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Teledyne API T802 Paramagnetic O
TEST CHANNEL OUTPUT
CO
(optional)
2
O
Range 2
2
O
Range 1
2
Flow/Pressure Sensor PCA
Sample Pressure
Sensor
Sample Flow
Sensor
O
2
Concentration
O
Sensor
2
O
Temperature
Optional CO
CO
2
Temperature
Sensor
12.5.2. ELECTRONIC OPERATION OF THE CO
07275B DCN6418
Analyzer Operation Manual
2
Finally, the CPU issues commands via a series of relays and switches (also over
2
the I
C bus) located on a separate printed circuit assembly to control the function
of key electromechanical devices such as heaters..
Analog Outputs
Aout 4
Aout 3
Aout 2
Aout 1
Analog Outputs
A/D
Converter
Box
Temperature
Thermistor Interface
Sensor
2
Sensor
2
BOX
Temperature
(Optionl)
Figure 12-7:
T802 Electronic Block Diagram
The CO
PCA is powered by 12 VDC from the analyzer via the relay card, which
2
outputs a 0-5 VDC analog signal to the analyzer's CPU via the motherboard that
corresponds to the concentration of CO
ANALOG
IN
Status
Control
Outputs
Outputs
1 - 8
1 – 6
Optional
Current
Loop
Outputs
External Digital I/O
(D/A)
Power Up
Internal
2
I
C Bus
Digital I/O
O
Cell
2
Heater
2
measured by the probe.
2
Principles of Operation
RS232
COM2
USB COM
Male
Female
port
2
(I
C Bus)
Circuit
CPU
Status
LED
MOTHERBOARD
RELAY PCA
2
I
C
Status
LED
Optional CO
Sensor Heater
SENSOR
Ethernet
Touchscreen
Display
LVDS
transmitter board
PC 104
CPU Card
Disk on
Module
Flash
Chip
2
227
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