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Theory of Operation Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 198
Analog Outputs
Sample Flow
& Pressure
Sensors
Status Outputs:
1 – 6
Control Inputs:
1 – 8
PC 104
CPU Card
Disk On
Module
Flash Chip
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)
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
Sensor Status & Control
Optical
Bench
RELAY
BOARD
IR
Source
Photo-
detector
SYNC
DEMOD
CO
2
M
E
A
S
CO
2
R
E
F
CPU Status
LED
Schmidt
Trigger
PUMP
A4
Optional
O
2
Sensor
O
2
SENSOR
TEMP
(optional)
COM2
Female
RS232
Male
Ethernet
USB COM
port
(
I
2
C Bus
)
Analog In
COM 2
(RS–232 or RS–485)
or USB)
Display
LVDS
transmitter board
USB
Touchscreen
Figure 9-9: GFC 7000TA Electronic Block Diagram