Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 238)

Theory of Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 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
Detector
Output
Segment Sensor
M / R Sensor
GFC
Wheel
GFC
Motor
Zero/Span
Valve
Options
Wheel
Heater
Bench Heater
Keyboard &
Display
S
ensor S
tat
us
& Cont
rol
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: GFC 7001E/EM Electronic Block Diagram