – 6
Control Inputs:
1 – 8
PC 104
CPU Card
Disk On
Chip
Flash Chip
RS–232
or RS-485
RS – 232
Power-Up
Circuit
Internal
Digital I/O
I
2
C
Bus
Sensor Inputs
Box
Temp
Thermistor
Interface
SAMPLE
TEMP
BENCH
TEMP
WHEEL
TEMP
A1
A2
A3
Optional
4-20 mA
MOTHER
BOARD
A/D
Converter
(V/F)
PC 104 Bus
External
Digital I/O)
Back Panel
Connectors
Analog
Outputs
(D/A)
TEC Control
PHT
Drive
Detector
Output
Segment Sensor
M / R Sensor
GFC
Wheel
GFC
Motor
Zero/Span
Valve
Options
Wheel
Heater
Bench Heater
Keyboard &
Display
Sensor
Status
&
Control
Optical
Bench
RELAY
BOARD
IR
Source
Photo-
detector
SYNC
DEMOD
C
O
M
E
A
S
C
O
R
E
F
CPU Status
LED
Schmidt
Trigger
PUMP
COM-A COM-B
Optional
Ethernet
Interface
Figure 10-8: 300E Electronic Block Diagram
Содержание 300E
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