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Theory of Operation Teledyne API – Technical Manual - Model 300E Family CO Analyzers
238
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
Detecto
r
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
COM1 COM2
Optional
Ethernet
Interface
A4
Optional
O
2
Sensor
Optional
CO
2
Sensor
O
2
SENSOR
TEMP
(optional)
Figure 11-9: M300E/EM Electronic Block Diagram
04288D DCN5752