Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 216)

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
S
en
sor
S
tat
us
&
C
on
tro
l
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
(R
S
–
23
2
or
R
S
–48
5)
or
U
S
B
)
Display
LVDS
transmitter board
US
B
Touchscreen
Figure 9-9: GFC 7000TA Electronic Block Diagram